11.1, 11.2 python fast

11/11.py

@@ -0,0 +1,28 @@
+from collections import defaultdict
+
+data = list(map(int, open("input.txt").read().strip().split()))
+
+def rules(x):
+    if x==0:
+        return [1]
+    s = str(x)
+    if len(s)%2==0:
+        return [int(s[:len(s)//2]), int(s[len(s)//2:])]
+    return [x*2024]
+
+
+def f(data, n):
+    d = defaultdict(int)
+    for x in data:
+        d[x] += 1
+    for i in range(n):
+        t = defaultdict(int)
+        for j, k in d.items():
+            for x in rules(j):
+                t[x] += k
+        d = t
+    return sum(d.values())
+
+assert f(data, 25)==203609
+print(f(data, 25))
+print(f(data, 75))