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
h, w = map(int,input().split())
ch, cw = map(int,input().split())
dh, dw = map(int,input().split())

M = ['##' + input() + '##' for _ in range(h)]
for i in range(2):
    M.insert(0,'#'*(w+4))
    M.append('#'*(w+4))

INF = float('inf')
cost = [[INF for _ in range(w+4)] for _ in range(h+4)]
cost0 = deque()
ans = -1

cost0.append((ch+1, cw+1, 0))
cost[ch+1][cw+1] = 0

move = [(1,0),(0,1),(-1,0),(0,-1)]
warp = [(i,j) for i in range(-2,3) for j in range(-2,3) if (i,j) not in [(0,0)] + move]

cost1 = deque()

while cost0:
    h, w, c = cost0.popleft()
    cost1.append((h, w, c))
    
    for i,j in move:
        dh = h + i
        dw = w + j
        if M[dh][dw] == '.' and c < cost[dh][dw]: 
            cost[dh][dw] = c
            cost0.appendleft((dh, dw, cost[dh][dw]))
    
    if len(cost0) == 0:
        while cost1:
            h, w, c = cost1.popleft()
            for i,j in warp:
                dh = h + i
                dw = w + j
                if S[dh][dw] == '.' and c+1 < cost[dh][dw]:  
                    cost[dh][dw] = c+1
                    cost0.append((dh, dw, cost[dh][dw]))
    if cost[dh+1][dw+1] != INF:
        ans = cost[dh+1][dw+1]

print(ans)

from collections import deque
def solve():  
    h, w = map(int,input().split())
    ch, cw = map(int,input().split())
    Dh, Dw = map(int,input().split())
    
    M = ['##' + input() + '##' for _ in range(h)]
    for i in range(2):
        M.insert(0,'#'*(w+4))
        M.append('#'*(w+4))
    
    INF = float('inf')
    cost = [[INF for _ in range(w+4)] for _ in range(h+4)]
    cost0 = deque()
    ans = -1
    
    cost0.append((ch+1, cw+1, 0))
    cost[ch+1][cw+1] = 0
    
    move = [(1,0),(0,1),(-1,0),(0,-1)]
    warp = [(i,j) for i in range(-2,3) for j in range(-2,3) if (i,j) not in [(0,0)] + move]
    
    cost1 = deque()
    
    while cost0:
        h, w, c = cost0.popleft()
        cost1.append((h, w, c))
        
        for i,j in move:
            dh = h + i
            dw = w + j
            if M[dh][dw] == '.' and c < cost[dh][dw]: 
                cost[dh][dw] = c
                cost0.appendleft((dh, dw, cost[dh][dw]))
        
        if len(cost0) == 0:
            while cost1:
                h, w, c = cost1.popleft()
                for i,j in warp:
                    dh = h + i
                    dw = w + j
                    if M[dh][dw] == '.' and c+1 < cost[dh][dw]:  
                        cost[dh][dw] = c+1
                        cost0.append((dh, dw, cost[dh][dw]))
        if cost[Dh+1][Dw+1] != INF:
            ans = cost[Dh+1][Dw+1]
    
    print(ans)

if __name__ == "__main__":
    solve()
                    

Verdicts: Runtime Error

Accepted