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:
import sys

input = sys.stdin.readline

H, W = map(int, input().split())
Ch, Cw = map(int, input().split())
Dh, Dw = map(int, input().split())
S = [input() for _ in range(H)]
Ch -= 1
Cw -= 1
Dh -= 1
Dw -= 1

a = [(-1, 0), (1, 0), (0, -1), (0, 1)]
b = [(i % 5 - 2, i // 5 - 2) for i in range(25) if (i % 5 - 2, i // 5 - 2) not in a]

d = [[-1] * W for _ in range(H)]
d[Ch][Cw] = 0
Q = {(Ch, Cw)}
P = {(Ch, Cw)}
while Q:
    while Q:
        h, w = Q.pop()
        for ah, aw in a:
            nh, nw = h + ah, w + aw
            if 0 <= nh < H and 0 <= nw < W and S[nh][nw] == ".":
                if d[nh][nw] == -1 or d[nh][nw] > d[h][w]:
                    d[nh][nw] = d[h][w]
                    Q.add((nh, nw))
                    P.add((nh, nw))
    pass

    # if d[Dh][Dw] != -1:
    #     break

    while P:
        h, w = P.pop()
        for ah, aw in b:
            nh, nw = h + ah, w + aw
            if 0 <= nh < H and 0 <= nw < W and S[nh][nw] == ".":
                if d[nh][nw] == -1 or d[nh][nw] > d[h][w] + 1:
                    d[nh][nw] = d[h][w] + 1
                    Q.add((nh, nw))

print(d[Dh][Dw])

Submission status: Wrong Answer

Solution code:
from collections import deque
infty = 10 ** 12

def BFS(dist):
    start = (C_H-1)*W + C_W-1
    queue = deque()
    queue.append((start, 0))
    searched = [0 for k in range(len(dist))] #探索された回数
    determined = [False for k in range(len(dist))] #最短距離が決まったか否か
    searched[start] += 1
    while queue:
        v = queue.popleft()
        if not determined[v[0]]:
            determined[v[0]] = True
            dist[v[0]] = v[1]
            row = v[0]//W
            col = v[0]%W
            for k in range(5):
                for l in range(5):
                    if (k, l) == (2, 2):
                        continue
                    else:
                        if S_extended[row + k][col + l] == "." and not determined[(row+k-2)*W + col+l-2] and searched[(row+k-2)*W + col+l-2] < 2:
                            searched[(row+k-2)*W + col+l-2] += 1
                            if (k, l) in [(1, 2), (2, 1), (2, 3), (3, 2)]:
                                queue.appendleft(((row+k-2)*W + col+l-2, v[1]))
                            else:
                                queue.append(((row+k-2)*W + col+l-2, v[1]+1))

H, W = map(int, input().split())
C_H, C_W = map(int, input().split())
D_H, D_W = map(int, input().split())

graph = [[] for i in range(H*W)]
S = []
for i in range(H):
    S.append(input())

s = ""
for j in range (W+4):
    s += "#"
S_extended = [s, s]
for i in range(H):
    S_extended.append("##" + S[i] + "##")
S_extended.append(s)
S_extended.append(s)

dist = [infty for i in range(H*W)]
BFS(dist)
if dist[(D_H-1)*W + D_W-1] == infty:
    print("-1")
else:
    print(dist[(D_H-1)*W + D_W-1])

Submission status: Wrong Answer

Solution code:
import sys

input = sys.stdin.readline

H, W = map(int, input().split())
Ch, Cw = map(int, input().split())
Dh, Dw = map(int, input().split())
S = [input() for _ in range(H)]
Ch -= 1
Cw -= 1
Dh -= 1
Dw -= 1

a = [(-1, 0), (1, 0), (0, -1), (0, 1)]
b = [(i % 5 - 2, i // 5 - 2) for i in range(25) if (i % 5 - 2, i // 5 - 2) not in a]

d = [[-1] * W for _ in range(H)]
d[Ch][Cw] = 0
Q = {(Ch, Cw)}
P = {(Ch, Cw)}
while Q:
    while Q:
        h, w = Q.pop()
        for ah, aw in a:
            nh, nw = h + ah, w + aw
            if 0 <= nh < H and 0 <= nw < W and S[nh][nw] == ".":
                if d[nh][nw] == -1 or d[nh][nw] > d[h][w] + 1:
                    d[nh][nw] = d[h][w]
                    Q.add((nh, nw))
                    P.add((nh, nw))
    pass

    if d[Dh][Dw] != -1:
        break

    while P:
        h, w = P.pop()
        for ah, aw in b:
            nh, nw = h + ah, w + aw
            if 0 <= nh < H and 0 <= nw < W and S[nh][nw] == ".":
                if d[nh][nw] == -1 or d[nh][nw] > d[h][w] + 1:
                    d[nh][nw] = d[h][w] + 1
                    Q.add((nh, nw))

print(d[Dh][Dw])

Submission status: Wrong Answer

Solution code:
import sys

input = sys.stdin.readline

H, W = map(int, input().split())
Ch, Cw = map(int, input().split())
Dh, Dw = map(int, input().split())
S = [input() for _ in range(H)]
Ch -= 1
Cw -= 1
Dh -= 1
Dw -= 1

a = [(-1, 0), (1, 0), (0, -1), (0, 1)]
b = [(i % 5 - 2, i // 5 - 2) for i in range(25) if (i % 5 - 2, i // 5 - 2) not in a]

d = [[-1] * W for _ in range(H)]
d[Ch][Cw] = 0
Q = {(Ch, Cw)}
P = {(Ch, Cw)}
while Q:
    while Q:
        h, w = Q.pop()
        for ah, aw in a:
            nh, nw = h + ah, w + aw
            if 0 <= nh < H and 0 <= nw < W and S[nh][nw] == ".":
                if d[nh][nw] == -1:
                    d[nh][nw] = d[h][w]
                    Q.add((nh, nw))
                    P.add((nh, nw))
    pass

    if d[Dh][Dw] != -1:
        break

    while P:
        h, w = P.pop()
        for ah, aw in b:
            nh, nw = h + ah, w + aw
            if 0 <= nh < H and 0 <= nw < W and S[nh][nw] == ".":
                if d[nh][nw] == -1:
                    d[nh][nw] = d[h][w] + 1
                    Q.add((nh, nw))

print(d[Dh][Dw])

Submission status: Wrong Answer

Solution code:
import sys

input = sys.stdin.readline

H, W = map(int, input().split())
Ch, Cw = map(int, input().split())
Dh, Dw = map(int, input().split())
S = [input() for _ in range(H)]
Ch -= 1
Cw -= 1
Dh -= 1
Dw -= 1

a = [(-1, 0), (1, 0), (0, -1), (0, 1)]
b = [(i % 5 - 2, i // 5 - 2) for i in range(25) if (i % 5 - 2, i // 5 - 2) not in a]

d = [[-1] * W for _ in range(H)]
d[Ch][Cw] = 0
Q = [(Ch, Cw)]
P = [(Ch, Cw)]
while Q:
    while Q:
        h, w = Q.pop()
        for ah, aw in a:
            nh, nw = h + ah, w + aw
            if 0 <= nh < H and 0 <= nw < W and S[nh][nw] == ".":
                if d[nh][nw] == -1:
                    d[nh][nw] = d[h][w]
                    Q.append((nh, nw))
                    P.append((nh, nw))
    pass

    if d[Dh][Dw] != -1:
        break

    while P:
        h, w = P.pop()
        for ah, aw in b:
            nh, nw = h + ah, w + aw
            if 0 <= nh < H and 0 <= nw < W and S[nh][nw] == ".":
                if d[nh][nw] == -1:
                    d[nh][nw] = d[h][w] + 1
                    Q.append((nh, nw))

print(d[Dh][Dw])

Submission status: Wrong Answer

Solution code:
# 正解ではない

from queue import PriorityQueue


def main():
    H, W = map(int, input().split())
    Ch, Cw = map(int, input().split())
    Dh, Dw = map(int, input().split())
    S = [list(input()) for i in range(H)]
    q = PriorityQueue()
    q.put((0, (Ch - 1, Cw - 1)))

    answer = resolve(q, S, (Dh - 1, Dw - 1), H, W)
    print(answer)


def resolve(q, S, D, H, W):
    cell_list = list()
    while not q.empty():
        worp_count, (x, y) = q.get()
        if S[x][y] == '/':
            continue
        S[x][y] = '/'
        cell_list.append((x, y))

        if (x, y) == D:
            return worp_count

        for i, j in [(x - 1, y), (x + 1, y), (x, y - 1), (x, y + 1)]:
            if 0 <= i < H and 0 <= j < W and S[i][j] == '.':
                q.put((worp_count, (i, j)))

    if not cell_list:
        return -1

    for x, y in cell_list:
        for i, j in [(i, j) for a in range(-2, 3) for b in range(-2, 3)]:
            if 0 <= x + i < H and 0 <= y + j < W and S[x + i][y + j] == '.':
                q.put((worp_count + 1, (x + i, y + j)))

    return resolve(q, S, D, H, W)


if __name__ == "__main__":
    main()

Submission status: Wrong Answer

Solution code:
# 正解ではない

from queue import PriorityQueue


def main():
    H, W = map(int, input().split())
    Ch, Cw = map(int, input().split())
    Dh, Dw = map(int, input().split())
    S = [list(input()) for i in range(H)]
    q = PriorityQueue()
    q.put((0, (Ch - 1, Cw - 1)))

    answer = resolve(q, S, (Dh - 1, Dw - 1), H, W)
    print(answer)


def resolve(q, S, D, H, W):
    is_empty = True
    while not q.empty():
        worp_count, (x, y) = q.get()
        if S[x][y] == '/':
            continue
        S[x][y] = '/'
        is_empty = False

        if (x, y) == D:
            return worp_count

        if 0 <= x - 1 < H and S[x - 1][y] == '.':
            q.put((worp_count, (x - 1, y)))
        elif 0 <= x + 1 < H and S[x + 1][y] == '.':
            q.put((worp_count, (x + 1, y)))
        elif 0 <= y - 1 < W and S[x][y - 1] == '.':
            q.put((worp_count, (x, y - 1)))
        elif 0 <= y + 1 < W and S[x][y + 1] == '.':
            q.put((worp_count, (x, y + 1)))

        for i, j in [(a, b) for a in range(-2, 3) for b in range(-2, 3)]:
            if 0 <= x + i < H and 0 <= y + j < W and S[x + i][y + j] == '.':
                q.put((worp_count + 1, (x + i, y + j)))

    if is_empty:
        return -1

    return resolve(q, S, D, H, W)


if __name__ == "__main__":
    main()

Submission status: Wrong Answer

Solution code:
import sys
from collections import deque
import itertools

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=[]


#hhww=[]
#for i in hh:
#    for j in ww:
#        if s[i][j]==".":
#            hhww.append((i,j))
hhww=[(i,j) for i,j in itertools.product(hh,ww) if s[i][j]=="."]
                
for i,j in hhww:
    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]==".")] 
print(-2)
#for i in hh:
#    for j in ww:
#        if s[i][j]==".":
#            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]==".")] 

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


for i in hh:
    for j in ww:
        if 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:
# 正解ではない

from queue import PriorityQueue


def main():
    H, W = map(int, input().split())
    Ch, Cw = map(int, input().split())
    Dh, Dw = map(int, input().split())
    S = [list(input()) for i in range(H)]
    q = PriorityQueue()
    q.put((0, (Ch - 1, Cw - 1)))

    answer = resolve(q, S, (Dh - 1, Dw - 1), H, W)
    print(answer)


def resolve(q, S, D, H, W):
    is_empty = True
    while not q.empty():
        worp_count, (x, y) = q.get()
        if S[x][y] != '.':
            continue
        S[x][y] = '/'
        is_empty = False

        if (x, y) == D:
            return worp_count

        if 0 <= x - 1 < H and S[x - 1][y] == '.':
            q.put((worp_count, (x - 1, y)))
        elif 0 <= x + 1 < H and S[x + 1][y] == '.':
            q.put((worp_count, (x + 1, y)))
        elif 0 <= y - 1 < W and S[x][y - 1] == '.':
            q.put((worp_count, (x, y - 1)))
        elif 0 <= y + 1 < W and S[x][y + 1] == '.':
            q.put((worp_count, (x, y + 1)))

    if is_empty:
        return -1

    for i in range(-2, 3):
        for j in range(-2, 3):
            if 0 <= x + i < H and 0 <= y + j < W and S[x + i][y + j] == '.':
                q.put((worp_count + 1, (x + i, y + j)))

    return resolve(q, S, D, H, W)


if __name__ == "__main__":
    main()

Submission status: Wrong Answer

Solution code:
# 正解ではない

from queue import PriorityQueue


def main():
    H, W = map(int, input().split())
    Ch, Cw = map(int, input().split())
    Dh, Dw = map(int, input().split())
    S = [list(input()) for i in range(H)]
    q = PriorityQueue()
    q.put((0, (Ch - 1, Cw - 1)))

    answer = resolve(q, S, (Dh - 1, Dw - 1), H, W)
    print(answer)


def resolve(q, S, D, H, W):
    is_empty = True
    while not q.empty():
        is_empty = False
        worp_count, (x, y) = q.get()
        S[x][y] = '/'

        if (x, y) == D:
            return worp_count

        if 0 <= x - 1 < H and S[x - 1][y] == '.':
            q.put((worp_count, (x - 1, y)))
        elif 0 <= x + 1 < H and S[x + 1][y] == '.':
            q.put((worp_count, (x + 1, y)))
        elif 0 <= y - 1 < W and S[x][y - 1] == '.':
            q.put((worp_count, (x, y - 1)))
        elif 0 <= y + 1 < W and S[x][y + 1] == '.':
            q.put((worp_count, (x, y + 1)))

    if is_empty:
        return -1

    for i in range(-2, 3):
        for j in range(-2, 3):
            if 0 <= x + i < H and 0 <= y + j < W and S[x + i][y + j] == '.':
                q.put((worp_count + 1, (x + i, y + j)))

    return resolve(q, S, D, H, W)


if __name__ == "__main__":
    main()

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=[]

hhww=[]
for i in hh:
    for j in ww:
        if s[i][j]==".":
            hhww.append((i,j))
            
for i,j in hhww:
    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]==".")] 

print(-2)
#for i in hh:
#    for j in ww:
#        if s[i][j]==".":
#            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]==".")] 

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


for i in hh:
    for j in ww:
        if 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:
from sys import stdin

H, W = map(int, input().split())
Ch, Cw = map(int, input().split())
Dh, Dw = map(int, input().split())
S = ""
for h in range(H):
    S += stdin.readline().rstrip('\n')
    
G = [{} for i in range(H*W)]
INF = 10**18
dx = [-1, 0, 1, 0]
dy = [0, -1, 0, 1]
for h in range(H):
    for w in range(W):
        now = h * W + w
        if now != "#":
            for v in range(4):
                ni = h+dx[v]
                nj = w+dy[v]
                if ni < 0 or ni >= H or nj < 0 or nj >=W: continue
                t = ni*W + nj
                if S[t] == "#":
                    G[now][t] = INF
                else:
                    G[now][t] = 0
        
            # Warp
            for ei in range(-2, 3):
                for ej in range(-2, 3):
                    ni = h+ei
                    nj = w+ej
                    if ni < 0 or ni >= H or nj < 0 or nj >=W: continue
                    t_ = ni*W + nj
                    if t_ != now and t_ not in G[now].keys() and S[t_] == ".":
                        G[now][t_] = 1

Submission status: Wrong Answer

Solution code:
H, W = map(int, input().split())
ch, cw = map(lambda x: int(x)-1, input().split())
dh, dw = map(lambda x: int(x)-1, input().split())
s = [input() for _ in range(H)]

E = [[[] for _ in range(W)] for _ in range(H)]
for h in range(H):
    for w in range(W):
        for i, j in [(0,1), (0,-1), (1,0), (-1,0)]:
            if (h+i<0 or w+j<0) or (h+i>=H or w+j>=W):
                continue
            if s[h+i][w+j] == '#':
                continue
            E[h][w].append((0, (h+i, w+j)))

        for i in range(-2, 3):
            for j in range(-2, 3):
                if i == 0 and j == 0:
                    continue
                if (h+i<0 or w+j<0) or (h+i>=H or w+j>=W):
                    continue
                if s[h+i][w+j] == '#':
                    continue
                E[h][w].append((1, (h+i, w+j)))


def dijkstra(h, w):
    import heapq
    hq = [(0, h, w)]
    heapq.heapify(hq)
    cost = [[float('inf')] * W for _ in range(H)]
    cost[h][w] = 0

    while hq:
        c, vh, vw = heapq.heappop(hq)
        if c > cost[vh][vw]:
            continue
        for d, (uh, uw) in E[vh][vw]:
            tmp = d + cost[vh][vw]
            if tmp >= cost[uh][uw]:
                continue
            cost[uh][uw] = tmp
            heapq.heappush(hq, (cost[uh][uw], uh, uw))
    return cost


dist = dijkstra(ch, cw)
ans = dist[dh][dw]
print(ans)

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 s[i][j]==".":
            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]==".")] 

print(-2)
#for i in hh:
#    for j in ww:
#        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]=="#")]
for i in hh:
    for j in ww:
        if i+1<h and s[i+1][j]=="#": wpg2[i][j]=1
        elif 0<=i-1 and s[i-1][j]=="#": wpg2[i][j]=1
        elif j+1<w and s[i][j+1]=="#": wpg2[i][j]=1
        elif 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]


#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 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:
from sys import stdin

H, W = map(int, input().split())
Ch, Cw = map(int, input().split())
Dh, Dw = map(int, input().split())
S = ""
for h in range(H):
    S += stdin.readline().rstrip('\n')
    
G = [{} for i in range(H*W)]
INF = 10**18
for h in range(H):
    for w in range(W):
        now = h * W + w
        if now != "#":
            # left
            t = now - 1
            if  h * W <= t:
                if S[t] == "#":
                    G[now][t] = INF
                else:
                    G[now][t] = 0
            # right
            t = now + 1
            if  h * W <= t < (h+1) * W:
                if S[t] == "#":
                    G[now][t] = INF
                else:
                    G[now][t] = 0
            # up
            t = now - W
            if 0 <= t < H*W:
                if S[t] == "#":
                    G[now][t] = INF
                else:
                    G[now][t] = 0
            # down
            t = now + W
            if 0 <= t < H*W:
                if S[t] == "#":
                    G[now][t] = INF
                else:
                    G[now][t] = 0
        
            # Warp
            a = [(h+hh)*W + w + i for hh in range(-2, 3) for i in range(-2, 3) ]

Submission status: Wrong Answer

Solution code:
from sys import stdin

H, W = map(int, input().split())
Ch, Cw = map(int, input().split())
Dh, Dw = map(int, input().split())
S = ""
for h in range(H):
    S += stdin.readline().rstrip('\n')
    
G = [{} for i in range(H*W)]
INF = 10**18
for h in range(H):
    for w in range(W):
        now = h * W + w
        if now != "#":
            # left
            t = now - 1
            if  h * W <= t:
                if S[t] == "#":
                    G[now][t] = INF
                else:
                    G[now][t] = 0
            # right
            t = now + 1
            if  h * W <= t < (h+1) * W:
                if S[t] == "#":
                    G[now][t] = INF
                else:
                    G[now][t] = 0
            # up
            t = now - W
            if 0 <= t < H*W:
                if S[t] == "#":
                    G[now][t] = INF
                else:
                    G[now][t] = 0
            # down
            t = now + W
            if 0 <= t < H*W:
                if S[t] == "#":
                    G[now][t] = INF
                else:
                    G[now][t] = 0
        
            # Warp
            for hh in range(-2, 3):
                t = (h+hh)*W + w
                #print(now)
                for i in range(-2, 3):
                    t_ = t + i
                    if t_ != now and t_ not in G[now].keys() and 0<= t_ < H*W  and ((h+hh) * W <= t_ <(h+hh+1) * W):
                        if S[t_] == ".":
                            G[now][t_] = 1

Submission status: Wrong Answer

Solution code:
from sys import stdin

H, W = map(int, input().split())
Ch, Cw = map(int, input().split())
Dh, Dw = map(int, input().split())
S = ""
for h in range(H):
    S += stdin.readline().rstrip('\n')
    
G = [{} for i in range(H*W)]
INF = 10**18
for h in range(H):
    for w in range(W):
        now = h * W + w
        if now != "#":
            # left
            t = now - 1
            if  h * W <= t:
                if S[t] == "#":
                    G[now][t] = INF
                else:
                    G[now][t] = 0
            # right
            t = now + 1
            if  h * W <= t < (h+1) * W:
                if S[t] == "#":
                    G[now][t] = INF
                else:
                    G[now][t] = 0
            # up
            t = now - W
            if 0 <= t < H*W:
                if S[t] == "#":
                    G[now][t] = INF
                else:
                    G[now][t] = 0
            # down
            t = now + W
            if 0 <= t < H*W:
                if S[t] == "#":
                    G[now][t] = INF
                else:
                    G[now][t] = 0
        
            # Warp
            for hh in range(-2, 3):
                t = (h+hh)*W + w
                #print(now)
                for i in range(-2, 3):
                    t_ = t + i
                    if 0<= t_ < H*W  and ((h+hh) * W <= t_ <(h+hh+1) * W):
                        if t_ != now and t_ not in G[now].keys() and S[t_] == ".":
                            G[now][t_] = 1

Submission status: Wrong Answer

Solution code:
H, W = map(int, input().split())
Ch, Cw = map(int, input().split())
Dh, Dw = map(int, input().split())
S = ""
for h in range(H):
    S += input()
    
G = [{} for i in range(H*W)]
INF = 10**18
for h in range(H):
    for w in range(W):
        now = h * W + w
        if now != "#":
            # left
            t = now - 1
            if  h * W <= t:
                if S[t] == "#":
                    G[now][t] = INF
                else:
                    G[now][t] = 0
            # right
            t = now + 1
            if  h * W <= t < (h+1) * W:
                if S[t] == "#":
                    G[now][t] = INF
                else:
                    G[now][t] = 0
            # up
            t = now - W
            if 0 <= t < H*W:
                if S[t] == "#":
                    G[now][t] = INF
                else:
                    G[now][t] = 0
            # down
            t = now + W
            if 0 <= t < H*W:
                if S[t] == "#":
                    G[now][t] = INF
                else:
                    G[now][t] = 0
        
            # Warp
            for hh in range(-2, 3):
                t = (h+hh)*W + w
                #print(now)
                for i in range(-2, 3):
                    t_ = t + i
                    G[now][t_] = 1