Add solution to 2024-12-11

Author: fuglede

2024/day11/solutions.py

@@ -0,0 +1,19 @@
+from collections import Counter
+
+with open("input") as f:
+    stones = Counter(map(int, f.read().split()))
+
+for blinks in range(1, 76):
+    new_stones = Counter()
+    for n, num_stone in stones.items():
+        mid, rem = divmod(len(s := str(n)), 2)
+        if n == 0:
+            new_stones[1] += num_stone
+        elif rem == 0:
+            for m in s[:mid], s[mid:]:
+                new_stones[int(m)] += num_stone
+        else:
+            new_stones[2024 * n] += num_stone
+    stones = new_stones
+    if blinks in (25, 75):
+        print(sum(new_stones.values()))