restructure zeta/** to storage/zeta/**

storage/zeta/py/completed/26533.py

@@ -0,0 +1,38 @@
+import sys
+
+input = sys.stdin.readline
+
+
+class TractorPath:
+    def __init__(self, N: int, arr: list[list[int]]):
+        self.N = N
+        self.arr = arr
+        self.vis = [[0 for _ in range(N)] for _ in range(N)]
+
+    def isValid(self) -> bool:
+        D = [(0, 0)]
+        while D:
+            x, y = D.pop()
+            if not self.vis[x][y]:
+                self.vis[x][y] = 1
+            else:
+                continue
+            if x == self.N - 1 and y == self.N - 1:
+                return True
+            if x != self.N - 1 and not self.arr[x + 1][y]:
+                D.append((x + 1, y))
+            if y != self.N - 1 and not self.arr[x][y + 1]:
+                D.append((x, y + 1))
+        return False
+
+    def solve(self) -> str:
+        return "Yes" if self.isValid() else "No"
+
+
+if __name__ == "__main__":
+    N = int(input())
+    arr = [
+        list(map(lambda s: 0 if s == "." else 1, input().rstrip())) for _ in range(N)
+    ]
+    solver = TractorPath(N, arr)
+    print(solver.solve())