2024 d25: Encode (r, c) as r * h + c

mebeim · mebeim · commit 1f987b4c178d · 2024-12-25T06:39:49.000+01:00
diff --git a/2024/solutions/day25.py b/2024/solutions/day25.py
@@ -4,9 +4,11 @@
 
 
 def grid_to_set(grid):
+	h = len(grid)
+
 	points = set()
 	for r, row in enumerate(grid):
-		points.update((r, c) for c, char in enumerate(row) if char == '#')
+		points.update(r * h + c for c, char in enumerate(row) if char == '#')
 
 	return points, row == '#####'
 
