2021: d07: ex2: add solution

2021/d07/ex2/ex2.py

@@ -0,0 +1,27 @@
+#!/usr/bin/env python
+
+import sys
+from math import ceil, floor
+from typing import List
+
+
+def solve(input: List[str]) -> int:
+    def fuel(dist: int) -> int:
+        return dist * (dist + 1) // 2
+
+    nums = list(int(n) for n in input[0].split(","))
+    mean = sum(nums) / len(nums)
+
+    upper = sum(fuel(abs(n - ceil(mean))) for n in nums)
+    lower = sum(fuel(abs(n - floor(mean))) for n in nums)
+
+    return min(upper, lower)
+
+
+def main() -> None:
+    input = [line.strip() for line in sys.stdin.readlines()]
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()