Day 11

day11.py

@@ -0,0 +1,50 @@
+#!/usr/bin/env python3
+
+import functools
+
+stones = []
+with open("day11") as f:
+    l = f.read().split(' ')
+    stones = list(map(int, l))
+
+# 1
+def part1():
+    for i in range(25):
+        s = 0
+        while s < len(stones):
+            match stones[s]:
+                case 0:
+                    stones[s] = 1
+                    s += 1
+                case num if len(str(num))%2==0:
+                    l = len(str(num))
+                    stones[s] = int(str(num)[:l//2])
+                    stones.insert(s+1, int(str(num)[-l//2:]))
+                    s += 2
+                case _:
+                    stones[s] = stones[s] * 2024
+                    s += 1
+
+    print(len(stones))
+
+# 2
+@functools.cache
+def memo_me(stone, its):
+    if its == 0: return 1
+
+    if stone == 0:
+        return memo_me(1, its-1)
+    if len(str(stone))%2==0:
+        l = len(str(stone))
+        return memo_me(int(str(stone)[:l//2]), its-1) + memo_me(int(str(stone)[-l//2:]), its-1)
+    else:
+        return memo_me(stone*2024, its-1)
+
+
+def part2():
+    num_stones = 0
+    for stone in stones:
+        num_stones += memo_me(stone, 75)
+    print(num_stones)
+
+part2()