Solve day4

day4/part1.py

@@ -0,0 +1,28 @@
+FILE = "input.txt"
+
+options = [
+    (-1, -1), (-1, 0), (0, -1), (1, 1), (1, 0), (0, 1), (-1, 1), (1, -1)
+]
+
+def main():
+    accessible = 0
+    grid = [list(line.strip()) for line in open(FILE)]
+    for i in range(len(grid)):
+        for j in range(len(grid[0])):
+            if grid[i][j] != '@': continue
+            nearby = [
+                (i + x, j + y)
+                for (x, y) in options
+                if 0 <= i+x < len(grid) and 0 <= j+y < len(grid[0])
+            ]
+            nearbyRolls = [
+                grid[x][y]
+                for (x, y) in nearby
+                if grid[x][y] == '@'
+            ]
+            if len(nearbyRolls) < 4: accessible += 1
+    return accessible
+
+
+if __name__ == "__main__":
+    print(main())