add: day04: part2

2025/day04/part2.py

@@ -0,0 +1,35 @@
+text: str
+
+with open("input.txt") as f:
+    text = f.read()
+
+total: int  = 0
+
+def eval(lines: list[str], x: int, y: int):
+    start_x = max(x - 1, 0)
+    stop_x = min(len(lines[0]), x + 2)
+    start_y = max(y - 1, 0)
+    stop_y = min(len(lines[0]), y + 2)
+    
+    count: int = 0
+
+    for line in lines[start_y:stop_y]:
+        count += line[start_x:stop_x].count("@")
+    
+    return ((count - 1) < 4)
+    
+
+lines = [[c for c in line] for line in text.splitlines()]
+
+bozo = 1
+while bozo:
+    bozo = 0
+    for y, line in enumerate(lines):
+        for x, c in enumerate(line):
+            if c == "@":
+                if (eval(lines, x, y)):
+                    total += 1
+                    line[x] = "x"
+                    bozo = 1
+
+print(total)