Add solution to 2024-12-19

Author: fuglede

2024/day19/solutions.py

@@ -0,0 +1,24 @@
+from functools import cache
+
+
+with open("input") as f:
+    ls = f.read().strip().split("\n")
+
+stripes, _, *patterns = ls
+stripes = stripes.split(", ")
+
+
+@cache
+def is_possible(pattern, op):
+    if not pattern:
+        return 1
+    return op(
+        is_possible(pattern[len(stripe) :], op)
+        for stripe in stripes
+        if pattern.startswith(stripe)
+    )
+
+
+# Part 1 + 2
+for op in any, sum:
+    print(sum(is_possible(pattern, op) for pattern in patterns))