Problem:


Score : 400 points

Problem Statement

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)?

Constraints

1 \leq H,W \leq 10^3

1 \leq C_h,D_h \leq H

1 \leq C_w,D_w \leq W

S_{ij} is # or ..

S_{C_h C_w} and S_{D_h D_w} are ..

(C_h,C_w) \neq (D_h,D_w)

Input

Input is given from Standard Input in the following format:

H W
C_h C_w
D_h D_w
S_{11}\ldots S_{1W}
\vdots
S_{H1}\ldots S_{HW}

Output

Print the minimum number of times the magician needs to use the magic. If he cannot reach (D_h,D_w), print -1 instead.

Sample Input 1

4 4
1 1
4 4
..#.
..#.
.#..
.#..

Sample Output 1

1

For example, by walking to (2,2) and then using the magic to travel to (4,4), just one use of magic is enough.

Note that he cannot walk diagonally.

Sample Input 2

4 4
1 4
4 1
.##.
####
####
.##.

Sample Output 2

-1

He cannot move from there.

Sample Input 3

4 4
2 2
3 3
....
....
....
....

Sample Output 3

0

No use of magic is needed.

Sample Input 4

4 5
1 2
2 5
#.###
####.
#..##
#..##

Sample Output 4

2



Sample input:
4 4
1 1
4 4
..#.
..#.
.#..
.#..


Sample output:
1

Submission status: Wrong Answer

Solution code:
# -*- coding: utf-8 -*-
import numpy as np
import queue
    
def BFS(c,t,Num):
    q = queue.Queue()
    q.put(c)
    
    while not q.empty(): 
        n = q.get()
        if t[n[0] + 1][n[1]] != -1 and t[n[0] + 1][n[1]] == 9999:
            q.put([n[0] + 1, n[1]])
            t[n[0] + 1][n[1]] = Num
    
        if t[n[0]][n[1] + 1] != -1 and t[n[0]][n[1] + 1] == 9999:
            q.put([n[0], n[1] + 1])
            t[n[0]][n[1] + 1] = Num
        
        if t[n[0] - 1][n[1]] != -1 and t[n[0] - 1][n[1]] == 9999:
            q.put([n[0] - 1, n[1] ])
            t[n[0] - 1][ n[1] ] = Num

        if t[n[0]][n[1] - 1] != -1 and t[n[0]][n[1] - 1] == 9999:
            q.put([n[0],n[1] - 1])
            t[n[0]][n[1] - 1] = Num  


def SearchNum(t, Num):
    q = queue.Queue()
    
    for i in range(H + 4):
        for j in range(W + 4):
            if t[i][j] == Num:
                q.put([i,j])    
        
    return q

def Warp(c,t,Num):
    for i in range(c[0]-2,c[0]+3):
        for j in range(c[1]-2,c[1]+3):
            if t[i][j] == 9999:
                t[i][j] = Num
    
H, W = map(int,input().split())
C = list(map(int,input().split()))
D = list(map(int,input().split()))
S = []
for i in range(H):    
  S.append(list(input()))

C[0] -= 1
C[1] -= 1
D[0] -= 1
D[1] -= 1

T = np.full([H + 4,W + 4],-1)

for i in range(H):
    for j in range(W):
        if S[i][j] == '#':
            T[i+2][j+2] = -1
        if S[i][j] == '.':
            T[i+2][j+2] = 9999
                
T[C[0] + 2][C[1] + 2] = 0
BFS([C[0] + 2,C[1] + 2],T,0)
print(T)
count = 0
while True:
    q_warp = SearchNum(T,count)
    count += 1
    if q_warp.empty():
        break
    
    while not q_warp.empty():
        n = q_warp.get()
        Warp([n[0],n[1]],T,count)
        
    q_BFS = SearchNum(T,count)
    while not q_BFS.empty():
        n2 = q_BFS.get()
        BFS(n2,T,count)
        
    if count > 1500:
        break
    if T[D[0] + 2][D[1] + 2] != 9999:
        break
    

if T[D[0] + 2][D[1] + 2] != 9999:
    print(T[D[0] + 2][D[1] + 2])
else:
    print(-1)            

print(T)

Submission status: Wrong Answer

Solution code:
# -*- coding: utf-8 -*-
import numpy as np
import queue
    
def BFS(c,t,Num):
    q = queue.Queue()
    q.put(c)
    
    while not q.empty(): 
        n = q.get()
        if t[n[0] + 1][n[1]] != -1 and t[n[0] + 1][n[1]] == 9999 :
            q.put([n[0] + 1, n[1]])
            t[n[0] + 1][n[1]] = Num
    
        if t[n[0]][n[1] + 1] != -1 and t[n[0]][n[1] + 1] == 9999:
            q.put([n[0], n[1] + 1])
            t[n[0]][n[1] + 1] = Num
        
        if t[n[0] - 1][n[1]] != -1 and t[n[0] - 1][n[1]] == 9999:
            q.put([n[0] - 1, n[1] ])
            t[n[0] - 1][ n[1] ] = Num

        if t[n[0]][n[1] - 1] != -1 and t[n[0]][n[1] - 1] == 9999:
            q.put([n[0],n[1] - 1])
            t[n[0]][n[1] - 1] = Num  


def SearchNum(t, Num):
    q = queue.Queue()
    
    for i in range(H + 4):
        for j in range(W + 4):
            if t[i][j] == Num:
                q.put([i,j])    
        
    return q

def Warp(c,t,Num):
    for i in range(c[0]-2,c[0]+3):
        for j in range(c[1]-2,c[1]+3):
            if t[i][j] == 9999:
                t[i][j] = Num
    
H, W = map(int,input().split())
C = list(map(int,input().split()))
D = list(map(int,input().split()))
S = []
for i in range(H):    
  S.append(list(input()))

C[0] -= 1
C[1] -= 1
D[0] -= 1
D[1] -= 1

T = np.full([H + 4,W + 4],-1)

for i in range(H):
    for j in range(W):
        if S[i][j] == '#':
            T[i+2][j+2] = -1
        if S[i][j] == '.':
            T[i+2][j+2] = 9999
                
T[C[0] + 2][C[1] + 2] = 0
BFS([C[0] + 2,C[1] + 2],T,0)
print(T)
count = 0
while True:
    q_warp = SearchNum(T,count)
    count += 1
    if q_warp.empty():
        break
    
    while not q_warp.empty():
        n = q_warp.get()
        Warp([n[0],n[1]],T,count)
        
    q_BFS = SearchNum(T,count)
    while not q_BFS.empty():
        n2 = q_BFS.get()
        BFS(n2,T,count)
        
    if count > 1000:
        break
    if T[D[0] + 2][D[1] + 2] != 9999:
        break
    

if T[D[0] + 2][D[1] + 2] != 9999:
    print(T[D[0] + 2][D[1] + 2])
else:
    print(-1)            

print(T)

Submission status: Wrong Answer

Solution code:
import sys

# D - Wizard in Maze
def get_index(s):
	return int(s) - 1


def search(h, w):
	global que
	global next_que

	if can_reach(h, w):
		que.append([h, w])


def can_reach(h, w):
	global H
	global W
	global maze

	if h < 0 or h >= H or w < 0 or w >= W:
		return False
	elif maze[h][w] == '#':
		return False
	elif is_reached[h][w]:
		return False
	else:
		return True


from collections import deque
import copy

H, W = map(int, input().split())
Ch, Cw = map(get_index, input().split())
Dh, Dw = map(get_index, input().split())

maze = []

for _ in range(H):
	maze.append(input())

costs = [[-1] * W for _ in range(H)]
is_reached = [[False] * W for _ in range(H)]

next_que = deque()
next_que.append([Ch, Cw])

que = copy.deepcopy(next_que)

# コスト0で到達可能なマスを列挙
while len(que) > 0:
	h, w = que.popleft()
	costs[h][w] = 0
	is_reached[h][w] = True

	# 上下左右に隣接するマスを探索
	search(h + 1, w)
	search(h - 1, w)
	search(h, w + 1)
	search(h, w - 1)

if is_reached[Dh][Dw]:
	print(0)
else:
  # コスト(ワープ魔法を使った回数)
  mp = 1

  while len(next_que) > 0:
    que = copy.deepcopy(next_que)
    next_que.clear()

		# コストiで到達可能なマスを列挙
    while len(que) > 0:
      h, w = que.popleft()
      costs[h][w] = mp
      is_reached[h][w] = True

			# ワープ魔法で移動できるマスを探索
      for i in range(-2, 3):
        search(h - 2, w + i)
        search(h + 2, w + i)

      for i in range(-2, 3):
        if i != 0:
          search(h - 1, w + i)
          search(h + 1, w + i)

      search(h, w + 2)
      search(h, w - 2)

    if is_reached[Dh][Dw]:
      print(mp)
      exit()
    else:
      mp += 1

  print(-1)

Submission status: Wrong Answer

Solution code:
import numpy as np
import queue
    
def BFS(c,t,Num):
    q = queue.Queue()
    q.put(c)
    
    while not q.empty(): 
        n = q.get()
        if t[n[0] + 1][n[1]] != -1 and t[n[0] + 1][n[1]] == 9999:
            q.put([n[0] + 1, n[1]])
            t[n[0] + 1][n[1]] = Num
    
        if t[n[0]][n[1] + 1] != -1 and t[n[0]][n[1] + 1] == 9999:
            q.put([n[0], n[1] + 1])
            t[n[0]][n[1] + 1] = Num
        
        if t[n[0] - 1][n[1]] != -1 and t[n[0] - 1][n[1]] == 9999:
            q.put([n[0] - 1, n[1] ])
            t[n[0] - 1][ n[1] ] = Num

        if t[n[0]][n[1] - 1] != -1 and t[n[0]][n[1] - 1] == 9999:
            q.put([n[0],n[1] - 1])
            t[n[0]][n[1] - 1] = Num  


def SearchNum(t, Num):
    q = queue.Queue()
    
    for i in range(H + 4):
        for j in range(W + 4):
            if t[i][j] == Num:
                q.put([i,j])    
        
    return q

def Warp(c,t,Num):
    for i in range(c[0]-2,c[0]+3):
        for j in range(c[1]-2,c[1]+3):
            if t[i][j] == 9999:
                t[i][j] = Num
    
H, W = map(int,input().split())
C = list(map(int,input().split()))
D = list(map(int,input().split()))
S = []
for i in range(H):    
  S.append(list(input()))

C[0] -= 1
C[1] -= 1
D[0] -= 1
D[1] -= 1

T = np.full([H + 4,W + 4],-1)

for i in range(H):
    for j in range(W):
        if S[i][j] == '#':
            T[i+2][j+2] = -1
        if S[i][j] == '.':
            T[i+2][j+2] = 9999
                
T[C[0] + 2][C[1] + 2] = 0
BFS([C[0] + 2,C[1] + 2],T,0)

count = 0
while True:
    q_warp = SearchNum(T,count)
    count += 1
    if q_warp.empty():
        break
    
    while not q_warp.empty():
        n = q_warp.get()
        Warp([n[0],n[1]],T,-99)
        
    q_BFS = SearchNum(T,-99)
    while not q_BFS.empty():
        n2 = q_BFS.get()
        if T[n2[0]][n2[1]] == -99:
            BFS(n2,T,count)
        
    if count > 2000:
        break
    if T[D[0] + 2][D[1] + 2] != 9999:
        break


if T[D[0] + 2][D[1] + 2] != 9999:
    print(T[D[0] + 2][D[1] + 2])
else:
    print(-1)

Submission status: Wrong Answer

Solution code:
# -*- coding: utf-8 -*-
import numpy as np
import queue
    
def BFS(c,t,Num):
    q = queue.Queue()
    q.put(c)
    
    while not q.empty(): 
        n = q.get()
        if t[n[0] + 1][n[1]] != -1 and t[n[0] + 1][n[1]] == 9999:
            q.put([n[0] + 1, n[1]])
            t[n[0] + 1][n[1]] = Num
    
        if t[n[0]][n[1] + 1] != -1 and t[n[0]][n[1] + 1] == 9999:
            q.put([n[0], n[1] + 1])
            t[n[0]][n[1] + 1] = Num
        
        if t[n[0] - 1][n[1]] != -1 and t[n[0] - 1][n[1]] == 9999:
            q.put([n[0] - 1, n[1] ])
            t[n[0] - 1][ n[1] ] = Num

        if t[n[0]][n[1] - 1] != -1 and t[n[0]][n[1] - 1] == 9999:
            q.put([n[0],n[1] - 1])
            t[n[0]][n[1] - 1] = Num  


def SearchNum(t, Num):
    q = queue.Queue()
    
    for i in range(H + 4):
        for j in range(W + 4):
            if t[i][j] == Num:
                q.put([i,j])    
        
    return q

def Warp(c,t,Num):
    for i in range(c[0]-2,c[0]+3):
        for j in range(c[1]-2,c[1]+3):
            if t[i][j] == 9999:
                t[i][j] = Num
    
H, W = map(int,input().split())
C = list(map(int,input().split()))
D = list(map(int,input().split()))
S = []
for i in range(H):    
  S.append(list(input()))

C[0] -= 1
C[1] -= 1
D[0] -= 1
D[1] -= 1

T = np.full([H + 4,W + 4],-1)

for i in range(H):
    for j in range(W):
        if S[i][j] == '#':
            T[i+2][j+2] = -1
        if S[i][j] == '.':
            T[i+2][j+2] = 9999
                
T[C[0] + 2][C[1] + 2] = 0
BFS([C[0] + 2,C[1] + 2],T,0)

count = 0
while True:
    q_warp = SearchNum(T,count)
    count += 1
    if q_warp.empty():
        break
    
    while not q_warp.empty():
        n = q_warp.get()
        Warp([n[0],n[1]],T,count)
        
    q_BFS = SearchNum(T,count)
    while not q_BFS.empty():
        n2 = q_BFS.get()
        BFS(n,T,count)
        
    if count > 2000:
        break
    if T[D[0] + 2][D[1] + 2] != 9999:
        break


if T[D[0] + 2][D[1] + 2] != 9999:
    print(T[D[0] + 2][D[1] + 2])
else:
    print(-1)

Submission status: Wrong Answer

Solution code:
import numpy as np
import queue
    
def BFS(c,t,Num):
    q = queue.Queue()
    q.put(c)
    
    while not q.empty(): 
        n = q.get()
        if t[n[0] + 1][n[1]] != -1 and t[n[0] + 1][n[1]] == 9999:
            q.put([n[0] + 1, n[1]])
            t[n[0] + 1][n[1]] = Num
    
        if t[n[0]][n[1] + 1] != -1 and t[n[0]][n[1] + 1] == 9999:
            q.put([n[0], n[1] + 1])
            t[n[0]][n[1] + 1] = Num
        
        if t[n[0] - 1][n[1]] != -1 and t[n[0] - 1][n[1]] == 9999:
            q.put([n[0] - 1, n[1] ])
            t[n[0] - 1][ n[1] ] = Num

        if t[n[0]][n[1] - 1] != -1 and t[n[0]][n[1] - 1] == 9999:
            q.put([n[0],n[1] - 1])
            t[n[0]][n[1] - 1] = Num  


def SearchNum(t, Num):
    q = queue.Queue()
    
    for i in range(H + 4):
        for j in range(W + 4):
            if t[i][j] == Num:
                q.put([i,j])    
        
    return q

def Warp(c,t,Num):
    for i in range(c[0]-2,c[0]+3):
        for j in range(c[1]-2,c[1]+3):
            if t[i][j] == 9999:
                t[i][j] = Num
    
H, W = map(int,input().split())
C = list(map(int,input().split()))
D = list(map(int,input().split()))
S = []
for i in range(H):    
  S.append(list(input()))

C[0] -= 1
C[1] -= 1
D[0] -= 1
D[1] -= 1

T = np.full([H + 4,W + 4],-1)

for i in range(H):
    for j in range(W):
        if S[i][j] == '#':
            T[i+2][j+2] = -1
        if S[i][j] == '.':
            T[i+2][j+2] = 9999
                
T[C[0] + 2][C[1] + 2] = 0
BFS([C[0] + 2,C[1] + 2],T,0)

count = 0
while True:
    q_warp = SearchNum(T,count)
    count += 1
    if q_warp.empty():
        break
    
    while not q_warp.empty():
        n = q_warp.get()
        Warp([n[0],n[1]],T,count)
        
    q_BFS = SearchNum(T,count)
    while not q_BFS.empty():
        n2 = q_BFS.get()
        BFS(n,T,count)
        
    if count > 1000:
        break
    if T[D[0] + 2][D[1] + 2] != 9999:
        break


if T[D[0] + 2][D[1] + 2] != 9999:
    print(T[D[0] + 2][D[1] + 2])
else:
    print(-1)

Submission status: Wrong Answer

Solution code:
# -*- coding: utf-8 -*-
import numpy as np
import queue
    
def BFS(c,t,Num):
    q = queue.Queue()
    q.put(c)
    
    while not q.empty(): 
        n = q.get()
        if t[n[0] + 1][n[1]] != -1 and t[n[0] + 1][n[1]] == 9999:
            q.put([n[0] + 1, n[1]])
            t[n[0] + 1][n[1]] = Num
    
        if t[n[0]][n[1] + 1] != -1 and t[n[0]][n[1] + 1] == 9999:
            q.put([n[0], n[1] + 1])
            t[n[0]][n[1] + 1] = Num
        
        if t[n[0] - 1][n[1]] != -1 and t[n[0] - 1][n[1]] == 9999:
            q.put([n[0] - 1, n[1] ])
            t[n[0] - 1][ n[1] ] = Num

        if t[n[0]][n[1] - 1] != -1 and t[n[0]][n[1] - 1] == 9999:
            q.put([n[0],n[1] - 1])
            t[n[0]][n[1] - 1] = Num  


def SearchNum(t, Num):
    q = queue.Queue()
    
    for i in range(H + 4):
        for j in range(W + 4):
            if t[i][j] == Num:
                q.put([i,j])    
        
    return q

def Warp(c,t,Num):
    for i in range(c[0]-2,c[0]+3):
        for j in range(c[1]-2,c[1]+3):
            if t[i][j] == 9999:
                t[i][j] = Num
    
H, W = map(int,input().split())
C = list(map(int,input().split()))
D = list(map(int,input().split()))
S = []
for i in range(H):    
  S.append(list(input()))

C[0] -= 1
C[1] -= 1
D[0] -= 1
D[1] -= 1

T = np.full([H + 4,W + 4],-1)

for i in range(H):
    for j in range(W):
        if S[i][j] == '#':
            T[i+2][j+2] = -1
        if S[i][j] == '.':
            T[i+2][j+2] = 9999
                
T[C[0] + 2][C[1] + 2] = 0
BFS([C[0] + 2,C[1] + 2],T,0)

count = 0
while True:
    q_warp = SearchNum(T,count)
    count += 1
    if q_warp.empty():
        break
    
    while not q_warp.empty():
        n = q_warp.get()
        Warp([n[0],n[1]],T,count)
        
    q_BFS = SearchNum(T,count)
    while not q_BFS.empty():
        n2 = q_BFS.get()
        BFS(n,T,count)
        
    if count > 1000:
        break
    if T[D[0] + 2][D[1] + 2] != 9999:
        break
    

if T[D[0] + 2][D[1] + 2] != 9999:
    print(T[D[0] + 2][D[1] + 2])
else:
    print(-1)

Submission status: Wrong Answer

Solution code:
# -*- coding: utf-8 -*-
import numpy as np
import queue
    
def BFS(c,t,Num):
    q = queue.Queue()
    q.put(c)
    
    while not q.empty(): 
        n = q.get()
        if t[n[0] + 1][n[1]] != -1 and t[n[0] + 1][n[1]] == 9999:
            q.put([n[0] + 1, n[1]])
            t[n[0] + 1][n[1]] = Num
    
        if t[n[0]][n[1] + 1] != -1 and t[n[0]][n[1] + 1] == 9999:
            q.put([n[0], n[1] + 1])
            t[n[0]][n[1] + 1] = Num
        
        if t[n[0] - 1][n[1]] != -1 and t[n[0] - 1][n[1]] == 9999:
            q.put([n[0] - 1, n[1] ])
            t[n[0] - 1][ n[1] ] = Num

        if t[n[0]][n[1] - 1] != -1 and t[n[0]][n[1] - 1] == 9999:
            q.put([n[0],n[1] - 1])
            t[n[0]][n[1] - 1] = Num  


def SearchNum(t, Num):
    q = queue.Queue()
    
    for i in range(H + 4):
        for j in range(W + 4):
            if t[i][j] == Num:
                q.put([i,j])    
        
    return q

def Warp(c,t,Num):
    for i in range(c[0]-2,c[0]+3):
        for j in range(c[1]-2,c[1]+3):
            if t[i][j] == 9999:
                t[i][j] = Num
    
H, W = map(int,input().split())
C = list(map(int,input().split()))
D = list(map(int,input().split()))
S = []
for i in range(H):    
  S.append(list(input()))

C[0] -= 1
C[1] -= 1
D[0] -= 1
D[1] -= 1

T = np.full([H + 4,W + 4],-1)

for i in range(H):
    for j in range(W):
        if S[i][j] == '#':
            T[i+2][j+2] = -1
        if S[i][j] == '.':
            T[i+2][j+2] = 9999
                
T[C[0] + 2][C[1] + 2] = 0
BFS([C[0] + 2,C[1] + 2],T,0)
print(T)
count = 0
while True:
    q_warp = SearchNum(T,count)
    count += 1
    if q_warp.empty():
        break
    
    while not q_warp.empty():
        n = q_warp.get()
        Warp([n[0],n[1]],T,count)
        
    q_BFS = SearchNum(T,count)
    while not q_BFS.empty():
        n2 = q_BFS.get()
        BFS(n,T,count)
        
    if count > 1000:
        break
    if T[D[0] + 2][D[1] + 2] != 9999:
        break
    

if T[D[0] + 2][D[1] + 2] != 9999:
    print(T[D[0] + 2][D[1] + 2])
else:
    print(-1)            

print(T)

Submission status: Wrong Answer

Solution code:
import sys
from collections import deque

def input(): return sys.stdin.readline().strip()

icase=0
if icase==0:
    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
    s=[[] for i in range(h)]
    for i in range(h):
        s[i]=input()
        
ij=[(1,0),(-1,0),(0,1),(0,-1)]
wpij=[(1,1),(-1,-1),(-1,1),(1,-1),
      (2,-2),(2,-1),(2,0),(2,1),(2,2),
      (-2,-2),(-2,-1),(-2,0),(-2,1),(-2,2),
      (1,2),(0,2),(-1,2),(1,-2),(0,-2),(-1,-2)]

hh=[i for i in range(h)]
ww=[i for i in range(w)]

g=[[[] for i in range(w)] for i in range(h)]
gg=[[[] for i in range(w)] for i in range(h)]
#wpg2=[[0]*w for i in range(h)]
wpg2=[[[] for i in range(w)] for i in range(h)]
wpg=[]

for i in hh:
    for j in ww:
#        if i+1<h:
#            if s[i+1][j]==".":
#                g[i][j].append((i+1,j))        
#            else:
#                wpg2[i][j]=1
#        if 0<=i-1:
#            if s[i-1][j]==".":
#                g[i][j].append((i-1,j))        
#            else:
#                wpg2[i][j]=1
#        if j+1<w:
#            if s[i][j+1]==".":
#                g[i][j].append((i,j+1))        
#            else:
#                wpg2[i][j]=1
#        if 0<=j-1:
#            if s[i][j-1]==".":
#                g[i][j].append((i,j-1))        
#            else:
#                wpg2[i][j]=1

        g[i][j]=[(i+ii,j+jj) for ii,jj in ij if (0<=(i+ii)<h and 0<=(j+jj)<w and s[i+ii][j+jj]==".")]


for i in hh:
    for j in ww:
        wpg2[i][j]=[(i+ii,j+jj) for ii,jj in ij if (0<=(i+ii)<h and 0<=(j+jj)<w and s[i+ii][j+jj]=="#")]
#        if i+1<h and s[i+1][j]=="#": wpg2[i][j]=1
#        if 0<=i-1 and s[i-1][j]=="#": wpg2[i][j]=1
#        if j+1<w and s[i][j+1]=="#": wpg2[i][j]=1
#        if 0<=j-1 and s[i][j-1]=="#": wpg2[i][j]=1
                
#        if (i+1<h and s[i+1][j]=="#") or \
#           (0<=i-1 and s[i-1][j]=="#") or \
#           (j+1<w and s[i][j+1]=="#") or \
#           (0<=j-1 and s[i][j-1]=="#"): 
#            wpg2[i][j]=1


#g=[[[(i+ii,j+jj) for ii,jj in ij if (0<=(i+ii)<h and 0<=(j+jj)<w and s[i+ii][j+jj]==".")] for j in ww ] for i in hh]

print(-2)
#wpg2=[[[(i+ii,j+jj) for ii,jj in ij if (0<=(i+ii)<h and 0<=(j+jj)<w and s[i+ii][j+jj]=="#")] for j in ww ] for i in hh]


for i in hh:
    for j in ww:
        if len(wpg2[i][j])>=1:
            wpg.append((i,j))
                
for i,j in wpg:
    for ii,jj in wpij:
         if 0<=i+ii and i+ii<h and 0<=j+jj \
            and j+jj<w and s[i+ii][j+jj]==".":
                gg[i][j].append((i+ii,j+jj))        

q=deque([(ch,cw)])
qq=deque()
parent=[[-1]*w for i in range(h)]
parent[ch][cw]=0
dist=[[-1]*w for i in range(h)]
dist[ch][cw]=0
while True:
    while q:
#        print("q1:",q)
        hi,wi = q.popleft()
        if len(gg[hi][wi])>0:
            qq.append((hi,wi))
        for hj,wj in g[hi][wi]:
            if parent[hj][wj] !=-1:
                continue
            else:
                parent[hj][wj]=(hi,wi)
                dist[hj][wj]=dist[hi][wi]+1
                q.append((hj,wj))
                if hj==dh and wj==dw:
                    print(dist[dh][dw]//(10**7))   
                    sys.exit()

    while qq:
        hi,wi = qq.popleft()
        for hj,wj in gg[hi][wi]:
            if parent[hj][wj]!=-1:
                continue
            parent[hj][wj]=(hi,wi)
            dist[hj][wj]=dist[hi][wi]+10**7
            q.append((hj,wj))
            if hj==dh and wj==dw:
                print(dist[dh][dw]//(10**7))   
                sys.exit()

    if len(q)==0:
        break
print(-1)

Submission status: Wrong Answer

Solution code:
# -*- coding: utf-8 -*-
import numpy as np
import queue
    
def BFS(c,t,Num):
    q = queue.Queue()
    q.put(c)
    
    while not q.empty(): 
        n = q.get()
        if t[n[0] + 1][n[1]] != -1 and t[n[0] + 1][n[1]] == 999 :
            q.put([n[0] + 1, n[1]])
            t[n[0] + 1][n[1]] = Num
    
        if t[n[0]][n[1] + 1] != -1 and t[n[0]][n[1] + 1] == 9999:
            q.put([n[0], n[1] + 1])
            t[n[0]][n[1] + 1] = Num
        
        if t[n[0] - 1][n[1]] != -1 and t[n[0] - 1][n[1]] == 9999:
            q.put([n[0] - 1, n[1] ])
            t[n[0] - 1][ n[1] ] = Num

        if t[n[0]][n[1] - 1] != -1 and t[n[0]][n[1] - 1] == 9999:
            q.put([n[0],n[1] - 1])
            t[n[0]][n[1] - 1] = Num  


def SearchNum(t, Num):
    q = queue.Queue()
    
    for i in range(H + 4):
        for j in range(W + 4):
            if t[i][j] == Num:
                q.put([i,j])    
        
    return q

def Warp(c,t,Num):
    for i in range(c[0]-2,c[0]+3):
        for j in range(c[1]-2,c[1]+3):
            if t[i][j] == 9999:
                t[i][j] = Num
    
H, W = map(int,input().split())
C = list(map(int,input().split()))
D = list(map(int,input().split()))
S = []
for i in range(H):    
  S.append(list(input()))

C[0] -= 1
C[1] -= 1
D[0] -= 1
D[1] -= 1

T = np.full([H + 4,W + 4],-1)

for i in range(H):
    for j in range(W):
        if S[i][j] == '#':
            T[i+2][j+2] = -1
        if S[i][j] == '.':
            T[i+2][j+2] = 9999
                
T[C[0] + 2][C[1] + 2] = 0
BFS([C[0] + 2,C[1] + 2],T,0)
count = 0
while True:
    q_warp = SearchNum(T,count)
    count += 1
    if q_warp.empty():
        break
    
    while not q_warp.empty():
        n = q_warp.get()
        Warp([n[0],n[1]],T,count)
        
    q_BFS = SearchNum(T,count)
    while not q_BFS.empty():
        n = q_BFS.get()
        BFS(n,T,count)
        
    if count > 1000:
        break
    if T[D[0] + 2][D[1] + 2] != 9999:
        break
    

if T[D[0] + 2][D[1] + 2] != 9999:
    print(T[D[0] + 2][D[1] + 2])
else:
    print(-1)

Submission status: Wrong Answer

Solution code:
# -*- coding: utf-8 -*-
import numpy as np
import queue
    
def BFS(c,t,Num):
    q = queue.Queue()
    q.put(c)
    
    while not q.empty(): 
        n = q.get()
        if t[n[0] + 1][n[1]] != -1 and t[n[0] + 1][n[1]] == 999 :
            q.put([n[0] + 1, n[1]])
            t[n[0] + 1][n[1]] = Num
    
        if t[n[0]][n[1] + 1] != -1 and t[n[0]][n[1] + 1] == 9999:
            q.put([n[0], n[1] + 1])
            t[n[0]][n[1] + 1] = Num
        
        if t[n[0] - 1][n[1]] != -1 and t[n[0] - 1][n[1]] == 9999:
            q.put([n[0] - 1, n[1] ])
            t[n[0] - 1][ n[1] ] = Num

        if t[n[0]][n[1] - 1] != -1 and t[n[0]][n[1] - 1] == 9999:
            q.put([n[0],n[1] - 1])
            t[n[0]][n[1] - 1] = Num  


def SearchNum(t, Num):
    q = queue.Queue()
    
    for i in range(H + 4):
        for j in range(W + 4):
            if t[i][j] == Num:
                q.put([i,j])    
        
    return q

def Warp(c,t,Num):
    for i in range(c[0]-2,c[0]+3):
        for j in range(c[1]-2,c[1]+3):
            if t[i][j] == 9999:
                t[i][j] = Num
    
H, W = map(int,input().split())
C = list(map(int,input().split()))
D = list(map(int,input().split()))
S = []
for i in range(H):    
  S.append(list(input()))

C[0] -= 1
C[1] -= 1
D[0] -= 1
D[1] -= 1

T = np.full([H + 4,W + 4],-1)

for i in range(H):
    for j in range(W):
        if S[i][j] == '#':
            T[i+2][j+2] = -1
        if S[i][j] == '.':
            T[i+2][j+2] = 9999
                
T[C[0] + 2][C[1] + 2] = 0
BFS([C[0] + 2,C[1] + 2],T,0)
count = 0
while True:
    q_warp = SearchNum(T,count)
    count += 1
    if q_warp.empty():
        break
    while not q_warp.empty():
        n = q_warp.get()
        Warp([n[0],n[1]],T,count)
        
    q_BFS = SearchNum(T,count)
    while not q_BFS.empty():
        n = q_BFS.get()
        BFS(n,T,count)

    if T[D[0] + 2][D[1] + 2] != 9999:
        break
    

if T[D[0] + 2][D[1] + 2] != 9999:
    print(T[D[0] + 2][D[1] + 2])
else:
    print(-1)

Submission status: Wrong Answer

Solution code:
import sys
from collections import deque

def input(): return sys.stdin.readline().strip()

icase=0
if icase==0:
    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
    s=[[] for i in range(h)]
    for i in range(h):
        s[i]=input()
        
ij=[(1,0),(-1,0),(0,1),(0,-1)]
wpij=[(1,1),(-1,-1),(-1,1),(1,-1),
      (2,-2),(2,-1),(2,0),(2,1),(2,2),
      (-2,-2),(-2,-1),(-2,0),(-2,1),(-2,2),
      (1,2),(0,2),(-1,2),(1,-2),(0,-2),(-1,-2)]

hh=[i for i in range(h)]
ww=[i for i in range(w)]

g=[[[] for i in range(w)] for i in range(h)]
gg=[[[] for i in range(w)] for i in range(h)]
#wpg2=[[0]*w for i in range(h)]
wpg2=[[[] for i in range(w)] for i in range(h)]
wpg=[]

for i in hh:
    for j in ww:
#        if i+1<h:
#            if s[i+1][j]==".":
#                g[i][j].append((i+1,j))        
#            else:
#                wpg2[i][j]=1
#        if 0<=i-1:
#            if s[i-1][j]==".":
#                g[i][j].append((i-1,j))        
#            else:
#                wpg2[i][j]=1
#        if j+1<w:
#            if s[i][j+1]==".":
#                g[i][j].append((i,j+1))        
#            else:
#                wpg2[i][j]=1
#        if 0<=j-1:
#            if s[i][j-1]==".":
#                g[i][j].append((i,j-1))        
#            else:
#                wpg2[i][j]=1

        g[i][j]=[(i+ii,j+jj) for ii,jj in ij if (0<=(i+ii)<h and 0<=(j+jj)<w and s[i+ii][j+jj]==".")]
#        wpg2[i][j]=[(i+ii,j+jj) for ii,jj in ij if (0<=(i+ii)<h and 0<=(j+jj)<w and s[i+ii][j+jj]=="#")]
#        if i+1<h and s[i+1][j]=="#": wpg2[i][j]=1
#        if 0<=i-1 and s[i-1][j]=="#": wpg2[i][j]=1
#        if j+1<w and s[i][j+1]=="#": wpg2[i][j]=1
#        if 0<=j-1 and s[i][j-1]=="#": wpg2[i][j]=1
                
#        if (i+1<h and s[i+1][j]=="#") or \
#           (0<=i-1 and s[i-1][j]=="#") or \
#           (j+1<w and s[i][j+1]=="#") or \
#           (0<=j-1 and s[i][j-1]=="#"): 
#            wpg2[i][j]=1


#g=[[[(i+ii,j+jj) for ii,jj in ij if (0<=(i+ii)<h and 0<=(j+jj)<w and s[i+ii][j+jj]==".")] for j in ww ] for i in hh]

print(-2)
wpg2=[[[(i+ii,j+jj) for ii,jj in ij if (0<=(i+ii)<h and 0<=(j+jj)<w and s[i+ii][j+jj]=="#")] for j in ww ] for i in hh]


for i in hh:
    for j in ww:
        if len(wpg2[i][j])>=1:
            wpg.append((i,j))
                
for i,j in wpg:
    for ii,jj in wpij:
         if 0<=i+ii and i+ii<h and 0<=j+jj \
            and j+jj<w and s[i+ii][j+jj]==".":
                gg[i][j].append((i+ii,j+jj))        

q=deque([(ch,cw)])
qq=deque()
parent=[[-1]*w for i in range(h)]
parent[ch][cw]=0
dist=[[-1]*w for i in range(h)]
dist[ch][cw]=0
while True:
    while q:
#        print("q1:",q)
        hi,wi = q.popleft()
        if len(gg[hi][wi])>0:
            qq.append((hi,wi))
        for hj,wj in g[hi][wi]:
            if parent[hj][wj] !=-1:
                continue
            else:
                parent[hj][wj]=(hi,wi)
                dist[hj][wj]=dist[hi][wi]+1
                q.append((hj,wj))
                if hj==dh and wj==dw:
                    print(dist[dh][dw]//(10**7))   
                    sys.exit()

    while qq:
        hi,wi = qq.popleft()
        for hj,wj in gg[hi][wi]:
            if parent[hj][wj]!=-1:
                continue
            parent[hj][wj]=(hi,wi)
            dist[hj][wj]=dist[hi][wi]+10**7
            q.append((hj,wj))
            if hj==dh and wj==dw:
                print(dist[dh][dw]//(10**7))   
                sys.exit()

    if len(q)==0:
        break
print(-1)