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