Day 4

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@alloca.h

@@ -0,0 +1,40 @@
+/* Copyright (C) 1992-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef	_ALLOCA_H
+#define	_ALLOCA_H	1
+
+#include <features.h>
+
+#define	__need_size_t
+#include <stddef.h>
+
+__BEGIN_DECLS
+
+/* Remove any previous definitions.  */
+#undef	alloca
+
+/* Allocate a block that will be freed when the calling function exits.  */
+extern void *alloca (size_t __size) __THROW;
+
+#ifdef	__GNUC__
+# define alloca(size)	__builtin_alloca (size)
+#endif /* GCC.  */
+
+__END_DECLS
+
+#endif /* alloca.h */

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@byteswap.h

@@ -0,0 +1,79 @@
+/* Macros and inline functions to swap the order of bytes in integer values.
+   Copyright (C) 1997-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#if !defined _BYTESWAP_H && !defined _NETINET_IN_H && !defined _ENDIAN_H
+# error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead."
+#endif
+
+#ifndef _BITS_BYTESWAP_H
+#define _BITS_BYTESWAP_H 1
+
+#include <features.h>
+#include <bits/types.h>
+
+/* Swap bytes in 16-bit value.  */
+#define __bswap_constant_16(x)					\
+  ((__uint16_t) ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8)))
+
+static __inline __uint16_t
+__bswap_16 (__uint16_t __bsx)
+{
+#if __GNUC_PREREQ (4, 8)
+  return __builtin_bswap16 (__bsx);
+#else
+  return __bswap_constant_16 (__bsx);
+#endif
+}
+
+/* Swap bytes in 32-bit value.  */
+#define __bswap_constant_32(x)					\
+  ((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >> 8)	\
+   | (((x) & 0x0000ff00u) << 8) | (((x) & 0x000000ffu) << 24))
+
+static __inline __uint32_t
+__bswap_32 (__uint32_t __bsx)
+{
+#if __GNUC_PREREQ (4, 3)
+  return __builtin_bswap32 (__bsx);
+#else
+  return __bswap_constant_32 (__bsx);
+#endif
+}
+
+/* Swap bytes in 64-bit value.  */
+#define __bswap_constant_64(x)			\
+  ((((x) & 0xff00000000000000ull) >> 56)	\
+   | (((x) & 0x00ff000000000000ull) >> 40)	\
+   | (((x) & 0x0000ff0000000000ull) >> 24)	\
+   | (((x) & 0x000000ff00000000ull) >> 8)	\
+   | (((x) & 0x00000000ff000000ull) << 8)	\
+   | (((x) & 0x0000000000ff0000ull) << 24)	\
+   | (((x) & 0x000000000000ff00ull) << 40)	\
+   | (((x) & 0x00000000000000ffull) << 56))
+
+__extension__ static __inline __uint64_t
+__bswap_64 (__uint64_t __bsx)
+{
+#if __GNUC_PREREQ (4, 3)
+  return __builtin_bswap64 (__bsx);
+#else
+  return __bswap_constant_64 (__bsx);
+#endif
+}
+
+#endif /* _BITS_BYTESWAP_H */

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@endian.h

@@ -0,0 +1,7 @@
+/* i386/x86_64 are little-endian.  */
+
+#ifndef _ENDIAN_H
+# error "Never use <bits/endian.h> directly; include <endian.h> instead."
+#endif
+
+#define __BYTE_ORDER __LITTLE_ENDIAN

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@floatn-common.h

@@ -0,0 +1,329 @@
+/* Macros to control TS 18661-3 glibc features where the same
+   definitions are appropriate for all platforms.
+   Copyright (C) 2017-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _BITS_FLOATN_COMMON_H
+#define _BITS_FLOATN_COMMON_H
+
+#include <features.h>
+#include <bits/long-double.h>
+
+/* This header should be included at the bottom of each bits/floatn.h.
+   It defines the following macros for each _FloatN and _FloatNx type,
+   where the same definitions, or definitions based only on the macros
+   in bits/floatn.h, are appropriate for all glibc configurations.  */
+
+/* Defined to 1 if the current compiler invocation provides a
+   floating-point type with the right format for this type, and this
+   glibc includes corresponding *fN or *fNx interfaces for it.  */
+#define __HAVE_FLOAT16 0
+#define __HAVE_FLOAT32 1
+#define __HAVE_FLOAT64 1
+#define __HAVE_FLOAT32X 1
+#define __HAVE_FLOAT128X 0
+
+/* Defined to 1 if the corresponding __HAVE_<type> macro is 1 and the
+   type is the first with its format in the sequence of (the default
+   choices for) float, double, long double, _Float16, _Float32,
+   _Float64, _Float128, _Float32x, _Float64x, _Float128x for this
+   glibc; that is, if functions present once per floating-point format
+   rather than once per type are present for this type.
+
+   All configurations supported by glibc have _Float32 the same format
+   as float, _Float64 and _Float32x the same format as double, the
+   _Float64x the same format as either long double or _Float128.  No
+   configurations support _Float128x or, as of GCC 7, have compiler
+   support for a type meeting the requirements for _Float128x.  */
+#define __HAVE_DISTINCT_FLOAT16 __HAVE_FLOAT16
+#define __HAVE_DISTINCT_FLOAT32 0
+#define __HAVE_DISTINCT_FLOAT64 0
+#define __HAVE_DISTINCT_FLOAT32X 0
+#define __HAVE_DISTINCT_FLOAT64X 0
+#define __HAVE_DISTINCT_FLOAT128X __HAVE_FLOAT128X
+
+/* Defined to 1 if the corresponding _FloatN type is not binary compatible
+   with the corresponding ISO C type in the current compilation unit as
+   opposed to __HAVE_DISTINCT_FLOATN, which indicates the default types built
+   in glibc.  */
+#define __HAVE_FLOAT128_UNLIKE_LDBL (__HAVE_DISTINCT_FLOAT128	\
+				     && __LDBL_MANT_DIG__ != 113)
+
+/* Defined to 1 if any _FloatN or _FloatNx types that are not
+   ABI-distinct are however distinct types at the C language level (so
+   for the purposes of __builtin_types_compatible_p and _Generic).  */
+#if __GNUC_PREREQ (7, 0) && !defined __cplusplus
+# define __HAVE_FLOATN_NOT_TYPEDEF 1
+#else
+# define __HAVE_FLOATN_NOT_TYPEDEF 0
+#endif
+
+#ifndef __ASSEMBLER__
+
+/* Defined to concatenate the literal suffix to be used with _FloatN
+   or _FloatNx types, if __HAVE_<type> is 1.  The corresponding
+   literal suffixes exist since GCC 7, for C only.  */
+# if __HAVE_FLOAT16
+#  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+/* No corresponding suffix available for this type.  */
+#   define __f16(x) ((_Float16) x##f)
+#  else
+#   define __f16(x) x##f16
+#  endif
+# endif
+
+# if __HAVE_FLOAT32
+#  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+#   define __f32(x) x##f
+#  else
+#   define __f32(x) x##f32
+#  endif
+# endif
+
+# if __HAVE_FLOAT64
+#  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+#   ifdef __NO_LONG_DOUBLE_MATH
+#    define __f64(x) x##l
+#   else
+#    define __f64(x) x
+#   endif
+#  else
+#   define __f64(x) x##f64
+#  endif
+# endif
+
+# if __HAVE_FLOAT32X
+#  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+#   define __f32x(x) x
+#  else
+#   define __f32x(x) x##f32x
+#  endif
+# endif
+
+# if __HAVE_FLOAT64X
+#  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+#   if __HAVE_FLOAT64X_LONG_DOUBLE
+#    define __f64x(x) x##l
+#   else
+#    define __f64x(x) __f128 (x)
+#   endif
+#  else
+#   define __f64x(x) x##f64x
+#  endif
+# endif
+
+# if __HAVE_FLOAT128X
+#  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+#   error "_Float128X supported but no constant suffix"
+#  else
+#   define __f128x(x) x##f128x
+#  endif
+# endif
+
+/* Defined to a complex type if __HAVE_<type> is 1.  */
+# if __HAVE_FLOAT16
+#  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+typedef _Complex float __cfloat16 __attribute__ ((__mode__ (__HC__)));
+#   define __CFLOAT16 __cfloat16
+#  else
+#   define __CFLOAT16 _Complex _Float16
+#  endif
+# endif
+
+# if __HAVE_FLOAT32
+#  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+#   define __CFLOAT32 _Complex float
+#  else
+#   define __CFLOAT32 _Complex _Float32
+#  endif
+# endif
+
+# if __HAVE_FLOAT64
+#  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+#   ifdef __NO_LONG_DOUBLE_MATH
+#    define __CFLOAT64 _Complex long double
+#   else
+#    define __CFLOAT64 _Complex double
+#   endif
+#  else
+#   define __CFLOAT64 _Complex _Float64
+#  endif
+# endif
+
+# if __HAVE_FLOAT32X
+#  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+#   define __CFLOAT32X _Complex double
+#  else
+#   define __CFLOAT32X _Complex _Float32x
+#  endif
+# endif
+
+# if __HAVE_FLOAT64X
+#  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+#   if __HAVE_FLOAT64X_LONG_DOUBLE
+#    define __CFLOAT64X _Complex long double
+#   else
+#    define __CFLOAT64X __CFLOAT128
+#   endif
+#  else
+#   define __CFLOAT64X _Complex _Float64x
+#  endif
+# endif
+
+# if __HAVE_FLOAT128X
+#  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+#   error "_Float128X supported but no complex type"
+#  else
+#   define __CFLOAT128X _Complex _Float128x
+#  endif
+# endif
+
+/* The remaining of this file provides support for older compilers.  */
+# if __HAVE_FLOAT16
+
+#  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+typedef float _Float16 __attribute__ ((__mode__ (__HF__)));
+#  endif
+
+#  if !__GNUC_PREREQ (7, 0)
+#   define __builtin_huge_valf16() ((_Float16) __builtin_huge_val ())
+#   define __builtin_inff16() ((_Float16) __builtin_inf ())
+#   define __builtin_nanf16(x) ((_Float16) __builtin_nan (x))
+#   define __builtin_nansf16(x) ((_Float16) __builtin_nans (x))
+#  endif
+
+# endif
+
+# if __HAVE_FLOAT32
+
+#  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+typedef float _Float32;
+#  endif
+
+#  if !__GNUC_PREREQ (7, 0)
+#   define __builtin_huge_valf32() (__builtin_huge_valf ())
+#   define __builtin_inff32() (__builtin_inff ())
+#   define __builtin_nanf32(x) (__builtin_nanf (x))
+#   define __builtin_nansf32(x) (__builtin_nansf (x))
+#  endif
+
+# endif
+
+# if __HAVE_FLOAT64
+
+/* If double, long double and _Float64 all have the same set of
+   values, TS 18661-3 requires the usual arithmetic conversions on
+   long double and _Float64 to produce _Float64.  For this to be the
+   case when building with a compiler without a distinct _Float64
+   type, _Float64 must be a typedef for long double, not for
+   double.  */
+
+#  ifdef __NO_LONG_DOUBLE_MATH
+
+#   if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+typedef long double _Float64;
+#   endif
+
+#   if !__GNUC_PREREQ (7, 0)
+#    define __builtin_huge_valf64() (__builtin_huge_vall ())
+#    define __builtin_inff64() (__builtin_infl ())
+#    define __builtin_nanf64(x) (__builtin_nanl (x))
+#    define __builtin_nansf64(x) (__builtin_nansl (x))
+#   endif
+
+#  else
+
+#   if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+typedef double _Float64;
+#   endif
+
+#   if !__GNUC_PREREQ (7, 0)
+#    define __builtin_huge_valf64() (__builtin_huge_val ())
+#    define __builtin_inff64() (__builtin_inf ())
+#    define __builtin_nanf64(x) (__builtin_nan (x))
+#    define __builtin_nansf64(x) (__builtin_nans (x))
+#   endif
+
+#  endif
+
+# endif
+
+# if __HAVE_FLOAT32X
+
+#  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+typedef double _Float32x;
+#  endif
+
+#  if !__GNUC_PREREQ (7, 0)
+#   define __builtin_huge_valf32x() (__builtin_huge_val ())
+#   define __builtin_inff32x() (__builtin_inf ())
+#   define __builtin_nanf32x(x) (__builtin_nan (x))
+#   define __builtin_nansf32x(x) (__builtin_nans (x))
+#  endif
+
+# endif
+
+# if __HAVE_FLOAT64X
+
+#  if __HAVE_FLOAT64X_LONG_DOUBLE
+
+#   if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+typedef long double _Float64x;
+#   endif
+
+#   if !__GNUC_PREREQ (7, 0)
+#    define __builtin_huge_valf64x() (__builtin_huge_vall ())
+#    define __builtin_inff64x() (__builtin_infl ())
+#    define __builtin_nanf64x(x) (__builtin_nanl (x))
+#    define __builtin_nansf64x(x) (__builtin_nansl (x))
+#   endif
+
+#  else
+
+#   if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+typedef _Float128 _Float64x;
+#   endif
+
+#   if !__GNUC_PREREQ (7, 0)
+#    define __builtin_huge_valf64x() (__builtin_huge_valf128 ())
+#    define __builtin_inff64x() (__builtin_inff128 ())
+#    define __builtin_nanf64x(x) (__builtin_nanf128 (x))
+#    define __builtin_nansf64x(x) (__builtin_nansf128 (x))
+#   endif
+
+#  endif
+
+# endif
+
+# if __HAVE_FLOAT128X
+
+#  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+#   error "_Float128x supported but no type"
+#  endif
+
+#  if !__GNUC_PREREQ (7, 0)
+#   define __builtin_huge_valf128x() ((_Float128x) __builtin_huge_val ())
+#   define __builtin_inff128x() ((_Float128x) __builtin_inf ())
+#   define __builtin_nanf128x(x) ((_Float128x) __builtin_nan (x))
+#   define __builtin_nansf128x(x) ((_Float128x) __builtin_nans (x))
+#  endif
+
+# endif
+
+#endif /* !__ASSEMBLER__.  */
+
+#endif /* _BITS_FLOATN_COMMON_H */

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@floatn.h

@@ -0,0 +1,121 @@
+/* Macros to control TS 18661-3 glibc features on x86.
+   Copyright (C) 2017-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _BITS_FLOATN_H
+#define _BITS_FLOATN_H
+
+#include <features.h>
+
+/* Defined to 1 if the current compiler invocation provides a
+   floating-point type with the IEEE 754 binary128 format, and this
+   glibc includes corresponding *f128 interfaces for it.  The required
+   libgcc support was added some time after the basic compiler
+   support, for x86_64 and x86.  */
+#if (defined __x86_64__							\
+     ? __GNUC_PREREQ (4, 3)						\
+     : (defined __GNU__ ? __GNUC_PREREQ (4, 5) : __GNUC_PREREQ (4, 4)))
+# define __HAVE_FLOAT128 1
+#else
+# define __HAVE_FLOAT128 0
+#endif
+
+/* Defined to 1 if __HAVE_FLOAT128 is 1 and the type is ABI-distinct
+   from the default float, double and long double types in this glibc.  */
+#if __HAVE_FLOAT128
+# define __HAVE_DISTINCT_FLOAT128 1
+#else
+# define __HAVE_DISTINCT_FLOAT128 0
+#endif
+
+/* Defined to 1 if the current compiler invocation provides a
+   floating-point type with the right format for _Float64x, and this
+   glibc includes corresponding *f64x interfaces for it.  */
+#define __HAVE_FLOAT64X 1
+
+/* Defined to 1 if __HAVE_FLOAT64X is 1 and _Float64x has the format
+   of long double.  Otherwise, if __HAVE_FLOAT64X is 1, _Float64x has
+   the format of _Float128, which must be different from that of long
+   double.  */
+#define __HAVE_FLOAT64X_LONG_DOUBLE 1
+
+#ifndef __ASSEMBLER__
+
+/* Defined to concatenate the literal suffix to be used with _Float128
+   types, if __HAVE_FLOAT128 is 1. */
+# if __HAVE_FLOAT128
+#  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+/* The literal suffix f128 exists only since GCC 7.0.  */
+#   define __f128(x) x##q
+#  else
+#   define __f128(x) x##f128
+#  endif
+# endif
+
+/* Defined to a complex binary128 type if __HAVE_FLOAT128 is 1.  */
+# if __HAVE_FLOAT128
+#  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+/* Add a typedef for older GCC compilers which don't natively support
+   _Complex _Float128.  */
+typedef _Complex float __cfloat128 __attribute__ ((__mode__ (__TC__)));
+#   define __CFLOAT128 __cfloat128
+#  else
+#   define __CFLOAT128 _Complex _Float128
+#  endif
+# endif
+
+/* The remaining of this file provides support for older compilers.  */
+# if __HAVE_FLOAT128
+
+/* The type _Float128 exists only since GCC 7.0.  */
+#  if !__GNUC_PREREQ (7, 0) || defined __cplusplus
+typedef __float128 _Float128;
+#  endif
+
+/* __builtin_huge_valf128 doesn't exist before GCC 7.0.  */
+#  if !__GNUC_PREREQ (7, 0)
+#   define __builtin_huge_valf128() ((_Float128) __builtin_huge_val ())
+#  endif
+
+/* Older GCC has only a subset of built-in functions for _Float128 on
+   x86, and __builtin_infq is not usable in static initializers.
+   Converting a narrower sNaN to _Float128 produces a quiet NaN, so
+   attempts to use _Float128 sNaNs will not work properly with older
+   compilers.  */
+#  if !__GNUC_PREREQ (7, 0)
+#   define __builtin_copysignf128 __builtin_copysignq
+#   define __builtin_fabsf128 __builtin_fabsq
+#   define __builtin_inff128() ((_Float128) __builtin_inf ())
+#   define __builtin_nanf128(x) ((_Float128) __builtin_nan (x))
+#   define __builtin_nansf128(x) ((_Float128) __builtin_nans (x))
+#  endif
+
+/* In math/math.h, __MATH_TG will expand signbit to __builtin_signbit*,
+   e.g.: __builtin_signbitf128, before GCC 6.  However, there has never
+   been a __builtin_signbitf128 in GCC and the type-generic builtin is
+   only available since GCC 6.  */
+#  if !__GNUC_PREREQ (6, 0)
+#   define __builtin_signbitf128 __signbitf128
+#  endif
+
+# endif
+
+#endif /* !__ASSEMBLER__.  */
+
+#include <bits/floatn-common.h>
+
+#endif /* _BITS_FLOATN_H */

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@libc-header-start.h

@@ -0,0 +1,70 @@
+/* Handle feature test macros at the start of a header.
+   Copyright (C) 2016-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* This header is internal to glibc and should not be included outside
+   of glibc headers.  Headers including it must define
+   __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION first.  This header
+   cannot have multiple include guards because ISO C feature test
+   macros depend on the definition of the macro when an affected
+   header is included, not when the first system header is
+   included.  */
+
+#ifndef __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION
+# error "Never include <bits/libc-header-start.h> directly."
+#endif
+
+#undef __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION
+
+#include <features.h>
+
+/* ISO/IEC TR 24731-2:2010 defines the __STDC_WANT_LIB_EXT2__
+   macro.  */
+#undef __GLIBC_USE_LIB_EXT2
+#if (defined __USE_GNU							\
+     || (defined __STDC_WANT_LIB_EXT2__ && __STDC_WANT_LIB_EXT2__ > 0))
+# define __GLIBC_USE_LIB_EXT2 1
+#else
+# define __GLIBC_USE_LIB_EXT2 0
+#endif
+
+/* ISO/IEC TS 18661-1:2014 defines the __STDC_WANT_IEC_60559_BFP_EXT__
+   macro.  */
+#undef __GLIBC_USE_IEC_60559_BFP_EXT
+#if defined __USE_GNU || defined __STDC_WANT_IEC_60559_BFP_EXT__
+# define __GLIBC_USE_IEC_60559_BFP_EXT 1
+#else
+# define __GLIBC_USE_IEC_60559_BFP_EXT 0
+#endif
+
+/* ISO/IEC TS 18661-4:2015 defines the
+   __STDC_WANT_IEC_60559_FUNCS_EXT__ macro.  */
+#undef __GLIBC_USE_IEC_60559_FUNCS_EXT
+#if defined __USE_GNU || defined __STDC_WANT_IEC_60559_FUNCS_EXT__
+# define __GLIBC_USE_IEC_60559_FUNCS_EXT 1
+#else
+# define __GLIBC_USE_IEC_60559_FUNCS_EXT 0
+#endif
+
+/* ISO/IEC TS 18661-3:2015 defines the
+   __STDC_WANT_IEC_60559_TYPES_EXT__ macro.  */
+#undef __GLIBC_USE_IEC_60559_TYPES_EXT
+#if defined __USE_GNU || defined __STDC_WANT_IEC_60559_TYPES_EXT__
+# define __GLIBC_USE_IEC_60559_TYPES_EXT 1
+#else
+# define __GLIBC_USE_IEC_60559_TYPES_EXT 0
+#endif

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@long-double.h

@@ -0,0 +1,20 @@
+/* Properties of long double type.  ldbl-96 version.
+   Copyright (C) 2016-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License  published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* long double is distinct from double, so there is nothing to
+   define here.  */

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@pthreadtypes-arch.h

@@ -0,0 +1,106 @@
+/* Copyright (C) 2002-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _BITS_PTHREADTYPES_ARCH_H
+#define _BITS_PTHREADTYPES_ARCH_H	1
+
+#include <bits/wordsize.h>
+
+#ifdef __x86_64__
+# if __WORDSIZE == 64
+#  define __SIZEOF_PTHREAD_MUTEX_T 40
+#  define __SIZEOF_PTHREAD_ATTR_T 56
+#  define __SIZEOF_PTHREAD_MUTEX_T 40
+#  define __SIZEOF_PTHREAD_RWLOCK_T 56
+#  define __SIZEOF_PTHREAD_BARRIER_T 32
+# else
+#  define __SIZEOF_PTHREAD_MUTEX_T 32
+#  define __SIZEOF_PTHREAD_ATTR_T 32
+#  define __SIZEOF_PTHREAD_MUTEX_T 32
+#  define __SIZEOF_PTHREAD_RWLOCK_T 44
+#  define __SIZEOF_PTHREAD_BARRIER_T 20
+# endif
+#else
+# define __SIZEOF_PTHREAD_MUTEX_T 24
+# define __SIZEOF_PTHREAD_ATTR_T 36
+# define __SIZEOF_PTHREAD_MUTEX_T 24
+# define __SIZEOF_PTHREAD_RWLOCK_T 32
+# define __SIZEOF_PTHREAD_BARRIER_T 20
+#endif
+#define __SIZEOF_PTHREAD_MUTEXATTR_T 4
+#define __SIZEOF_PTHREAD_COND_T 48
+#define __SIZEOF_PTHREAD_CONDATTR_T 4
+#define __SIZEOF_PTHREAD_RWLOCKATTR_T 8
+#define __SIZEOF_PTHREAD_BARRIERATTR_T 4
+
+/* Definitions for internal mutex struct.  */
+#define __PTHREAD_COMPAT_PADDING_MID
+#define __PTHREAD_COMPAT_PADDING_END
+#define __PTHREAD_MUTEX_LOCK_ELISION    1
+#ifdef __x86_64__
+# define __PTHREAD_MUTEX_NUSERS_AFTER_KIND  0
+# define __PTHREAD_MUTEX_USE_UNION          0
+#else
+# define __PTHREAD_MUTEX_NUSERS_AFTER_KIND  1
+# define __PTHREAD_MUTEX_USE_UNION          1
+#endif
+
+#define __LOCK_ALIGNMENT
+#define __ONCE_ALIGNMENT
+
+struct __pthread_rwlock_arch_t
+{
+  unsigned int __readers;
+  unsigned int __writers;
+  unsigned int __wrphase_futex;
+  unsigned int __writers_futex;
+  unsigned int __pad3;
+  unsigned int __pad4;
+#ifdef __x86_64__
+  int __cur_writer;
+  int __shared;
+  signed char __rwelision;
+# ifdef  __ILP32__
+  unsigned char __pad1[3];
+#  define __PTHREAD_RWLOCK_ELISION_EXTRA 0, { 0, 0, 0 }
+# else
+  unsigned char __pad1[7];
+#  define __PTHREAD_RWLOCK_ELISION_EXTRA 0, { 0, 0, 0, 0, 0, 0, 0 }
+# endif
+  unsigned long int __pad2;
+  /* FLAGS must stay at this position in the structure to maintain
+     binary compatibility.  */
+  unsigned int __flags;
+# define __PTHREAD_RWLOCK_INT_FLAGS_SHARED	1
+#else
+  /* FLAGS must stay at this position in the structure to maintain
+     binary compatibility.  */
+  unsigned char __flags;
+  unsigned char __shared;
+  signed char __rwelision;
+# define __PTHREAD_RWLOCK_ELISION_EXTRA 0
+  unsigned char __pad2;
+  int __cur_writer;
+#endif
+};
+
+#ifndef __x86_64__
+/* Extra attributes for the cleanup functions.  */
+# define __cleanup_fct_attribute __attribute__ ((__regparm__ (1)))
+#endif
+
+#endif	/* bits/pthreadtypes.h */

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@pthreadtypes.h

@@ -0,0 +1,121 @@
+/* Declaration of common pthread types for all architectures.
+   Copyright (C) 2017-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _BITS_PTHREADTYPES_COMMON_H
+# define _BITS_PTHREADTYPES_COMMON_H	1
+
+/* For internal mutex and condition variable definitions.  */
+#include <bits/thread-shared-types.h>
+
+/* Thread identifiers.  The structure of the attribute type is not
+   exposed on purpose.  */
+typedef unsigned long int pthread_t;
+
+
+/* Data structures for mutex handling.  The structure of the attribute
+   type is not exposed on purpose.  */
+typedef union
+{
+  char __size[__SIZEOF_PTHREAD_MUTEXATTR_T];
+  int __align;
+} pthread_mutexattr_t;
+
+
+/* Data structure for condition variable handling.  The structure of
+   the attribute type is not exposed on purpose.  */
+typedef union
+{
+  char __size[__SIZEOF_PTHREAD_CONDATTR_T];
+  int __align;
+} pthread_condattr_t;
+
+
+/* Keys for thread-specific data */
+typedef unsigned int pthread_key_t;
+
+
+/* Once-only execution */
+typedef int __ONCE_ALIGNMENT pthread_once_t;
+
+
+union pthread_attr_t
+{
+  char __size[__SIZEOF_PTHREAD_ATTR_T];
+  long int __align;
+};
+#ifndef __have_pthread_attr_t
+typedef union pthread_attr_t pthread_attr_t;
+# define __have_pthread_attr_t 1
+#endif
+
+
+typedef union
+{
+  struct __pthread_mutex_s __data;
+  char __size[__SIZEOF_PTHREAD_MUTEX_T];
+  long int __align;
+} pthread_mutex_t;
+
+
+typedef union
+{
+  struct __pthread_cond_s __data;
+  char __size[__SIZEOF_PTHREAD_COND_T];
+  __extension__ long long int __align;
+} pthread_cond_t;
+
+
+#if defined __USE_UNIX98 || defined __USE_XOPEN2K
+/* Data structure for reader-writer lock variable handling.  The
+   structure of the attribute type is deliberately not exposed.  */
+typedef union
+{
+  struct __pthread_rwlock_arch_t __data;
+  char __size[__SIZEOF_PTHREAD_RWLOCK_T];
+  long int __align;
+} pthread_rwlock_t;
+
+typedef union
+{
+  char __size[__SIZEOF_PTHREAD_RWLOCKATTR_T];
+  long int __align;
+} pthread_rwlockattr_t;
+#endif
+
+
+#ifdef __USE_XOPEN2K
+/* POSIX spinlock data type.  */
+typedef volatile int pthread_spinlock_t;
+
+
+/* POSIX barriers data type.  The structure of the type is
+   deliberately not exposed.  */
+typedef union
+{
+  char __size[__SIZEOF_PTHREAD_BARRIER_T];
+  long int __align;
+} pthread_barrier_t;
+
+typedef union
+{
+  char __size[__SIZEOF_PTHREAD_BARRIERATTR_T];
+  int __align;
+} pthread_barrierattr_t;
+#endif
+
+#endif

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@select.h

@@ -0,0 +1,63 @@
+/* Copyright (C) 1997-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _SYS_SELECT_H
+# error "Never use <bits/select.h> directly; include <sys/select.h> instead."
+#endif
+
+#include <bits/wordsize.h>
+
+
+#if defined __GNUC__ && __GNUC__ >= 2
+
+# if __WORDSIZE == 64
+#  define __FD_ZERO_STOS "stosq"
+# else
+#  define __FD_ZERO_STOS "stosl"
+# endif
+
+# define __FD_ZERO(fdsp) \
+  do {									      \
+    int __d0, __d1;							      \
+    __asm__ __volatile__ ("cld; rep; " __FD_ZERO_STOS			      \
+			  : "=c" (__d0), "=D" (__d1)			      \
+			  : "a" (0), "0" (sizeof (fd_set)		      \
+					  / sizeof (__fd_mask)),	      \
+			    "1" (&__FDS_BITS (fdsp)[0])			      \
+			  : "memory");					      \
+  } while (0)
+
+#else	/* ! GNU CC */
+
+/* We don't use `memset' because this would require a prototype and
+   the array isn't too big.  */
+# define __FD_ZERO(set)  \
+  do {									      \
+    unsigned int __i;							      \
+    fd_set *__arr = (set);						      \
+    for (__i = 0; __i < sizeof (fd_set) / sizeof (__fd_mask); ++__i)	      \
+      __FDS_BITS (__arr)[__i] = 0;					      \
+  } while (0)
+
+#endif	/* GNU CC */
+
+#define __FD_SET(d, set) \
+  ((void) (__FDS_BITS (set)[__FD_ELT (d)] |= __FD_MASK (d)))
+#define __FD_CLR(d, set) \
+  ((void) (__FDS_BITS (set)[__FD_ELT (d)] &= ~__FD_MASK (d)))
+#define __FD_ISSET(d, set) \
+  ((__FDS_BITS (set)[__FD_ELT (d)] & __FD_MASK (d)) != 0)

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@stdint-intn.h

@@ -0,0 +1,29 @@
+/* Define intN_t types.
+   Copyright (C) 2017-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _BITS_STDINT_INTN_H
+#define _BITS_STDINT_INTN_H	1
+
+#include <bits/types.h>
+
+typedef __int8_t int8_t;
+typedef __int16_t int16_t;
+typedef __int32_t int32_t;
+typedef __int64_t int64_t;
+
+#endif /* bits/stdint-intn.h */

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@stdio_lim.h

@@ -0,0 +1,39 @@
+/* Copyright (C) 1994-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _BITS_STDIO_LIM_H
+#define _BITS_STDIO_LIM_H 1
+
+#ifndef _STDIO_H
+# error "Never include <bits/stdio_lim.h> directly; use <stdio.h> instead."
+#endif
+
+#define L_tmpnam 20
+#define TMP_MAX 238328
+#define FILENAME_MAX 4096
+
+#ifdef __USE_POSIX
+# define L_ctermid 9
+# if !defined __USE_XOPEN2K || defined __USE_GNU
+#  define L_cuserid 9
+# endif
+#endif
+
+#undef  FOPEN_MAX
+#define FOPEN_MAX 16
+
+#endif /* bits/stdio_lim.h */

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@stdlib-float.h

@@ -0,0 +1,29 @@
+/* Floating-point inline functions for stdlib.h.
+   Copyright (C) 2012-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _STDLIB_H
+# error "Never use <bits/stdlib-float.h> directly; include <stdlib.h> instead."
+#endif
+
+#ifdef __USE_EXTERN_INLINES
+__extern_inline double
+__NTH (atof (const char *__nptr))
+{
+  return strtod (__nptr, (char **) NULL);
+}
+#endif /* Optimizing and Inlining.  */

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@sys_errlist.h

@@ -0,0 +1,32 @@
+/* Declare sys_errlist and sys_nerr, or don't.  Compatibility (do) version.
+   Copyright (C) 2002-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _STDIO_H
+# error "Never include <bits/sys_errlist.h> directly; use <stdio.h> instead."
+#endif
+
+/* sys_errlist and sys_nerr are deprecated.  Use strerror instead.  */
+
+#ifdef  __USE_MISC
+extern int sys_nerr;
+extern const char *const sys_errlist[];
+#endif
+#ifdef  __USE_GNU
+extern int _sys_nerr;
+extern const char *const _sys_errlist[];
+#endif

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@thread-shared-types.h

@@ -0,0 +1,198 @@
+/* Common threading primitives definitions for both POSIX and C11.
+   Copyright (C) 2017-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _THREAD_SHARED_TYPES_H
+#define _THREAD_SHARED_TYPES_H 1
+
+/* Arch-specific definitions.  Each architecture must define the following
+   macros to define the expected sizes of pthread data types:
+
+   __SIZEOF_PTHREAD_ATTR_T        - size of pthread_attr_t.
+   __SIZEOF_PTHREAD_MUTEX_T       - size of pthread_mutex_t.
+   __SIZEOF_PTHREAD_MUTEXATTR_T   - size of pthread_mutexattr_t.
+   __SIZEOF_PTHREAD_COND_T        - size of pthread_cond_t.
+   __SIZEOF_PTHREAD_CONDATTR_T    - size of pthread_condattr_t.
+   __SIZEOF_PTHREAD_RWLOCK_T      - size of pthread_rwlock_t.
+   __SIZEOF_PTHREAD_RWLOCKATTR_T  - size of pthread_rwlockattr_t.
+   __SIZEOF_PTHREAD_BARRIER_T     - size of pthread_barrier_t.
+   __SIZEOF_PTHREAD_BARRIERATTR_T - size of pthread_barrierattr_t.
+
+   Also, the following macros must be define for internal pthread_mutex_t
+   struct definitions (struct __pthread_mutex_s):
+
+   __PTHREAD_COMPAT_PADDING_MID   - any additional members after 'kind'
+				    and before '__spin' (for 64 bits) or
+				    '__nusers' (for 32 bits).
+   __PTHREAD_COMPAT_PADDING_END   - any additional members at the end of
+				    the internal structure.
+   __PTHREAD_MUTEX_LOCK_ELISION   - 1 if the architecture supports lock
+				    elision or 0 otherwise.
+   __PTHREAD_MUTEX_NUSERS_AFTER_KIND - control where to put __nusers.  The
+				       preferred value for new architectures
+				       is 0.
+   __PTHREAD_MUTEX_USE_UNION      - control whether internal __spins and
+				    __list will be place inside a union for
+				    linuxthreads compatibility.
+				    The preferred value for new architectures
+				    is 0.
+
+   For a new port the preferred values for the required defines are:
+
+   #define __PTHREAD_COMPAT_PADDING_MID
+   #define __PTHREAD_COMPAT_PADDING_END
+   #define __PTHREAD_MUTEX_LOCK_ELISION         0
+   #define __PTHREAD_MUTEX_NUSERS_AFTER_KIND    0
+   #define __PTHREAD_MUTEX_USE_UNION            0
+
+   __PTHREAD_MUTEX_LOCK_ELISION can be set to 1 if the hardware plans to
+   eventually support lock elision using transactional memory.
+
+   The additional macro defines any constraint for the lock alignment
+   inside the thread structures:
+
+   __LOCK_ALIGNMENT - for internal lock/futex usage.
+
+   Same idea but for the once locking primitive:
+
+   __ONCE_ALIGNMENT - for pthread_once_t/once_flag definition.
+
+   And finally the internal pthread_rwlock_t (struct __pthread_rwlock_arch_t)
+   must be defined.
+ */
+#include <bits/pthreadtypes-arch.h>
+
+/* Common definition of pthread_mutex_t. */
+
+#if !__PTHREAD_MUTEX_USE_UNION
+typedef struct __pthread_internal_list
+{
+  struct __pthread_internal_list *__prev;
+  struct __pthread_internal_list *__next;
+} __pthread_list_t;
+#else
+typedef struct __pthread_internal_slist
+{
+  struct __pthread_internal_slist *__next;
+} __pthread_slist_t;
+#endif
+
+/* Lock elision support.  */
+#if __PTHREAD_MUTEX_LOCK_ELISION
+# if !__PTHREAD_MUTEX_USE_UNION
+#  define __PTHREAD_SPINS_DATA	\
+  short __spins;		\
+  short __elision
+#  define __PTHREAD_SPINS             0, 0
+# else
+#  define __PTHREAD_SPINS_DATA	\
+  struct			\
+  {				\
+    short __espins;		\
+    short __eelision;		\
+  } __elision_data
+#  define __PTHREAD_SPINS         { 0, 0 }
+#  define __spins __elision_data.__espins
+#  define __elision __elision_data.__eelision
+# endif
+#else
+# define __PTHREAD_SPINS_DATA int __spins
+/* Mutex __spins initializer used by PTHREAD_MUTEX_INITIALIZER.  */
+# define __PTHREAD_SPINS 0
+#endif
+
+struct __pthread_mutex_s
+{
+  int __lock __LOCK_ALIGNMENT;
+  unsigned int __count;
+  int __owner;
+#if !__PTHREAD_MUTEX_NUSERS_AFTER_KIND
+  unsigned int __nusers;
+#endif
+  /* KIND must stay at this position in the structure to maintain
+     binary compatibility with static initializers.
+
+     Concurrency notes:
+     The __kind of a mutex is initialized either by the static
+     PTHREAD_MUTEX_INITIALIZER or by a call to pthread_mutex_init.
+
+     After a mutex has been initialized, the __kind of a mutex is usually not
+     changed.  BUT it can be set to -1 in pthread_mutex_destroy or elision can
+     be enabled.  This is done concurrently in the pthread_mutex_*lock functions
+     by using the macro FORCE_ELISION. This macro is only defined for
+     architectures which supports lock elision.
+
+     For elision, there are the flags PTHREAD_MUTEX_ELISION_NP and
+     PTHREAD_MUTEX_NO_ELISION_NP which can be set in addition to the already set
+     type of a mutex.
+     Before a mutex is initialized, only PTHREAD_MUTEX_NO_ELISION_NP can be set
+     with pthread_mutexattr_settype.
+     After a mutex has been initialized, the functions pthread_mutex_*lock can
+     enable elision - if the mutex-type and the machine supports it - by setting
+     the flag PTHREAD_MUTEX_ELISION_NP. This is done concurrently. Afterwards
+     the lock / unlock functions are using specific elision code-paths.  */
+  int __kind;
+  __PTHREAD_COMPAT_PADDING_MID
+#if __PTHREAD_MUTEX_NUSERS_AFTER_KIND
+  unsigned int __nusers;
+#endif
+#if !__PTHREAD_MUTEX_USE_UNION
+  __PTHREAD_SPINS_DATA;
+  __pthread_list_t __list;
+# define __PTHREAD_MUTEX_HAVE_PREV      1
+#else
+  __extension__ union
+  {
+    __PTHREAD_SPINS_DATA;
+    __pthread_slist_t __list;
+  };
+# define __PTHREAD_MUTEX_HAVE_PREV      0
+#endif
+  __PTHREAD_COMPAT_PADDING_END
+};
+
+
+/* Common definition of pthread_cond_t. */
+
+struct __pthread_cond_s
+{
+  __extension__ union
+  {
+    __extension__ unsigned long long int __wseq;
+    struct
+    {
+      unsigned int __low;
+      unsigned int __high;
+    } __wseq32;
+  };
+  __extension__ union
+  {
+    __extension__ unsigned long long int __g1_start;
+    struct
+    {
+      unsigned int __low;
+      unsigned int __high;
+    } __g1_start32;
+  };
+  unsigned int __g_refs[2] __LOCK_ALIGNMENT;
+  unsigned int __g_size[2];
+  unsigned int __g1_orig_size;
+  unsigned int __wrefs;
+  unsigned int __g_signals[2];
+};
+
+#endif /* _THREAD_SHARED_TYPES_H  */

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@time64.h

@@ -0,0 +1,36 @@
+/* bits/time64.h -- underlying types for __time64_t.  Generic version.
+   Copyright (C) 2018-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _BITS_TYPES_H
+# error "Never include <bits/time64.h> directly; use <sys/types.h> instead."
+#endif
+
+#ifndef	_BITS_TIME64_H
+#define	_BITS_TIME64_H	1
+
+/* Define __TIME64_T_TYPE so that it is always a 64-bit type.  */
+
+#if __TIMESIZE == 64
+/* If we already have 64-bit time type then use it.  */
+# define __TIME64_T_TYPE		__TIME_T_TYPE
+#else
+/* Define a 64-bit time type alongsize the 32-bit one.  */
+# define __TIME64_T_TYPE		__SQUAD_TYPE
+#endif
+
+#endif /* bits/time64.h */

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@timesize.h

@@ -0,0 +1,25 @@
+/* Bit size of the time_t type at glibc build time, x86-64 and x32 case.
+   Copyright (C) 2018-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#if defined __x86_64__ && defined __ILP32__
+/* For x32, time is 64-bit even though word size is 32-bit.  */
+# define __TIMESIZE	64
+#else
+/* For others, time size is word size.  */
+# define __TIMESIZE	__WORDSIZE
+#endif

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@types.h

@@ -0,0 +1,224 @@
+/* bits/types.h -- definitions of __*_t types underlying *_t types.
+   Copyright (C) 2002-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/*
+ * Never include this file directly; use <sys/types.h> instead.
+ */
+
+#ifndef	_BITS_TYPES_H
+#define	_BITS_TYPES_H	1
+
+#include <features.h>
+#include <bits/wordsize.h>
+#include <bits/timesize.h>
+
+/* Convenience types.  */
+typedef unsigned char __u_char;
+typedef unsigned short int __u_short;
+typedef unsigned int __u_int;
+typedef unsigned long int __u_long;
+
+/* Fixed-size types, underlying types depend on word size and compiler.  */
+typedef signed char __int8_t;
+typedef unsigned char __uint8_t;
+typedef signed short int __int16_t;
+typedef unsigned short int __uint16_t;
+typedef signed int __int32_t;
+typedef unsigned int __uint32_t;
+#if __WORDSIZE == 64
+typedef signed long int __int64_t;
+typedef unsigned long int __uint64_t;
+#else
+__extension__ typedef signed long long int __int64_t;
+__extension__ typedef unsigned long long int __uint64_t;
+#endif
+
+/* Smallest types with at least a given width.  */
+typedef __int8_t __int_least8_t;
+typedef __uint8_t __uint_least8_t;
+typedef __int16_t __int_least16_t;
+typedef __uint16_t __uint_least16_t;
+typedef __int32_t __int_least32_t;
+typedef __uint32_t __uint_least32_t;
+typedef __int64_t __int_least64_t;
+typedef __uint64_t __uint_least64_t;
+
+/* quad_t is also 64 bits.  */
+#if __WORDSIZE == 64
+typedef long int __quad_t;
+typedef unsigned long int __u_quad_t;
+#else
+__extension__ typedef long long int __quad_t;
+__extension__ typedef unsigned long long int __u_quad_t;
+#endif
+
+/* Largest integral types.  */
+#if __WORDSIZE == 64
+typedef long int __intmax_t;
+typedef unsigned long int __uintmax_t;
+#else
+__extension__ typedef long long int __intmax_t;
+__extension__ typedef unsigned long long int __uintmax_t;
+#endif
+
+
+/* The machine-dependent file <bits/typesizes.h> defines __*_T_TYPE
+   macros for each of the OS types we define below.  The definitions
+   of those macros must use the following macros for underlying types.
+   We define __S<SIZE>_TYPE and __U<SIZE>_TYPE for the signed and unsigned
+   variants of each of the following integer types on this machine.
+
+	16		-- "natural" 16-bit type (always short)
+	32		-- "natural" 32-bit type (always int)
+	64		-- "natural" 64-bit type (long or long long)
+	LONG32		-- 32-bit type, traditionally long
+	QUAD		-- 64-bit type, traditionally long long
+	WORD		-- natural type of __WORDSIZE bits (int or long)
+	LONGWORD	-- type of __WORDSIZE bits, traditionally long
+
+   We distinguish WORD/LONGWORD, 32/LONG32, and 64/QUAD so that the
+   conventional uses of `long' or `long long' type modifiers match the
+   types we define, even when a less-adorned type would be the same size.
+   This matters for (somewhat) portably writing printf/scanf formats for
+   these types, where using the appropriate l or ll format modifiers can
+   make the typedefs and the formats match up across all GNU platforms.  If
+   we used `long' when it's 64 bits where `long long' is expected, then the
+   compiler would warn about the formats not matching the argument types,
+   and the programmer changing them to shut up the compiler would break the
+   program's portability.
+
+   Here we assume what is presently the case in all the GCC configurations
+   we support: long long is always 64 bits, long is always word/address size,
+   and int is always 32 bits.  */
+
+#define	__S16_TYPE		short int
+#define __U16_TYPE		unsigned short int
+#define	__S32_TYPE		int
+#define __U32_TYPE		unsigned int
+#define __SLONGWORD_TYPE	long int
+#define __ULONGWORD_TYPE	unsigned long int
+#if __WORDSIZE == 32
+# define __SQUAD_TYPE		__int64_t
+# define __UQUAD_TYPE		__uint64_t
+# define __SWORD_TYPE		int
+# define __UWORD_TYPE		unsigned int
+# define __SLONG32_TYPE		long int
+# define __ULONG32_TYPE		unsigned long int
+# define __S64_TYPE		__int64_t
+# define __U64_TYPE		__uint64_t
+/* We want __extension__ before typedef's that use nonstandard base types
+   such as `long long' in C89 mode.  */
+# define __STD_TYPE		__extension__ typedef
+#elif __WORDSIZE == 64
+# define __SQUAD_TYPE		long int
+# define __UQUAD_TYPE		unsigned long int
+# define __SWORD_TYPE		long int
+# define __UWORD_TYPE		unsigned long int
+# define __SLONG32_TYPE		int
+# define __ULONG32_TYPE		unsigned int
+# define __S64_TYPE		long int
+# define __U64_TYPE		unsigned long int
+/* No need to mark the typedef with __extension__.   */
+# define __STD_TYPE		typedef
+#else
+# error
+#endif
+#include <bits/typesizes.h>	/* Defines __*_T_TYPE macros.  */
+#include <bits/time64.h>	/* Defines __TIME*_T_TYPE macros.  */
+
+
+__STD_TYPE __DEV_T_TYPE __dev_t;	/* Type of device numbers.  */
+__STD_TYPE __UID_T_TYPE __uid_t;	/* Type of user identifications.  */
+__STD_TYPE __GID_T_TYPE __gid_t;	/* Type of group identifications.  */
+__STD_TYPE __INO_T_TYPE __ino_t;	/* Type of file serial numbers.  */
+__STD_TYPE __INO64_T_TYPE __ino64_t;	/* Type of file serial numbers (LFS).*/
+__STD_TYPE __MODE_T_TYPE __mode_t;	/* Type of file attribute bitmasks.  */
+__STD_TYPE __NLINK_T_TYPE __nlink_t;	/* Type of file link counts.  */
+__STD_TYPE __OFF_T_TYPE __off_t;	/* Type of file sizes and offsets.  */
+__STD_TYPE __OFF64_T_TYPE __off64_t;	/* Type of file sizes and offsets (LFS).  */
+__STD_TYPE __PID_T_TYPE __pid_t;	/* Type of process identifications.  */
+__STD_TYPE __FSID_T_TYPE __fsid_t;	/* Type of file system IDs.  */
+__STD_TYPE __CLOCK_T_TYPE __clock_t;	/* Type of CPU usage counts.  */
+__STD_TYPE __RLIM_T_TYPE __rlim_t;	/* Type for resource measurement.  */
+__STD_TYPE __RLIM64_T_TYPE __rlim64_t;	/* Type for resource measurement (LFS).  */
+__STD_TYPE __ID_T_TYPE __id_t;		/* General type for IDs.  */
+__STD_TYPE __TIME_T_TYPE __time_t;	/* Seconds since the Epoch.  */
+__STD_TYPE __USECONDS_T_TYPE __useconds_t; /* Count of microseconds.  */
+__STD_TYPE __SUSECONDS_T_TYPE __suseconds_t; /* Signed count of microseconds.  */
+
+__STD_TYPE __DADDR_T_TYPE __daddr_t;	/* The type of a disk address.  */
+__STD_TYPE __KEY_T_TYPE __key_t;	/* Type of an IPC key.  */
+
+/* Clock ID used in clock and timer functions.  */
+__STD_TYPE __CLOCKID_T_TYPE __clockid_t;
+
+/* Timer ID returned by `timer_create'.  */
+__STD_TYPE __TIMER_T_TYPE __timer_t;
+
+/* Type to represent block size.  */
+__STD_TYPE __BLKSIZE_T_TYPE __blksize_t;
+
+/* Types from the Large File Support interface.  */
+
+/* Type to count number of disk blocks.  */
+__STD_TYPE __BLKCNT_T_TYPE __blkcnt_t;
+__STD_TYPE __BLKCNT64_T_TYPE __blkcnt64_t;
+
+/* Type to count file system blocks.  */
+__STD_TYPE __FSBLKCNT_T_TYPE __fsblkcnt_t;
+__STD_TYPE __FSBLKCNT64_T_TYPE __fsblkcnt64_t;
+
+/* Type to count file system nodes.  */
+__STD_TYPE __FSFILCNT_T_TYPE __fsfilcnt_t;
+__STD_TYPE __FSFILCNT64_T_TYPE __fsfilcnt64_t;
+
+/* Type of miscellaneous file system fields.  */
+__STD_TYPE __FSWORD_T_TYPE __fsword_t;
+
+__STD_TYPE __SSIZE_T_TYPE __ssize_t; /* Type of a byte count, or error.  */
+
+/* Signed long type used in system calls.  */
+__STD_TYPE __SYSCALL_SLONG_TYPE __syscall_slong_t;
+/* Unsigned long type used in system calls.  */
+__STD_TYPE __SYSCALL_ULONG_TYPE __syscall_ulong_t;
+
+/* These few don't really vary by system, they always correspond
+   to one of the other defined types.  */
+typedef __off64_t __loff_t;	/* Type of file sizes and offsets (LFS).  */
+typedef char *__caddr_t;
+
+/* Duplicates info from stdint.h but this is used in unistd.h.  */
+__STD_TYPE __SWORD_TYPE __intptr_t;
+
+/* Duplicate info from sys/socket.h.  */
+__STD_TYPE __U32_TYPE __socklen_t;
+
+/* C99: An integer type that can be accessed as an atomic entity,
+   even in the presence of asynchronous interrupts.
+   It is not currently necessary for this to be machine-specific.  */
+typedef int __sig_atomic_t;
+
+#if __TIMESIZE == 64
+# define __time64_t __time_t
+#else
+__STD_TYPE __TIME64_T_TYPE __time64_t;	/* Seconds since the Epoch.  */
+#endif
+
+#undef __STD_TYPE
+
+#endif /* bits/types.h */

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@types@FILE.h

@@ -0,0 +1,9 @@
+#ifndef __FILE_defined
+#define __FILE_defined 1
+
+struct _IO_FILE;
+
+/* The opaque type of streams.  This is the definition used elsewhere.  */
+typedef struct _IO_FILE FILE;
+
+#endif

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@types@__FILE.h

@@ -0,0 +1,7 @@
+#ifndef ____FILE_defined
+#define ____FILE_defined 1
+
+struct _IO_FILE;
+typedef struct _IO_FILE __FILE;
+
+#endif

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@types@__fpos64_t.h

@@ -0,0 +1,16 @@
+#ifndef _____fpos64_t_defined
+#define _____fpos64_t_defined 1
+
+#include <bits/types.h>
+#include <bits/types/__mbstate_t.h>
+
+/* The tag name of this struct is _G_fpos64_t to preserve historic
+   C++ mangled names for functions taking fpos_t and/or fpos64_t
+   arguments.  That name should not be used in new code.  */
+typedef struct _G_fpos64_t
+{
+  __off64_t __pos;
+  __mbstate_t __state;
+} __fpos64_t;
+
+#endif

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@types@__fpos_t.h

@@ -0,0 +1,16 @@
+#ifndef _____fpos_t_defined
+#define _____fpos_t_defined 1
+
+#include <bits/types.h>
+#include <bits/types/__mbstate_t.h>
+
+/* The tag name of this struct is _G_fpos_t to preserve historic
+   C++ mangled names for functions taking fpos_t arguments.
+   That name should not be used in new code.  */
+typedef struct _G_fpos_t
+{
+  __off_t __pos;
+  __mbstate_t __state;
+} __fpos_t;
+
+#endif

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@types@__locale_t.h

@@ -0,0 +1,44 @@
+/* Definition of struct __locale_struct and __locale_t.
+   Copyright (C) 1997-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _BITS_TYPES___LOCALE_T_H
+#define _BITS_TYPES___LOCALE_T_H 1
+
+/* POSIX.1-2008: the locale_t type, representing a locale context
+   (implementation-namespace version).  This type should be treated
+   as opaque by applications; some details are exposed for the sake of
+   efficiency in e.g. ctype functions.  */
+
+struct __locale_struct
+{
+  /* Note: LC_ALL is not a valid index into this array.  */
+  struct __locale_data *__locales[13]; /* 13 = __LC_LAST. */
+
+  /* To increase the speed of this solution we add some special members.  */
+  const unsigned short int *__ctype_b;
+  const int *__ctype_tolower;
+  const int *__ctype_toupper;
+
+  /* Note: LC_ALL is not a valid index into this array.  */
+  const char *__names[13];
+};
+
+typedef struct __locale_struct *__locale_t;
+
+#endif /* bits/types/__locale_t.h */

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@types@__mbstate_t.h

@@ -0,0 +1,23 @@
+#ifndef ____mbstate_t_defined
+#define ____mbstate_t_defined 1
+
+/* Integral type unchanged by default argument promotions that can
+   hold any value corresponding to members of the extended character
+   set, as well as at least one value that does not correspond to any
+   member of the extended character set.  */
+#ifndef __WINT_TYPE__
+# define __WINT_TYPE__ unsigned int
+#endif
+
+/* Conversion state information.  */
+typedef struct
+{
+  int __count;
+  union
+  {
+    __WINT_TYPE__ __wch;
+    char __wchb[4];
+  } __value;		/* Value so far.  */
+} __mbstate_t;
+
+#endif

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@types@__sigset_t.h

@@ -0,0 +1,10 @@
+#ifndef ____sigset_t_defined
+#define ____sigset_t_defined
+
+#define _SIGSET_NWORDS (1024 / (8 * sizeof (unsigned long int)))
+typedef struct
+{
+  unsigned long int __val[_SIGSET_NWORDS];
+} __sigset_t;
+
+#endif

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@types@clock_t.h

@@ -0,0 +1,9 @@
+#ifndef __clock_t_defined
+#define __clock_t_defined 1
+
+#include <bits/types.h>
+
+/* Returned by `clock'.  */
+typedef __clock_t clock_t;
+
+#endif

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@types@clockid_t.h

@@ -0,0 +1,9 @@
+#ifndef __clockid_t_defined
+#define __clockid_t_defined 1
+
+#include <bits/types.h>
+
+/* Clock ID used in clock and timer functions.  */
+typedef __clockid_t clockid_t;
+
+#endif

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@types@cookie_io_functions_t.h

@@ -0,0 +1,63 @@
+/* Copyright (C) 1991-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef __cookie_io_functions_t_defined
+#define __cookie_io_functions_t_defined 1
+
+#include <bits/types.h>
+
+/* Functions to do I/O and file management for a stream.  */
+
+/* Read NBYTES bytes from COOKIE into a buffer pointed to by BUF.
+   Return number of bytes read.  */
+typedef __ssize_t cookie_read_function_t (void *__cookie, char *__buf,
+                                          size_t __nbytes);
+
+/* Write NBYTES bytes pointed to by BUF to COOKIE.  Write all NBYTES bytes
+   unless there is an error.  Return number of bytes written.  If
+   there is an error, return 0 and do not write anything.  If the file
+   has been opened for append (__mode.__append set), then set the file
+   pointer to the end of the file and then do the write; if not, just
+   write at the current file pointer.  */
+typedef __ssize_t cookie_write_function_t (void *__cookie, const char *__buf,
+                                           size_t __nbytes);
+
+/* Move COOKIE's file position to *POS bytes from the
+   beginning of the file (if W is SEEK_SET),
+   the current position (if W is SEEK_CUR),
+   or the end of the file (if W is SEEK_END).
+   Set *POS to the new file position.
+   Returns zero if successful, nonzero if not.  */
+typedef int cookie_seek_function_t (void *__cookie, __off64_t *__pos, int __w);
+
+/* Close COOKIE.  */
+typedef int cookie_close_function_t (void *__cookie);
+
+/* The structure with the cookie function pointers.
+   The tag name of this struct is _IO_cookie_io_functions_t to
+   preserve historic C++ mangled names for functions taking
+   cookie_io_functions_t arguments.  That name should not be used in
+   new code.  */
+typedef struct _IO_cookie_io_functions_t
+{
+  cookie_read_function_t *read;		/* Read bytes.  */
+  cookie_write_function_t *write;	/* Write bytes.  */
+  cookie_seek_function_t *seek;		/* Seek/tell file position.  */
+  cookie_close_function_t *close;	/* Close file.  */
+} cookie_io_functions_t;
+
+#endif

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@types@locale_t.h

@@ -0,0 +1,26 @@
+/* Definition of locale_t.
+   Copyright (C) 2017-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _BITS_TYPES_LOCALE_T_H
+#define _BITS_TYPES_LOCALE_T_H 1
+
+#include <bits/types/__locale_t.h>
+
+typedef __locale_t locale_t;
+
+#endif /* bits/types/locale_t.h */

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@types@sigset_t.h

@@ -0,0 +1,9 @@
+#ifndef __sigset_t_defined
+#define __sigset_t_defined 1
+
+#include <bits/types/__sigset_t.h>
+
+/* A set of signals to be blocked, unblocked, or waited for.  */
+typedef __sigset_t sigset_t;
+
+#endif

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@types@struct_FILE.h

@@ -0,0 +1,120 @@
+/* Copyright (C) 1991-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef __struct_FILE_defined
+#define __struct_FILE_defined 1
+
+/* Caution: The contents of this file are not part of the official
+   stdio.h API.  However, much of it is part of the official *binary*
+   interface, and therefore cannot be changed.  */
+
+#if defined _IO_USE_OLD_IO_FILE && !defined _LIBC
+# error "_IO_USE_OLD_IO_FILE should only be defined when building libc itself"
+#endif
+
+#if defined _IO_lock_t_defined && !defined _LIBC
+# error "_IO_lock_t_defined should only be defined when building libc itself"
+#endif
+
+#include <bits/types.h>
+
+struct _IO_FILE;
+struct _IO_marker;
+struct _IO_codecvt;
+struct _IO_wide_data;
+
+/* During the build of glibc itself, _IO_lock_t will already have been
+   defined by internal headers.  */
+#ifndef _IO_lock_t_defined
+typedef void _IO_lock_t;
+#endif
+
+/* The tag name of this struct is _IO_FILE to preserve historic
+   C++ mangled names for functions taking FILE* arguments.
+   That name should not be used in new code.  */
+struct _IO_FILE
+{
+  int _flags;		/* High-order word is _IO_MAGIC; rest is flags. */
+
+  /* The following pointers correspond to the C++ streambuf protocol. */
+  char *_IO_read_ptr;	/* Current read pointer */
+  char *_IO_read_end;	/* End of get area. */
+  char *_IO_read_base;	/* Start of putback+get area. */
+  char *_IO_write_base;	/* Start of put area. */
+  char *_IO_write_ptr;	/* Current put pointer. */
+  char *_IO_write_end;	/* End of put area. */
+  char *_IO_buf_base;	/* Start of reserve area. */
+  char *_IO_buf_end;	/* End of reserve area. */
+
+  /* The following fields are used to support backing up and undo. */
+  char *_IO_save_base; /* Pointer to start of non-current get area. */
+  char *_IO_backup_base;  /* Pointer to first valid character of backup area */
+  char *_IO_save_end; /* Pointer to end of non-current get area. */
+
+  struct _IO_marker *_markers;
+
+  struct _IO_FILE *_chain;
+
+  int _fileno;
+  int _flags2;
+  __off_t _old_offset; /* This used to be _offset but it's too small.  */
+
+  /* 1+column number of pbase(); 0 is unknown. */
+  unsigned short _cur_column;
+  signed char _vtable_offset;
+  char _shortbuf[1];
+
+  _IO_lock_t *_lock;
+#ifdef _IO_USE_OLD_IO_FILE
+};
+
+struct _IO_FILE_complete
+{
+  struct _IO_FILE _file;
+#endif
+  __off64_t _offset;
+  /* Wide character stream stuff.  */
+  struct _IO_codecvt *_codecvt;
+  struct _IO_wide_data *_wide_data;
+  struct _IO_FILE *_freeres_list;
+  void *_freeres_buf;
+  size_t __pad5;
+  int _mode;
+  /* Make sure we don't get into trouble again.  */
+  char _unused2[15 * sizeof (int) - 4 * sizeof (void *) - sizeof (size_t)];
+};
+
+/* These macros are used by bits/stdio.h and internal headers.  */
+#define __getc_unlocked_body(_fp)					\
+  (__glibc_unlikely ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end)	\
+   ? __uflow (_fp) : *(unsigned char *) (_fp)->_IO_read_ptr++)
+
+#define __putc_unlocked_body(_ch, _fp)					\
+  (__glibc_unlikely ((_fp)->_IO_write_ptr >= (_fp)->_IO_write_end)	\
+   ? __overflow (_fp, (unsigned char) (_ch))				\
+   : (unsigned char) (*(_fp)->_IO_write_ptr++ = (_ch)))
+
+#define _IO_EOF_SEEN 0x0010
+#define __feof_unlocked_body(_fp) (((_fp)->_flags & _IO_EOF_SEEN) != 0)
+
+#define _IO_ERR_SEEN 0x0020
+#define __ferror_unlocked_body(_fp) (((_fp)->_flags & _IO_ERR_SEEN) != 0)
+
+#define _IO_USER_LOCK 0x8000
+/* Many more flag bits are defined internally.  */
+
+#endif

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@types@struct_timespec.h

@@ -0,0 +1,15 @@
+/* NB: Include guard matches what <linux/time.h> uses.  */
+#ifndef _STRUCT_TIMESPEC
+#define _STRUCT_TIMESPEC 1
+
+#include <bits/types.h>
+
+/* POSIX.1b structure for a time value.  This is like a `struct timeval' but
+   has nanoseconds instead of microseconds.  */
+struct timespec
+{
+  __time_t tv_sec;		/* Seconds.  */
+  __syscall_slong_t tv_nsec;	/* Nanoseconds.  */
+};
+
+#endif

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@types@struct_timeval.h

@@ -0,0 +1,13 @@
+#ifndef __timeval_defined
+#define __timeval_defined 1
+
+#include <bits/types.h>
+
+/* A time value that is accurate to the nearest
+   microsecond but also has a range of years.  */
+struct timeval
+{
+  __time_t tv_sec;		/* Seconds.  */
+  __suseconds_t tv_usec;	/* Microseconds.  */
+};
+#endif

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@types@time_t.h

@@ -0,0 +1,9 @@
+#ifndef __time_t_defined
+#define __time_t_defined 1
+
+#include <bits/types.h>
+
+/* Returned by `time'.  */
+typedef __time_t time_t;
+
+#endif

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@types@timer_t.h

@@ -0,0 +1,9 @@
+#ifndef __timer_t_defined
+#define __timer_t_defined 1
+
+#include <bits/types.h>
+
+/* Timer ID returned by `timer_create'.  */
+typedef __timer_t timer_t;
+
+#endif

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@typesizes.h

@@ -0,0 +1,95 @@
+/* bits/typesizes.h -- underlying types for *_t.  Linux/x86-64 version.
+   Copyright (C) 2012-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _BITS_TYPES_H
+# error "Never include <bits/typesizes.h> directly; use <sys/types.h> instead."
+#endif
+
+#ifndef	_BITS_TYPESIZES_H
+#define	_BITS_TYPESIZES_H	1
+
+/* See <bits/types.h> for the meaning of these macros.  This file exists so
+   that <bits/types.h> need not vary across different GNU platforms.  */
+
+/* X32 kernel interface is 64-bit.  */
+#if defined __x86_64__ && defined __ILP32__
+# define __SYSCALL_SLONG_TYPE	__SQUAD_TYPE
+# define __SYSCALL_ULONG_TYPE	__UQUAD_TYPE
+#else
+# define __SYSCALL_SLONG_TYPE	__SLONGWORD_TYPE
+# define __SYSCALL_ULONG_TYPE	__ULONGWORD_TYPE
+#endif
+
+#define __DEV_T_TYPE		__UQUAD_TYPE
+#define __UID_T_TYPE		__U32_TYPE
+#define __GID_T_TYPE		__U32_TYPE
+#define __INO_T_TYPE		__SYSCALL_ULONG_TYPE
+#define __INO64_T_TYPE		__UQUAD_TYPE
+#define __MODE_T_TYPE		__U32_TYPE
+#ifdef __x86_64__
+# define __NLINK_T_TYPE		__SYSCALL_ULONG_TYPE
+# define __FSWORD_T_TYPE	__SYSCALL_SLONG_TYPE
+#else
+# define __NLINK_T_TYPE		__UWORD_TYPE
+# define __FSWORD_T_TYPE	__SWORD_TYPE
+#endif
+#define __OFF_T_TYPE		__SYSCALL_SLONG_TYPE
+#define __OFF64_T_TYPE		__SQUAD_TYPE
+#define __PID_T_TYPE		__S32_TYPE
+#define __RLIM_T_TYPE		__SYSCALL_ULONG_TYPE
+#define __RLIM64_T_TYPE		__UQUAD_TYPE
+#define __BLKCNT_T_TYPE		__SYSCALL_SLONG_TYPE
+#define __BLKCNT64_T_TYPE	__SQUAD_TYPE
+#define __FSBLKCNT_T_TYPE	__SYSCALL_ULONG_TYPE
+#define __FSBLKCNT64_T_TYPE	__UQUAD_TYPE
+#define __FSFILCNT_T_TYPE	__SYSCALL_ULONG_TYPE
+#define __FSFILCNT64_T_TYPE	__UQUAD_TYPE
+#define __ID_T_TYPE		__U32_TYPE
+#define __CLOCK_T_TYPE		__SYSCALL_SLONG_TYPE
+#define __TIME_T_TYPE		__SYSCALL_SLONG_TYPE
+#define __USECONDS_T_TYPE	__U32_TYPE
+#define __SUSECONDS_T_TYPE	__SYSCALL_SLONG_TYPE
+#define __DADDR_T_TYPE		__S32_TYPE
+#define __KEY_T_TYPE		__S32_TYPE
+#define __CLOCKID_T_TYPE	__S32_TYPE
+#define __TIMER_T_TYPE		void *
+#define __BLKSIZE_T_TYPE	__SYSCALL_SLONG_TYPE
+#define __FSID_T_TYPE		struct { int __val[2]; }
+#define __SSIZE_T_TYPE		__SWORD_TYPE
+#define __CPU_MASK_TYPE 	__SYSCALL_ULONG_TYPE
+
+#ifdef __x86_64__
+/* Tell the libc code that off_t and off64_t are actually the same type
+   for all ABI purposes, even if possibly expressed as different base types
+   for C type-checking purposes.  */
+# define __OFF_T_MATCHES_OFF64_T	1
+
+/* Same for ino_t and ino64_t.  */
+# define __INO_T_MATCHES_INO64_T	1
+
+/* And for __rlim_t and __rlim64_t.  */
+# define __RLIM_T_MATCHES_RLIM64_T	1
+#else
+# define __RLIM_T_MATCHES_RLIM64_T	0
+#endif
+
+/* Number of descriptors that can fit in an `fd_set'.  */
+#define __FD_SETSIZE		1024
+
+
+#endif /* bits/typesizes.h */

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@uintn-identity.h

@@ -0,0 +1,50 @@
+/* Inline functions to return unsigned integer values unchanged.
+   Copyright (C) 2017-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#if !defined _NETINET_IN_H && !defined _ENDIAN_H
+# error "Never use <bits/uintn-identity.h> directly; include <netinet/in.h> or <endian.h> instead."
+#endif
+
+#ifndef _BITS_UINTN_IDENTITY_H
+#define _BITS_UINTN_IDENTITY_H 1
+
+#include <bits/types.h>
+
+/* These inline functions are to ensure the appropriate type
+   conversions and associated diagnostics from macros that convert to
+   a given endianness.  */
+
+static __inline __uint16_t
+__uint16_identity (__uint16_t __x)
+{
+  return __x;
+}
+
+static __inline __uint32_t
+__uint32_identity (__uint32_t __x)
+{
+  return __x;
+}
+
+static __inline __uint64_t
+__uint64_identity (__uint64_t __x)
+{
+  return __x;
+}
+
+#endif /* _BITS_UINTN_IDENTITY_H.  */

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@waitflags.h

@@ -0,0 +1,39 @@
+/* Definitions of flag bits for `waitpid' et al.
+   Copyright (C) 1992-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#if !defined _SYS_WAIT_H && !defined _STDLIB_H
+# error "Never include <bits/waitflags.h> directly; use <sys/wait.h> instead."
+#endif
+
+
+/* Bits in the third argument to `waitpid'.  */
+#define	WNOHANG		1	/* Don't block waiting.  */
+#define	WUNTRACED	2	/* Report status of stopped children.  */
+
+/* Bits in the fourth argument to `waitid'.  */
+#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
+# define WSTOPPED	2	/* Report stopped child (same as WUNTRACED). */
+# define WEXITED	4	/* Report dead child.  */
+# define WCONTINUED	8	/* Report continued child.  */
+# define WNOWAIT	0x01000000 /* Don't reap, just poll status.  */
+#endif
+
+#define __WNOTHREAD     0x20000000 /* Don't wait on children of other threads
+				      in this group */
+#define __WALL		0x40000000 /* Wait for any child.  */
+#define __WCLONE	0x80000000 /* Wait for cloned process.  */

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@waitstatus.h

@@ -0,0 +1,59 @@
+/* Definitions of status bits for `wait' et al.
+   Copyright (C) 1992-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#if !defined _SYS_WAIT_H && !defined _STDLIB_H
+# error "Never include <bits/waitstatus.h> directly; use <sys/wait.h> instead."
+#endif
+
+
+/* Everything extant so far uses these same bits.  */
+
+
+/* If WIFEXITED(STATUS), the low-order 8 bits of the status.  */
+#define	__WEXITSTATUS(status)	(((status) & 0xff00) >> 8)
+
+/* If WIFSIGNALED(STATUS), the terminating signal.  */
+#define	__WTERMSIG(status)	((status) & 0x7f)
+
+/* If WIFSTOPPED(STATUS), the signal that stopped the child.  */
+#define	__WSTOPSIG(status)	__WEXITSTATUS(status)
+
+/* Nonzero if STATUS indicates normal termination.  */
+#define	__WIFEXITED(status)	(__WTERMSIG(status) == 0)
+
+/* Nonzero if STATUS indicates termination by a signal.  */
+#define __WIFSIGNALED(status) \
+  (((signed char) (((status) & 0x7f) + 1) >> 1) > 0)
+
+/* Nonzero if STATUS indicates the child is stopped.  */
+#define	__WIFSTOPPED(status)	(((status) & 0xff) == 0x7f)
+
+/* Nonzero if STATUS indicates the child continued after a stop.  We only
+   define this if <bits/waitflags.h> provides the WCONTINUED flag bit.  */
+#ifdef WCONTINUED
+# define __WIFCONTINUED(status)	((status) == __W_CONTINUED)
+#endif
+
+/* Nonzero if STATUS indicates the child dumped core.  */
+#define	__WCOREDUMP(status)	((status) & __WCOREFLAG)
+
+/* Macros for constructing status values.  */
+#define	__W_EXITCODE(ret, sig)	((ret) << 8 | (sig))
+#define	__W_STOPCODE(sig)	((sig) << 8 | 0x7f)
+#define __W_CONTINUED		0xffff
+#define	__WCOREFLAG		0x80

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@bits@wordsize.h

@@ -0,0 +1,17 @@
+/* Determine the wordsize from the preprocessor defines.  */
+
+#if defined __x86_64__ && !defined __ILP32__
+# define __WORDSIZE	64
+#else
+# define __WORDSIZE	32
+#define __WORDSIZE32_SIZE_ULONG		0
+#define __WORDSIZE32_PTRDIFF_LONG	0
+#endif
+
+#ifdef __x86_64__
+# define __WORDSIZE_TIME64_COMPAT32	1
+/* Both x86-64 and x32 use the 64-bit system call interface.  */
+# define __SYSCALL_WORDSIZE		64
+#else
+# define __WORDSIZE_TIME64_COMPAT32	0
+#endif

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@c++@9@bits@std_abs.h

@@ -0,0 +1,111 @@
+// -*- C++ -*- C library enhancements header.
+
+// Copyright (C) 2016-2019 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file include/bits/std_abs.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{cmath, cstdlib}
+ */
+
+#ifndef _GLIBCXX_BITS_STD_ABS_H
+#define _GLIBCXX_BITS_STD_ABS_H
+
+#pragma GCC system_header
+
+#include <bits/c++config.h>
+
+#define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
+#include_next <stdlib.h>
+#ifdef __CORRECT_ISO_CPP_MATH_H_PROTO
+# include_next <math.h>
+#endif
+#undef _GLIBCXX_INCLUDE_NEXT_C_HEADERS
+
+#undef abs
+
+extern "C++"
+{
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  using ::abs;
+
+#ifndef __CORRECT_ISO_CPP_STDLIB_H_PROTO
+  inline long
+  abs(long __i) { return __builtin_labs(__i); }
+#endif
+
+#ifdef _GLIBCXX_USE_LONG_LONG
+  inline long long
+  abs(long long __x) { return __builtin_llabs (__x); }
+#endif
+
+// _GLIBCXX_RESOLVE_LIB_DEFECTS
+// 2192. Validity and return type of std::abs(0u) is unclear
+// 2294. <cstdlib> should declare abs(double)
+// 2735. std::abs(short), std::abs(signed char) and others should return int
+
+#ifndef __CORRECT_ISO_CPP_MATH_H_PROTO
+  inline _GLIBCXX_CONSTEXPR double
+  abs(double __x)
+  { return __builtin_fabs(__x); }
+
+  inline _GLIBCXX_CONSTEXPR float
+  abs(float __x)
+  { return __builtin_fabsf(__x); }
+
+  inline _GLIBCXX_CONSTEXPR long double
+  abs(long double __x)
+  { return __builtin_fabsl(__x); }
+#endif
+
+#if defined(__GLIBCXX_TYPE_INT_N_0)
+  inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_0
+  abs(__GLIBCXX_TYPE_INT_N_0 __x) { return __x >= 0 ? __x : -__x; }
+#endif
+#if defined(__GLIBCXX_TYPE_INT_N_1)
+  inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_1
+  abs(__GLIBCXX_TYPE_INT_N_1 __x) { return __x >= 0 ? __x : -__x; }
+#endif
+#if defined(__GLIBCXX_TYPE_INT_N_2)
+  inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_2
+  abs(__GLIBCXX_TYPE_INT_N_2 __x) { return __x >= 0 ? __x : -__x; }
+#endif
+#if defined(__GLIBCXX_TYPE_INT_N_3)
+  inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_3
+  abs(__GLIBCXX_TYPE_INT_N_3 __x) { return __x >= 0 ? __x : -__x; }
+#endif
+
+#if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128)
+  inline _GLIBCXX_CONSTEXPR
+  __float128
+  abs(__float128 __x)
+  { return __x < 0 ? -__x : __x; }
+#endif
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+} // extern "C"++"
+
+#endif // _GLIBCXX_BITS_STD_ABS_H

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@c++@9@cstdlib

@@ -0,0 +1,261 @@
+// -*- C++ -*- forwarding header.
+
+// Copyright (C) 1997-2019 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file include/cstdlib
+ *  This is a Standard C++ Library file.  You should @c \#include this file
+ *  in your programs, rather than any of the @a *.h implementation files.
+ *
+ *  This is the C++ version of the Standard C Library header @c stdlib.h,
+ *  and its contents are (mostly) the same as that header, but are all
+ *  contained in the namespace @c std (except for names which are defined
+ *  as macros in C).
+ */
+
+//
+// ISO C++ 14882: 20.4.6  C library
+//
+
+#pragma GCC system_header
+
+#include <bits/c++config.h>
+
+#ifndef _GLIBCXX_CSTDLIB
+#define _GLIBCXX_CSTDLIB 1
+
+#if !_GLIBCXX_HOSTED
+// The C standard does not require a freestanding implementation to
+// provide <stdlib.h>.  However, the C++ standard does still require
+// <cstdlib> -- but only the functionality mentioned in
+// [lib.support.start.term].
+
+#define EXIT_SUCCESS 0
+#define EXIT_FAILURE 1
+
+namespace std
+{
+  extern "C" void abort(void) throw () _GLIBCXX_NORETURN;
+  extern "C" int atexit(void (*)(void)) throw ();
+  extern "C" void exit(int) throw () _GLIBCXX_NORETURN;
+#if __cplusplus >= 201103L
+# ifdef _GLIBCXX_HAVE_AT_QUICK_EXIT
+  extern "C" int at_quick_exit(void (*)(void)) throw ();
+# endif
+# ifdef _GLIBCXX_HAVE_QUICK_EXIT
+  extern "C" void quick_exit(int) throw() _GLIBCXX_NORETURN;
+# endif
+#endif
+} // namespace std
+
+#else
+
+// Need to ensure this finds the C library's <stdlib.h> not a libstdc++
+// wrapper that might already be installed later in the include search path.
+#define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
+#include_next <stdlib.h>
+#undef _GLIBCXX_INCLUDE_NEXT_C_HEADERS
+#include <bits/std_abs.h>
+
+// Get rid of those macros defined in <stdlib.h> in lieu of real functions.
+#undef abort
+#if __cplusplus >= 201703L && defined(_GLIBCXX_HAVE_ALIGNED_ALLOC)
+# undef aligned_alloc
+#endif
+#undef atexit
+#if __cplusplus >= 201103L
+# ifdef _GLIBCXX_HAVE_AT_QUICK_EXIT
+#  undef at_quick_exit
+# endif
+#endif
+#undef atof
+#undef atoi
+#undef atol
+#undef bsearch
+#undef calloc
+#undef div
+#undef exit
+#undef free
+#undef getenv
+#undef labs
+#undef ldiv
+#undef malloc
+#undef mblen
+#undef mbstowcs
+#undef mbtowc
+#undef qsort
+#if __cplusplus >= 201103L
+# ifdef _GLIBCXX_HAVE_QUICK_EXIT
+#  undef quick_exit
+# endif
+#endif
+#undef rand
+#undef realloc
+#undef srand
+#undef strtod
+#undef strtol
+#undef strtoul
+#undef system
+#undef wcstombs
+#undef wctomb
+
+extern "C++"
+{
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  using ::div_t;
+  using ::ldiv_t;
+
+  using ::abort;
+#if __cplusplus >= 201703L && defined(_GLIBCXX_HAVE_ALIGNED_ALLOC)
+  using ::aligned_alloc;
+#endif
+  using ::atexit;
+#if __cplusplus >= 201103L
+# ifdef _GLIBCXX_HAVE_AT_QUICK_EXIT
+  using ::at_quick_exit;
+# endif
+#endif
+  using ::atof;
+  using ::atoi;
+  using ::atol;
+  using ::bsearch;
+  using ::calloc;
+  using ::div;
+  using ::exit;
+  using ::free;
+  using ::getenv;
+  using ::labs;
+  using ::ldiv;
+  using ::malloc;
+#ifdef _GLIBCXX_HAVE_MBSTATE_T
+  using ::mblen;
+  using ::mbstowcs;
+  using ::mbtowc;
+#endif // _GLIBCXX_HAVE_MBSTATE_T
+  using ::qsort;
+#if __cplusplus >= 201103L
+# ifdef _GLIBCXX_HAVE_QUICK_EXIT
+  using ::quick_exit;
+# endif
+#endif
+  using ::rand;
+  using ::realloc;
+  using ::srand;
+  using ::strtod;
+  using ::strtol;
+  using ::strtoul;
+  using ::system;
+#ifdef _GLIBCXX_USE_WCHAR_T
+  using ::wcstombs;
+  using ::wctomb;
+#endif // _GLIBCXX_USE_WCHAR_T
+
+#ifndef __CORRECT_ISO_CPP_STDLIB_H_PROTO
+  inline ldiv_t
+  div(long __i, long __j) { return ldiv(__i, __j); }
+#endif
+
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+#if _GLIBCXX_USE_C99_STDLIB
+
+#undef _Exit
+#undef llabs
+#undef lldiv
+#undef atoll
+#undef strtoll
+#undef strtoull
+#undef strtof
+#undef strtold
+
+namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+#if !_GLIBCXX_USE_C99_LONG_LONG_DYNAMIC
+  using ::lldiv_t;
+#endif
+#if _GLIBCXX_USE_C99_CHECK || _GLIBCXX_USE_C99_DYNAMIC
+  extern "C" void (_Exit)(int) throw () _GLIBCXX_NORETURN;
+#endif
+#if !_GLIBCXX_USE_C99_DYNAMIC
+  using ::_Exit;
+#endif
+
+#if !_GLIBCXX_USE_C99_LONG_LONG_DYNAMIC
+  using ::llabs;
+
+  inline lldiv_t
+  div(long long __n, long long __d)
+  { lldiv_t __q; __q.quot = __n / __d; __q.rem = __n % __d; return __q; }
+
+  using ::lldiv;
+#endif
+
+#if _GLIBCXX_USE_C99_LONG_LONG_CHECK || _GLIBCXX_USE_C99_LONG_LONG_DYNAMIC
+  extern "C" long long int (atoll)(const char *) throw ();
+  extern "C" long long int
+    (strtoll)(const char * __restrict, char ** __restrict, int) throw ();
+  extern "C" unsigned long long int
+    (strtoull)(const char * __restrict, char ** __restrict, int) throw ();
+#endif
+#if !_GLIBCXX_USE_C99_LONG_LONG_DYNAMIC
+  using ::atoll;
+  using ::strtoll;
+  using ::strtoull;
+#endif
+  using ::strtof;
+  using ::strtold;
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace __gnu_cxx
+
+namespace std
+{
+#if !_GLIBCXX_USE_C99_LONG_LONG_DYNAMIC
+  using ::__gnu_cxx::lldiv_t;
+#endif
+  using ::__gnu_cxx::_Exit;
+#if !_GLIBCXX_USE_C99_LONG_LONG_DYNAMIC
+  using ::__gnu_cxx::llabs;
+  using ::__gnu_cxx::div;
+  using ::__gnu_cxx::lldiv;
+#endif
+  using ::__gnu_cxx::atoll;
+  using ::__gnu_cxx::strtof;
+  using ::__gnu_cxx::strtoll;
+  using ::__gnu_cxx::strtoull;
+  using ::__gnu_cxx::strtold;
+} // namespace std
+
+#endif // _GLIBCXX_USE_C99_STDLIB
+
+} // extern "C++"
+
+#endif // !_GLIBCXX_HOSTED
+
+#endif

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@c++@9@stdlib.h

@@ -0,0 +1,86 @@
+// -*- C++ -*- compatibility header.
+
+// Copyright (C) 2002-2019 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file stdlib.h
+ *  This is a Standard C++ Library header.
+ */
+
+#if !defined __cplusplus || defined _GLIBCXX_INCLUDE_NEXT_C_HEADERS
+# include_next <stdlib.h>
+#else
+
+#ifndef _GLIBCXX_STDLIB_H
+#define _GLIBCXX_STDLIB_H 1
+
+# include <cstdlib>
+
+using std::abort;
+using std::atexit;
+using std::exit;
+#if __cplusplus >= 201103L
+# ifdef _GLIBCXX_HAVE_AT_QUICK_EXIT
+  using std::at_quick_exit;
+# endif
+# ifdef _GLIBCXX_HAVE_QUICK_EXIT
+  using std::quick_exit;
+# endif
+#endif
+
+#if _GLIBCXX_HOSTED
+using std::div_t;
+using std::ldiv_t;
+
+using std::abs;
+using std::atof;
+using std::atoi;
+using std::atol;
+using std::bsearch;
+using std::calloc;
+using std::div;
+using std::free;
+using std::getenv;
+using std::labs;
+using std::ldiv;
+using std::malloc;
+#ifdef _GLIBCXX_HAVE_MBSTATE_T
+using std::mblen;
+using std::mbstowcs;
+using std::mbtowc;
+#endif // _GLIBCXX_HAVE_MBSTATE_T
+using std::qsort;
+using std::rand;
+using std::realloc;
+using std::srand;
+using std::strtod;
+using std::strtol;
+using std::strtoul;
+using std::system;
+#ifdef _GLIBCXX_USE_WCHAR_T
+using std::wcstombs;
+using std::wctomb;
+#endif // _GLIBCXX_USE_WCHAR_T
+#endif
+
+#endif // _GLIBCXX_STDLIB_H
+#endif // __cplusplus

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@c++@9@x86_64-redhat-linux@bits@cpu_defines.h

@@ -0,0 +1,33 @@
+// Specific definitions for generic platforms  -*- C++ -*-
+
+// Copyright (C) 2005-2019 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/cpu_defines.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{iosfwd}
+ */
+
+#ifndef _GLIBCXX_CPU_DEFINES
+#define _GLIBCXX_CPU_DEFINES 1
+
+#endif

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@c++@9@x86_64-redhat-linux@bits@os_defines.h

@@ -0,0 +1,52 @@
+// Specific definitions for GNU/Linux  -*- C++ -*-
+
+// Copyright (C) 2000-2019 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/os_defines.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{iosfwd}
+ */
+
+#ifndef _GLIBCXX_OS_DEFINES
+#define _GLIBCXX_OS_DEFINES 1
+
+// System-specific #define, typedefs, corrections, etc, go here.  This
+// file will come before all others.
+
+// This keeps isanum, et al from being propagated as macros.
+#define __NO_CTYPE 1
+
+#include <features.h>
+
+// Provide a declaration for the possibly deprecated gets function, as
+// glibc 2.15 and later does not declare gets for ISO C11 when
+// __GNU_SOURCE is defined.
+#if __GLIBC_PREREQ(2,15) && defined(_GNU_SOURCE)
+# undef _GLIBCXX_HAVE_GETS
+#endif
+
+// Glibc 2.23 removed the obsolete isinf and isnan declarations. Check the
+// version dynamically in case it has changed since libstdc++ was configured.
+#define _GLIBCXX_NO_OBSOLETE_ISINF_ISNAN_DYNAMIC __GLIBC_PREREQ(2,23)
+
+#endif

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@endian.h

@@ -0,0 +1,97 @@
+/* Copyright (C) 1992-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef	_ENDIAN_H
+#define	_ENDIAN_H	1
+
+#include <features.h>
+
+/* Definitions for byte order, according to significance of bytes,
+   from low addresses to high addresses.  The value is what you get by
+   putting '4' in the most significant byte, '3' in the second most
+   significant byte, '2' in the second least significant byte, and '1'
+   in the least significant byte, and then writing down one digit for
+   each byte, starting with the byte at the lowest address at the left,
+   and proceeding to the byte with the highest address at the right.  */
+
+#define	__LITTLE_ENDIAN	1234
+#define	__BIG_ENDIAN	4321
+#define	__PDP_ENDIAN	3412
+
+/* This file defines `__BYTE_ORDER' for the particular machine.  */
+#include <bits/endian.h>
+
+/* Some machines may need to use a different endianness for floating point
+   values.  */
+#ifndef __FLOAT_WORD_ORDER
+# define __FLOAT_WORD_ORDER __BYTE_ORDER
+#endif
+
+#ifdef	__USE_MISC
+# define LITTLE_ENDIAN	__LITTLE_ENDIAN
+# define BIG_ENDIAN	__BIG_ENDIAN
+# define PDP_ENDIAN	__PDP_ENDIAN
+# define BYTE_ORDER	__BYTE_ORDER
+#endif
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+# define __LONG_LONG_PAIR(HI, LO) LO, HI
+#elif __BYTE_ORDER == __BIG_ENDIAN
+# define __LONG_LONG_PAIR(HI, LO) HI, LO
+#endif
+
+
+#if defined __USE_MISC && !defined __ASSEMBLER__
+/* Conversion interfaces.  */
+# include <bits/byteswap.h>
+# include <bits/uintn-identity.h>
+
+# if __BYTE_ORDER == __LITTLE_ENDIAN
+#  define htobe16(x) __bswap_16 (x)
+#  define htole16(x) __uint16_identity (x)
+#  define be16toh(x) __bswap_16 (x)
+#  define le16toh(x) __uint16_identity (x)
+
+#  define htobe32(x) __bswap_32 (x)
+#  define htole32(x) __uint32_identity (x)
+#  define be32toh(x) __bswap_32 (x)
+#  define le32toh(x) __uint32_identity (x)
+
+#  define htobe64(x) __bswap_64 (x)
+#  define htole64(x) __uint64_identity (x)
+#  define be64toh(x) __bswap_64 (x)
+#  define le64toh(x) __uint64_identity (x)
+
+# else
+#  define htobe16(x) __uint16_identity (x)
+#  define htole16(x) __bswap_16 (x)
+#  define be16toh(x) __uint16_identity (x)
+#  define le16toh(x) __bswap_16 (x)
+
+#  define htobe32(x) __uint32_identity (x)
+#  define htole32(x) __bswap_32 (x)
+#  define be32toh(x) __uint32_identity (x)
+#  define le32toh(x) __bswap_32 (x)
+
+#  define htobe64(x) __uint64_identity (x)
+#  define htole64(x) __bswap_64 (x)
+#  define be64toh(x) __uint64_identity (x)
+#  define le64toh(x) __bswap_64 (x)
+# endif
+#endif
+
+#endif	/* endian.h */

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@features.h

@@ -0,0 +1,477 @@
+/* Copyright (C) 1991-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef	_FEATURES_H
+#define	_FEATURES_H	1
+
+/* These are defined by the user (or the compiler)
+   to specify the desired environment:
+
+   __STRICT_ANSI__	ISO Standard C.
+   _ISOC99_SOURCE	Extensions to ISO C89 from ISO C99.
+   _ISOC11_SOURCE	Extensions to ISO C99 from ISO C11.
+   __STDC_WANT_LIB_EXT2__
+			Extensions to ISO C99 from TR 27431-2:2010.
+   __STDC_WANT_IEC_60559_BFP_EXT__
+			Extensions to ISO C11 from TS 18661-1:2014.
+   __STDC_WANT_IEC_60559_FUNCS_EXT__
+			Extensions to ISO C11 from TS 18661-4:2015.
+   __STDC_WANT_IEC_60559_TYPES_EXT__
+			Extensions to ISO C11 from TS 18661-3:2015.
+
+   _POSIX_SOURCE	IEEE Std 1003.1.
+   _POSIX_C_SOURCE	If ==1, like _POSIX_SOURCE; if >=2 add IEEE Std 1003.2;
+			if >=199309L, add IEEE Std 1003.1b-1993;
+			if >=199506L, add IEEE Std 1003.1c-1995;
+			if >=200112L, all of IEEE 1003.1-2004
+			if >=200809L, all of IEEE 1003.1-2008
+   _XOPEN_SOURCE	Includes POSIX and XPG things.  Set to 500 if
+			Single Unix conformance is wanted, to 600 for the
+			sixth revision, to 700 for the seventh revision.
+   _XOPEN_SOURCE_EXTENDED XPG things and X/Open Unix extensions.
+   _LARGEFILE_SOURCE	Some more functions for correct standard I/O.
+   _LARGEFILE64_SOURCE	Additional functionality from LFS for large files.
+   _FILE_OFFSET_BITS=N	Select default filesystem interface.
+   _ATFILE_SOURCE	Additional *at interfaces.
+   _GNU_SOURCE		All of the above, plus GNU extensions.
+   _DEFAULT_SOURCE	The default set of features (taking precedence over
+			__STRICT_ANSI__).
+
+   _FORTIFY_SOURCE	Add security hardening to many library functions.
+			Set to 1 or 2; 2 performs stricter checks than 1.
+
+   _REENTRANT, _THREAD_SAFE
+			Obsolete; equivalent to _POSIX_C_SOURCE=199506L.
+
+   The `-ansi' switch to the GNU C compiler, and standards conformance
+   options such as `-std=c99', define __STRICT_ANSI__.  If none of
+   these are defined, or if _DEFAULT_SOURCE is defined, the default is
+   to have _POSIX_SOURCE set to one and _POSIX_C_SOURCE set to
+   200809L, as well as enabling miscellaneous functions from BSD and
+   SVID.  If more than one of these are defined, they accumulate.  For
+   example __STRICT_ANSI__, _POSIX_SOURCE and _POSIX_C_SOURCE together
+   give you ISO C, 1003.1, and 1003.2, but nothing else.
+
+   These are defined by this file and are used by the
+   header files to decide what to declare or define:
+
+   __GLIBC_USE (F)	Define things from feature set F.  This is defined
+			to 1 or 0; the subsequent macros are either defined
+			or undefined, and those tests should be moved to
+			__GLIBC_USE.
+   __USE_ISOC11		Define ISO C11 things.
+   __USE_ISOC99		Define ISO C99 things.
+   __USE_ISOC95		Define ISO C90 AMD1 (C95) things.
+   __USE_ISOCXX11	Define ISO C++11 things.
+   __USE_POSIX		Define IEEE Std 1003.1 things.
+   __USE_POSIX2		Define IEEE Std 1003.2 things.
+   __USE_POSIX199309	Define IEEE Std 1003.1, and .1b things.
+   __USE_POSIX199506	Define IEEE Std 1003.1, .1b, .1c and .1i things.
+   __USE_XOPEN		Define XPG things.
+   __USE_XOPEN_EXTENDED	Define X/Open Unix things.
+   __USE_UNIX98		Define Single Unix V2 things.
+   __USE_XOPEN2K        Define XPG6 things.
+   __USE_XOPEN2KXSI     Define XPG6 XSI things.
+   __USE_XOPEN2K8       Define XPG7 things.
+   __USE_XOPEN2K8XSI    Define XPG7 XSI things.
+   __USE_LARGEFILE	Define correct standard I/O things.
+   __USE_LARGEFILE64	Define LFS things with separate names.
+   __USE_FILE_OFFSET64	Define 64bit interface as default.
+   __USE_MISC		Define things from 4.3BSD or System V Unix.
+   __USE_ATFILE		Define *at interfaces and AT_* constants for them.
+   __USE_GNU		Define GNU extensions.
+   __USE_FORTIFY_LEVEL	Additional security measures used, according to level.
+
+   The macros `__GNU_LIBRARY__', `__GLIBC__', and `__GLIBC_MINOR__' are
+   defined by this file unconditionally.  `__GNU_LIBRARY__' is provided
+   only for compatibility.  All new code should use the other symbols
+   to test for features.
+
+   All macros listed above as possibly being defined by this file are
+   explicitly undefined if they are not explicitly defined.
+   Feature-test macros that are not defined by the user or compiler
+   but are implied by the other feature-test macros defined (or by the
+   lack of any definitions) are defined by the file.
+
+   ISO C feature test macros depend on the definition of the macro
+   when an affected header is included, not when the first system
+   header is included, and so they are handled in
+   <bits/libc-header-start.h>, which does not have a multiple include
+   guard.  Feature test macros that can be handled from the first
+   system header included are handled here.  */
+
+
+/* Undefine everything, so we get a clean slate.  */
+#undef	__USE_ISOC11
+#undef	__USE_ISOC99
+#undef	__USE_ISOC95
+#undef	__USE_ISOCXX11
+#undef	__USE_POSIX
+#undef	__USE_POSIX2
+#undef	__USE_POSIX199309
+#undef	__USE_POSIX199506
+#undef	__USE_XOPEN
+#undef	__USE_XOPEN_EXTENDED
+#undef	__USE_UNIX98
+#undef	__USE_XOPEN2K
+#undef	__USE_XOPEN2KXSI
+#undef	__USE_XOPEN2K8
+#undef	__USE_XOPEN2K8XSI
+#undef	__USE_LARGEFILE
+#undef	__USE_LARGEFILE64
+#undef	__USE_FILE_OFFSET64
+#undef	__USE_MISC
+#undef	__USE_ATFILE
+#undef	__USE_GNU
+#undef	__USE_FORTIFY_LEVEL
+#undef	__KERNEL_STRICT_NAMES
+#undef	__GLIBC_USE_DEPRECATED_GETS
+#undef	__GLIBC_USE_DEPRECATED_SCANF
+
+/* Suppress kernel-name space pollution unless user expressedly asks
+   for it.  */
+#ifndef _LOOSE_KERNEL_NAMES
+# define __KERNEL_STRICT_NAMES
+#endif
+
+/* Convenience macro to test the version of gcc.
+   Use like this:
+   #if __GNUC_PREREQ (2,8)
+   ... code requiring gcc 2.8 or later ...
+   #endif
+   Note: only works for GCC 2.0 and later, because __GNUC_MINOR__ was
+   added in 2.0.  */
+#if defined __GNUC__ && defined __GNUC_MINOR__
+# define __GNUC_PREREQ(maj, min) \
+	((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
+#else
+# define __GNUC_PREREQ(maj, min) 0
+#endif
+
+/* Similarly for clang.  Features added to GCC after version 4.2 may
+   or may not also be available in clang, and clang's definitions of
+   __GNUC(_MINOR)__ are fixed at 4 and 2 respectively.  Not all such
+   features can be queried via __has_extension/__has_feature.  */
+#if defined __clang_major__ && defined __clang_minor__
+# define __glibc_clang_prereq(maj, min) \
+  ((__clang_major__ << 16) + __clang_minor__ >= ((maj) << 16) + (min))
+#else
+# define __glibc_clang_prereq(maj, min) 0
+#endif
+
+/* Whether to use feature set F.  */
+#define __GLIBC_USE(F)	__GLIBC_USE_ ## F
+
+/* _BSD_SOURCE and _SVID_SOURCE are deprecated aliases for
+   _DEFAULT_SOURCE.  If _DEFAULT_SOURCE is present we do not
+   issue a warning; the expectation is that the source is being
+   transitioned to use the new macro.  */
+#if (defined _BSD_SOURCE || defined _SVID_SOURCE) \
+    && !defined _DEFAULT_SOURCE
+# warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"
+# undef  _DEFAULT_SOURCE
+# define _DEFAULT_SOURCE	1
+#endif
+
+/* If _GNU_SOURCE was defined by the user, turn on all the other features.  */
+#ifdef _GNU_SOURCE
+# undef  _ISOC95_SOURCE
+# define _ISOC95_SOURCE	1
+# undef  _ISOC99_SOURCE
+# define _ISOC99_SOURCE	1
+# undef  _ISOC11_SOURCE
+# define _ISOC11_SOURCE	1
+# undef  _POSIX_SOURCE
+# define _POSIX_SOURCE	1
+# undef  _POSIX_C_SOURCE
+# define _POSIX_C_SOURCE	200809L
+# undef  _XOPEN_SOURCE
+# define _XOPEN_SOURCE	700
+# undef  _XOPEN_SOURCE_EXTENDED
+# define _XOPEN_SOURCE_EXTENDED	1
+# undef	 _LARGEFILE64_SOURCE
+# define _LARGEFILE64_SOURCE	1
+# undef  _DEFAULT_SOURCE
+# define _DEFAULT_SOURCE	1
+# undef  _ATFILE_SOURCE
+# define _ATFILE_SOURCE	1
+#endif
+
+/* If nothing (other than _GNU_SOURCE and _DEFAULT_SOURCE) is defined,
+   define _DEFAULT_SOURCE.  */
+#if (defined _DEFAULT_SOURCE					\
+     || (!defined __STRICT_ANSI__				\
+	 && !defined _ISOC99_SOURCE && !defined _ISOC11_SOURCE	\
+	 && !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE	\
+	 && !defined _XOPEN_SOURCE))
+# undef  _DEFAULT_SOURCE
+# define _DEFAULT_SOURCE	1
+#endif
+
+/* This is to enable the ISO C11 extension.  */
+#if (defined _ISOC11_SOURCE \
+     || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 201112L))
+# define __USE_ISOC11	1
+#endif
+
+/* This is to enable the ISO C99 extension.  */
+#if (defined _ISOC99_SOURCE || defined _ISOC11_SOURCE \
+     || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L))
+# define __USE_ISOC99	1
+#endif
+
+/* This is to enable the ISO C90 Amendment 1:1995 extension.  */
+#if (defined _ISOC99_SOURCE || defined _ISOC11_SOURCE \
+     || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199409L))
+# define __USE_ISOC95	1
+#endif
+
+#ifdef __cplusplus
+/* This is to enable compatibility for ISO C++17.  */
+# if __cplusplus >= 201703L
+#  define __USE_ISOC11	1
+# endif
+/* This is to enable compatibility for ISO C++11.
+   Check the temporary macro for now, too.  */
+# if __cplusplus >= 201103L || defined __GXX_EXPERIMENTAL_CXX0X__
+#  define __USE_ISOCXX11	1
+#  define __USE_ISOC99	1
+# endif
+#endif
+
+/* If none of the ANSI/POSIX macros are defined, or if _DEFAULT_SOURCE
+   is defined, use POSIX.1-2008 (or another version depending on
+   _XOPEN_SOURCE).  */
+#ifdef _DEFAULT_SOURCE
+# if !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE
+#  define __USE_POSIX_IMPLICITLY	1
+# endif
+# undef  _POSIX_SOURCE
+# define _POSIX_SOURCE	1
+# undef  _POSIX_C_SOURCE
+# define _POSIX_C_SOURCE	200809L
+#endif
+
+#if ((!defined __STRICT_ANSI__					\
+      || (defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) >= 500))	\
+     && !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE)
+# define _POSIX_SOURCE	1
+# if defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 500
+#  define _POSIX_C_SOURCE	2
+# elif defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 600
+#  define _POSIX_C_SOURCE	199506L
+# elif defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 700
+#  define _POSIX_C_SOURCE	200112L
+# else
+#  define _POSIX_C_SOURCE	200809L
+# endif
+# define __USE_POSIX_IMPLICITLY	1
+#endif
+
+/* Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
+   defined in all multithreaded code.  GNU libc has not required this
+   for many years.  We now treat them as compatibility synonyms for
+   _POSIX_C_SOURCE=199506L, which is the earliest level of POSIX with
+   comprehensive support for multithreaded code.  Using them never
+   lowers the selected level of POSIX conformance, only raises it.  */
+#if ((!defined _POSIX_C_SOURCE || (_POSIX_C_SOURCE - 0) < 199506L) \
+     && (defined _REENTRANT || defined _THREAD_SAFE))
+# define _POSIX_SOURCE   1
+# undef  _POSIX_C_SOURCE
+# define _POSIX_C_SOURCE 199506L
+#endif
+
+#if (defined _POSIX_SOURCE					\
+     || (defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 1)	\
+     || defined _XOPEN_SOURCE)
+# define __USE_POSIX	1
+#endif
+
+#if defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 2 || defined _XOPEN_SOURCE
+# define __USE_POSIX2	1
+#endif
+
+#if defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 199309L
+# define __USE_POSIX199309	1
+#endif
+
+#if defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 199506L
+# define __USE_POSIX199506	1
+#endif
+
+#if defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 200112L
+# define __USE_XOPEN2K		1
+# undef __USE_ISOC95
+# define __USE_ISOC95		1
+# undef __USE_ISOC99
+# define __USE_ISOC99		1
+#endif
+
+#if defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 200809L
+# define __USE_XOPEN2K8		1
+# undef  _ATFILE_SOURCE
+# define _ATFILE_SOURCE	1
+#endif
+
+#ifdef	_XOPEN_SOURCE
+# define __USE_XOPEN	1
+# if (_XOPEN_SOURCE - 0) >= 500
+#  define __USE_XOPEN_EXTENDED	1
+#  define __USE_UNIX98	1
+#  undef _LARGEFILE_SOURCE
+#  define _LARGEFILE_SOURCE	1
+#  if (_XOPEN_SOURCE - 0) >= 600
+#   if (_XOPEN_SOURCE - 0) >= 700
+#    define __USE_XOPEN2K8	1
+#    define __USE_XOPEN2K8XSI	1
+#   endif
+#   define __USE_XOPEN2K	1
+#   define __USE_XOPEN2KXSI	1
+#   undef __USE_ISOC95
+#   define __USE_ISOC95		1
+#   undef __USE_ISOC99
+#   define __USE_ISOC99		1
+#  endif
+# else
+#  ifdef _XOPEN_SOURCE_EXTENDED
+#   define __USE_XOPEN_EXTENDED	1
+#  endif
+# endif
+#endif
+
+#ifdef _LARGEFILE_SOURCE
+# define __USE_LARGEFILE	1
+#endif
+
+#ifdef _LARGEFILE64_SOURCE
+# define __USE_LARGEFILE64	1
+#endif
+
+#if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS == 64
+# define __USE_FILE_OFFSET64	1
+#endif
+
+#if defined _DEFAULT_SOURCE
+# define __USE_MISC	1
+#endif
+
+#ifdef	_ATFILE_SOURCE
+# define __USE_ATFILE	1
+#endif
+
+#ifdef	_GNU_SOURCE
+# define __USE_GNU	1
+#endif
+
+#if defined _FORTIFY_SOURCE && _FORTIFY_SOURCE > 0
+# if !defined __OPTIMIZE__ || __OPTIMIZE__ <= 0
+#  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
+# elif !__GNUC_PREREQ (4, 1)
+#  warning _FORTIFY_SOURCE requires GCC 4.1 or later
+# elif _FORTIFY_SOURCE > 1
+#  define __USE_FORTIFY_LEVEL 2
+# else
+#  define __USE_FORTIFY_LEVEL 1
+# endif
+#endif
+#ifndef __USE_FORTIFY_LEVEL
+# define __USE_FORTIFY_LEVEL 0
+#endif
+
+/* The function 'gets' existed in C89, but is impossible to use
+   safely.  It has been removed from ISO C11 and ISO C++14.  Note: for
+   compatibility with various implementations of <cstdio>, this test
+   must consider only the value of __cplusplus when compiling C++.  */
+#if defined __cplusplus ? __cplusplus >= 201402L : defined __USE_ISOC11
+# define __GLIBC_USE_DEPRECATED_GETS 0
+#else
+# define __GLIBC_USE_DEPRECATED_GETS 1
+#endif
+
+/* GNU formerly extended the scanf functions with modified format
+   specifiers %as, %aS, and %a[...] that allocate a buffer for the
+   input using malloc.  This extension conflicts with ISO C99, which
+   defines %a as a standalone format specifier that reads a floating-
+   point number; moreover, POSIX.1-2008 provides the same feature
+   using the modifier letter 'm' instead (%ms, %mS, %m[...]).
+
+   We now follow C99 unless GNU extensions are active and the compiler
+   is specifically in C89 or C++98 mode (strict or not).  For
+   instance, with GCC, -std=gnu11 will have C99-compliant scanf with
+   or without -D_GNU_SOURCE, but -std=c89 -D_GNU_SOURCE will have the
+   old extension.  */
+#if defined __USE_GNU &&						\
+  (defined __cplusplus							\
+   ? (__cplusplus < 201103L && !defined __GXX_EXPERIMENTAL_CXX0X__)	\
+   : (!defined __STDC_VERSION__ || __STDC_VERSION__ < 199901L))
+# define __GLIBC_USE_DEPRECATED_SCANF 1
+#else
+# define __GLIBC_USE_DEPRECATED_SCANF 0
+#endif
+
+/* Get definitions of __STDC_* predefined macros, if the compiler has
+   not preincluded this header automatically.  */
+#include <stdc-predef.h>
+
+/* This macro indicates that the installed library is the GNU C Library.
+   For historic reasons the value now is 6 and this will stay from now
+   on.  The use of this variable is deprecated.  Use __GLIBC__ and
+   __GLIBC_MINOR__ now (see below) when you want to test for a specific
+   GNU C library version and use the values in <gnu/lib-names.h> to get
+   the sonames of the shared libraries.  */
+#undef  __GNU_LIBRARY__
+#define __GNU_LIBRARY__ 6
+
+/* Major and minor version number of the GNU C library package.  Use
+   these macros to test for features in specific releases.  */
+#define	__GLIBC__	2
+#define	__GLIBC_MINOR__	29
+
+#define __GLIBC_PREREQ(maj, min) \
+	((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min))
+
+/* This is here only because every header file already includes this one.  */
+#ifndef __ASSEMBLER__
+# ifndef _SYS_CDEFS_H
+#  include <sys/cdefs.h>
+# endif
+
+/* If we don't have __REDIRECT, prototypes will be missing if
+   __USE_FILE_OFFSET64 but not __USE_LARGEFILE[64]. */
+# if defined __USE_FILE_OFFSET64 && !defined __REDIRECT
+#  define __USE_LARGEFILE	1
+#  define __USE_LARGEFILE64	1
+# endif
+
+#endif	/* !ASSEMBLER */
+
+/* Decide whether we can define 'extern inline' functions in headers.  */
+#if __GNUC_PREREQ (2, 7) && defined __OPTIMIZE__ \
+    && !defined __OPTIMIZE_SIZE__ && !defined __NO_INLINE__ \
+    && defined __extern_inline
+# define __USE_EXTERN_INLINES	1
+#endif
+
+
+/* This is here only because every header file already includes this one.
+   Get the definitions of all the appropriate `__stub_FUNCTION' symbols.
+   <gnu/stubs.h> contains `#define __stub_FUNCTION' when FUNCTION is a stub
+   that will always return failure (and set errno to ENOSYS).  */
+#include <gnu/stubs.h>
+
+
+#endif	/* features.h  */

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@gnu@stubs-64.h

@@ -0,0 +1,23 @@
+/* This file is automatically generated.
+   It defines a symbol `__stub_FUNCTION' for each function
+   in the C library which is a stub, meaning it will fail
+   every time called, usually setting errno to ENOSYS.  */
+
+#ifdef _LIBC
+ #error Applications may not define the macro _LIBC
+#endif
+
+#define __stub___compat_bdflush
+#define __stub_chflags
+#define __stub_fattach
+#define __stub_fchflags
+#define __stub_fdetach
+#define __stub_getmsg
+#define __stub_gtty
+#define __stub_lchmod
+#define __stub_putmsg
+#define __stub_revoke
+#define __stub_setlogin
+#define __stub_sigreturn
+#define __stub_sstk
+#define __stub_stty

day4/1/.ccls-cache/@@home@armin@dev@playground@aoc-2019@day4@1/@usr@include@gnu@stubs.h

@@ -0,0 +1,14 @@
+/* This file is automatically generated.
+   This file selects the right generated file of `__stub_FUNCTION' macros
+   based on the architecture being compiled for.  */
+
+
+#if !defined __x86_64__
+# include <gnu/stubs-32.h>
+#endif
+#if defined __x86_64__ && defined __LP64__
+# include <gnu/stubs-64.h>
+#endif
+#if defined __x86_64__ && defined __ILP32__
+# include <gnu/stubs-x32.h>
+#endif