def walk(i, j, pos=[(0, 0)]): if (j + 1 < m) and (maze[i][j + 1] == 0): if (i, j + 1) not in pos: walk(i, j + 1, pos + [(i, j + 1)]) if (j - 1 >= 0) and (maze[i][j - 1] == 0): if (i, j - 1) not in pos: walk(i, j - 1, pos + [(i, j - 1)]) if (i...