1 files changed, 29 insertions, 0 deletions
diff --git a/2024/04/python.py b/2024/04/python.py
new file mode 100755
index 0000000..fe5021b
--- /dev/null
+++ b/2024/04/python.py
@@ -0,0 +1,29 @@
+#!/usr/bin/env python3
+
+from fileinput import input
+
+grid = {
+    complex(idx, idy): c
+    for idy, line in enumerate(input())
+    for idx, c in enumerate(line.strip())
+}
+dirs = {complex(dx, dy) for dx in [-1, 0, 1] for dy in [-1, 0, 1]}
+
+
+def xmas(x, v):
+    return all(grid.get(x + n * v) == c for n, c in enumerate("XMAS"))
+
+
+def x_mas(x, v):
+    return (
+        grid.get(x) == "A"
+        and grid.get(x + v) == grid.get(x + 1j * v) == "M"
+        and grid.get(x - v) == grid.get(x - 1j * v) == "S"
+    )
+
+
+silver = sum(xmas(x, v) for x in grid.keys() for v in dirs)
+gold = sum(x_mas(x, v) for x in grid.keys() for v in dirs if abs(v) > 1)
+
+print("silver:", silver)
+print("gold:", gold)