2019: d08: ex1: add solution

2019/d08/ex1/ex1.py

@@ -0,0 +1,25 @@
+#!/usr/bin/env python
+
+import sys
+
+
+def main() -> None:
+    COLUMNS = 25
+    ROWS = 6
+    digits = [int(d) for d in str(int(sys.stdin.read()))]
+
+    assert len(digits) % (COLUMNS * ROWS) == 0  # Sanity check
+    LAYERS = int(len(digits) / (COLUMNS * ROWS))
+
+    layers = [
+        [digits.pop(0) for __ in range(COLUMNS) for __ in range(ROWS)]
+        for __ in range(LAYERS)
+    ]
+
+    least_zeros = min(layers, key=lambda l: sum(1 for d in l if d == 0))
+
+    print(sum(1 for d in least_zeros if d == 1) * sum(1 for d in least_zeros if d == 2))
+
+
+if __name__ == "__main__":
+    main()