Add solution to 2025-12-06

Author: fuglede

2025/day06/solutions.py

@@ -0,0 +1,17 @@
+from math import prod
+
+with open("input") as f:
+    *nums_lines, ops_line, _ = f.read().split("\n")
+
+data = [(i, op) for i, x in enumerate(ops_line) if (op := {"+": sum, "*": prod}.get(x))]
+starts, ops = zip(*data)
+ends = [i - 1 for i in starts[1:]] + [None]
+
+# Part 1
+nums1 = [[line[start:end] for line in nums_lines] for start, end in zip(starts, ends)]
+
+# Part 2
+nums2 = (map("".join, zip(*ns)) for ns in nums1)
+
+for nums in (nums1, nums2):
+    print(sum(op(map(int, col)) for op, col in zip(ops, nums)))