feat: day 4.1

2025/Day4/src/main.py

@@ -0,0 +1,24 @@
+def count_neighbours(x: int, y: int, grid: [str]) -> int:
+    count = 0
+    for y_i in range(max(y-1, 0), min(y+2, len(grid))):
+        for x_i in range(max(x-1, 0), min(x+2, len(grid[y_i]))):
+            if x_i == x and y_i == y:
+                continue
+            if grid[y_i][x_i] == '@':
+                count += 1
+    return count
+
+
+if __name__ == '__main__':
+    with open("input.txt", "r") as f:
+        grid = f.read().split("\n")
+
+    total = 0
+    for y, row in enumerate(grid):
+        for x, symbol in enumerate(row):
+            if symbol != '@':
+                continue
+            if count_neighbours(x, y, grid) < 4:
+                total += 1
+
+    print(total)