Problem: A maze is composed of a grid of H \times W squares - H vertical, W horizontal.  The square at the i-th row from the top and the j-th column from the left - (i,j) \- is a wall if S_{ij} is `#` and a road if S_{ij} is `.`.  There is a magician in (C_h,C_w). He can do the following two kinds of moves:    * Move A: Walk to a road square that is vertically or horizontally adjacent to the square he is currently in.   * Move B: Use magic to warp himself to a road square in the 5\times 5 area centered at the square he is currently in.  In either case, he cannot go out of the maze.  At least how many times does he need to use the magic to reach (D_h, D_w)?

Submission attempts (in order):
from collections import deque

def main():
    h, w = map(int, input().split())
    ch, cw = map(int, input().split())
    ch -= 1
    cw -= 1
    dh, dw = map(int, input().split())
    dh -= 1
    dw -= 1
    maze = [input() for i in range(h)]
    visited = [[-1]*w for j in range(h)]
    
    def maze_solver(maze, visited, sy, sx, gy, gx):
        mv = [[1, 0], [-1, 0], [0, 1], [0, -1]]
        q = deque([[sy, sx]])
        visited[sy][sx] = 0 
        _yx = list()
        _yx.append([sy, sx])
        while q:
            y, x = q.popleft()
            if y == gy and x == gx:
                ans = visited[y][x]
                return ans, visited, _yx
            for i, j in mv:
                if (0 <= y + i < h) and (0 <= x + j < w):  
                    ny = y+i
                    nx = x+j
                    if visited[ny][nx] != -1:
                        continue
                    if maze[ny][nx] == '.':
                        visited[ny][nx] = visited[y][x] + 1 
                        q.append([ny, nx])
                        _yx.append([ny, nx])
                else:
                    continue
        _yx = list(map(list, set(map(tuple, _yx))))
        return -1, visited, _yx

    def telepo(visited, _yx, h, w):
        n_yx = list()
        for y, x in _yx:
            for ny in range(-2, 3):
                for nx in range(-2, 3):
                    if 0 < y+ny < h and \
                        0 < x+nx < w and \
                        visited[y+ny][x+nx] == -1 and \
                        maze[y+ny][x+nx] != '#': 
                        n_yx.append([y+ny, x+nx])
        n_yx_s = list(map(list, set(map(tuple, n_yx))))
        return n_yx_s
    
    telepo_cnt = 0
    ans, visited, _yx = maze_solver(maze, visited, ch, cw, dh, dw)
    if ans != -1:
        print(telepo_cnt)
        exit()
    else:
        n_yx_s = telepo(visited, _yx, h, w)
        while len(n_yx_s) > 0:
            telepo_cnt += 1
            for ny, nx in n_yx_s:
                ans, visted = maze_solver(maze, visited, ny, nx, dh, dw)
                if ans != -1:
                    print(telepo_cnt)
                    exit()
    print(-1)
                        
if __name__ == '__main__':
    main()

def main():
    from collections import deque
    import sys
    input = sys.stdin.readline
    h, w = map(int, input().split())
    ch, cw = map(int, input().split())
    dh, dw = map(int, input().split())
    
    
    
    maze = ['#' * (w+4)]
    maze.append('#' * (w+4))
    for _ in range(h):
        maze.append('##' + input()[:-1] + '##')
    maze.append('#' * (w+4))
    maze.append('#' * (w+4))
    visited = [[-1] * (w+4) for _ in range(h+4)]
    for i in range(h+4):
        for j in range(w+4):
            if maze[i][j] == '#':
                visited[i][j] = -2
    
    ch += 1
    cw += 1
    dh += 1
    dw += 1
    visited[ch][cw] = 0
    walk = [[1, 0], [-1, 0], [0, 1], [0, -1]]
    telepo = [[i,j] for i in range(-2, 3) for j in range(-2, 3)]

    q_walk = deque([[ch, cw]])
    q_telepo = deque([])
    while q_walk:
        yw, xw = q_walk.popleft()
        
        q_telepo.append([yw, xw])
        for i, j in walk:
            ny, nx = yw + i, xw + j
            # if ny < 0 or h <= ny or nx < 0 or w <= nx:
            #     continue
            if visited[ny][nx] == -1:
                
                visited[ny][nx] = visited[yw][xw]
                q_walk.append([ny, nx])
        
        if len(q_walk) == 0:
            while q_telepo:
                yt, xt = q_telepo.popleft()
                for i, j in telepo:
                    my, mx = yt + i, xt + j
                    # if my < 0 or h <= my or mx < 0 or w <= mx:
                    #     continue
                    
                    
                    if visited[my][mx] == -1:
                        visited[my][mx] = visited[yt][xt] + 1
                        q_walk.append([my, mx])
    print(visited[dh][dw])

if __name__ == '__main__':
    main()


Verdicts: Runtime Error

Accepted