Problem:


Score: 400 points

Problem statement

We have an H \times W grid whose squares are painted black or white. The square at the i-th row from the top and the j-th column from the left is denoted as (i, j).

Snuke would like to play the following game on this grid. At the beginning of the game, there is a character called Kenus at square (1, 1). The player repeatedly moves Kenus up, down, left or right by one square. The game is completed when Kenus reaches square (H, W) passing only white squares.

Before Snuke starts the game, he can change the color of some of the white squares to black. However, he cannot change the color of square (1, 1) and (H, W). Also, changes of color must all be carried out before the beginning of the game.

When the game is completed, Snuke's score will be the number of times he changed the color of a square before the beginning of the game. Find the maximum possible score that Snuke can achieve, or print -1 if the game cannot be completed, that is, Kenus can never reach square (H, W) regardless of how Snuke changes the color of the squares.  

The color of the squares are given to you as characters s_{i, j}. If square (i, j) is initially painted by white, s_{i, j} is .; if square (i, j) is initially painted by black, s_{i, j} is #.

Constraints

H is an integer between 2 and 50 (inclusive).

W is an integer between 2 and 50 (inclusive).

s_{i, j} is . or # (1 \leq i \leq H, 1 \leq j \leq W).

s_{1, 1} and s_{H, W} are ..

Input

Input is given from Standard Input in the following format:

H W
s_{1, 1}s_{1, 2}s_{1, 3} ... s_{1, W}
s_{2, 1}s_{2, 2}s_{2, 3} ... s_{2, W}
 :   :
s_{H, 1}s_{H, 2}s_{H, 3} ... s_{H, W}

Output

Print the maximum possible score that Snuke can achieve, or print -1 if the game cannot be completed.

Sample Input 1

3 3
..#
#..
...

Sample Output 1

2

The score 2 can be achieved by changing the color of squares as follows:

Sample Input 2

10 37
.....................................
...#...####...####..###...###...###..
..#.#..#...#.##....#...#.#...#.#...#.
..#.#..#...#.#.....#...#.#...#.#...#.
.#...#.#..##.#.....#...#.#.###.#.###.
.#####.####..#.....#...#..##....##...
.#...#.#...#.#.....#...#.#...#.#...#.
.#...#.#...#.##....#...#.#...#.#...#.
.#...#.####...####..###...###...###..
.....................................

Sample Output 2

209



Sample input:
3 3
..#
#..
...


Sample output:
2

Submission status: Runtime Error

Solution code:
h,w = map(int, input().split())
maze = [input() for i in range(h)]
route = [[0] * w for i in range(h)]
white = 0
for i in range(h):
    for j in range(w):
        if maze[i][j] == '.':
            white += 1
 
 
class MyStack:
    def __init__(self):
        self.stack = []
    def push(self, item_1, item_2):
        self.stack.append([item_1,item_2])
    def pop(self):
        result = self.stack.pop(0)
        return result[0],result[1]
 
 
def min_route():
    global h,w
    stack = MyStack()
    stack.push(1,1)
    route[0][0] = 0
    n = 0
    while n <= h*w:
        y,x = stack.pop()
        route_num = route[y-1][x-1] + 1
        if y != h:
            if maze[y][x-1] == '.' and route[y][x-1] == 0:
                stack.push(y+1,x)
                route[y][x-1] += route_num
        if y != 1:
            if maze[y-2][x-1] == '.' and route[y-2][x-1] == 0:
                stack.push(y-1,x)
                route[y-2][x-1] += route_num
        if x != w:
            if maze[y-1][x] == '.' and route[y-1][x] == 0:
                stack.push(y,x+1)
                route[y-1][x] += route_num
        if x != 1:
            if maze[y-1][x-2] == '.' and route[y-1][x-2] == 0:
                stack.push(y,x-1)
                route[y-1][x-2] += route_num
        if route[h-1][w-1]  != 0:
            return route[h-1][w-1]
        n += 1
    print(-1)
    exit()
 
ans = white - min_route() - 1
 
if ans < 0:
    print(-1)
else:
    print(ans)

Submission status: Runtime Error

Solution code:
h,w = map(int, input().split())
maze = [input() for i in range(h)]
route = [[0] * w for i in range(h)]
white = 0
for i in range(h):
    for j in range(w):
        if maze[i][j] == '.':
            white += 1
 
 
class MyStack:
    def __init__(self):
        self.stack = []
    def push(self, item_1, item_2):
        self.stack.append([item_1,item_2])
    def pop(self):
        result = self.stack.pop(0)
        return result[0],result[1]
 
 
def min_route():
    global h,w
    stack = MyStack()
    stack.push(1,1)
    route[0][0] = 0
    n = 0
    while n <= h*w:
        y,x = stack.pop()
        route_num = route[y-1][x-1] + 1
        if y != h:
            if maze[y][x-1] == '.' and route[y][x-1] == 0:
                stack.push(y+1,x)
                route[y][x-1] += route_num
        if y != 1:
            if maze[y-2][x-1] == '.' and route[y-2][x-1] == 0:
                stack.push(y-1,x)
                route[y-2][x-1] += route_num
        if x != w:
            if maze[y-1][x] == '.' and route[y-1][x] == 0:
                stack.push(y,x+1)
                route[y-1][x] += route_num
        if x != 1:
            if maze[y-1][x-2] == '.' and route[y-1][x-2] == 0:
                stack.push(y,x-1)
                route[y-1][x-2] += route_num
        if route[h-1][w-1]  != 0:
            return route[h-1][w-1]
        n += 1
    return
 
ans = white - min_route() - 1
 
if ans < 0:
    print(-1)
else:
    print(ans)

Submission status: Runtime Error

Solution code:
h,w = map(int, input().split())
maze = [input() for i in range(h)]
route = [[0] * w for i in range(h)]
white = 0
for i in range(h):
    for j in range(w):
        if maze[i][j] == '.':
            white += 1
 
 
class MyStack:
    def __init__(self):
        self.stack = []
    def push(self, item_1, item_2):
        self.stack.append([item_1,item_2])
    def pop(self):
        result = self.stack.pop(0)
        return result[0],result[1]
 
 
def min_route():
    global h,w
    stack = MyStack()
    stack.push(1,1)
    route[0][0] = 0
    
    n = 0
 
    while n <= h*w:
        y,x = stack.pop()
        route_num = route[y-1][x-1] + 1
        if y != h:
            if maze[y][x-1] == '.' and route[y][x-1] == 0:
                stack.push(y+1,x)
                route[y][x-1] += route_num
        if y != 1:
            if maze[y-2][x-1] == '.' and route[y-2][x-1] == 0:
                stack.push(y-1,x)
                route[y-2][x-1] += route_num
        if x != w:
            if maze[y-1][x] == '.' and route[y-1][x] == 0:
                stack.push(y,x+1)
                route[y-1][x] += route_num
        if x != 1:
            if maze[y-1][x-2] == '.' and route[y-1][x-2] == 0:
                stack.push(y,x-1)
                route[y-1][x-2] += route_num
        if route[h-1][w-1]  != 0:
            return route[h-1][w-1]
        n += 1
 
ans = white - min_route() - 1
 
if ans < 0:
    print(-1)
else:
    print(ans)

Submission status: Runtime Error

Solution code:
h,w = map(int, input().split())
maze = [input() for i in range(h)]
route = [[0] * w for i in range(h)]
white = 0
for i in range(h):
    for j in range(w):
        if maze[i][j] == '.':
            white += 1
 
 
class MyStack:
    def __init__(self):
        self.stack = []
    def push(self, item_1, item_2):
        self.stack.append([item_1,item_2])
    def pop(self):
        result = self.stack.pop(0)
        return result[0],result[1]
 
 
def min_route():
    global h,w
    stack = MyStack()
    stack.push(1,1)
    route[0][0] = 0
 
    while n <= h*w:
        y,x = stack.pop()
        route_num = route[y-1][x-1] + 1
        if y != h:
            if maze[y][x-1] == '.' and route[y][x-1] == 0:
                stack.push(y+1,x)
                route[y][x-1] += route_num
        if y != 1:
            if maze[y-2][x-1] == '.' and route[y-2][x-1] == 0:
                stack.push(y-1,x)
                route[y-2][x-1] += route_num
        if x != w:
            if maze[y-1][x] == '.' and route[y-1][x] == 0:
                stack.push(y,x+1)
                route[y-1][x] += route_num
        if x != 1:
            if maze[y-1][x-2] == '.' and route[y-1][x-2] == 0:
                stack.push(y,x-1)
                route[y-1][x-2] += route_num
        if route[h-1][w-1]  != 0:
            return route[h-1][w-1]
 
ans = white - min_route() - 1
 
if ans < 0:
    print(-1)
else:
    print(ans)

Submission status: Runtime Error

Solution code:
import sys
sys.setrecursionlimit(1000000)

h,w = map(int, input().split())
maze = [input() for i in range(h)]
route = [[0] * w for i in range(h)]
white = 0
for i in range(h):
    for j in range(w):
        if maze[i][j] == '.':
            white += 1
 
 
class MyStack:
    def __init__(self):
        self.stack = []
    def push(self, item_1, item_2):
        self.stack.append([item_1,item_2])
    def pop(self):
        result = self.stack.pop(0)
        return result[0],result[1]
 
 
def min_route():
    global h,w
    stack = MyStack()
    stack.push(1,1)
    route[0][0] = 0
 
    while True:
        y,x = stack.pop()
        route_num = route[y-1][x-1] + 1
        if y != h:
            if maze[y][x-1] == '.' and route[y][x-1] == 0:
                stack.push(y+1,x)
                route[y][x-1] += route_num
        if y != 1:
            if maze[y-2][x-1] == '.' and route[y-2][x-1] == 0:
                stack.push(y-1,x)
                route[y-2][x-1] += route_num
        if x != w:
            if maze[y-1][x] == '.' and route[y-1][x] == 0:
                stack.push(y,x+1)
                route[y-1][x] += route_num
        if x != 1:
            if maze[y-1][x-2] == '.' and route[y-1][x-2] == 0:
                stack.push(y,x-1)
                route[y-1][x-2] += route_num
        if route[h-1][w-1]  != 0:
            return route[h-1][w-1]
 
ans = white - min_route() - 1
 
if ans < 0:
    print(-1)
else:
    print(ans)

Submission status: Runtime Error

Solution code:
h,w = map(int, input().split())
maze = [input() for i in range(h)]
route = [[0] * w for i in range(h)]
white = 0
for i in range(h):
    for j in range(w):
        if maze[i][j] == '.':
            white += 1

 
class MyStack:
    def __init__(self):
        self.stack = []
    def push(self, item_1, item_2):
        self.stack.append([item_1,item_2])
    def pop(self):
        result = self.stack.pop(0)
        return result[0],result[1]
 

def min_route():
    global h,w
    stack = MyStack()
    stack.push(1,1)
    route[0][0] = 0

    while True:
        y,x = stack.pop()
        route_num = route[y-1][x-1] + 1
        if y != h:
            if maze[y][x-1] == '.' and route[y][x-1] == 0:
                stack.push(y+1,x)
                route[y][x-1] += route_num
        if y != 1:
            if maze[y-2][x-1] == '.' and route[y-2][x-1] == 0:
                stack.push(y-1,x)
                route[y-2][x-1] += route_num
        if x != w:
            if maze[y-1][x] == '.' and route[y-1][x] == 0:
                stack.push(y,x+1)
                route[y-1][x] += route_num
        if x != 1:
            if maze[y-1][x-2] == '.' and route[y-1][x-2] == 0:
                stack.push(y,x-1)
                route[y-1][x-2] += route_num
        if route[h-1][w-1]  != 0:
            return route[h-1][w-1]

ans = white - min_route() - 1

if ans < 0:
    print(-1)
else:
    print(ans)

Submission status: Runtime Error

Solution code:
from collections import deque

dis_x = [1, 0, -1, 0]
dis_y = [0, 1, 0, -1]

goal_h, goal_w = map(int, input().split())

s = []
for _ in range(goal_h):
    line = input()
    s.append(list("#{}#".format(line)))

s = [list("#" * (goal_w + 2))] + s + [list("#" * (goal_w + 2))]

dist = [ [0] * (goal_w + 2) for _ in range(goal_w+2)]

que = deque([(1, 1)])

while que:
    h, w = que.popleft()

    for i in range(4):
        dx, dy = dis_x[i], dis_y[i]
        if s[h+dy][w+dx] == '.' and  dist[h+dy][w+dx] == 0:
            dist[h+dy][w+dx] = dist[h][w]+1
            que.append((h+dy, w+dx))

opt = dist[goal_h][goal_w]

not_wall_count = sum(l.count('.') for l in s)

if dist[goal_h][goal_w] == 0:
    print(-1)
else:
    print(not_wall_count - opt - 1)

Submission status: Runtime Error

Solution code:
from collections import deque

dis_x = [1, 0, -1, 0]
dis_y = [0, 1, 0, -1]

goal_h, goal_w = map(int, input().split())

s = []
for _ in range(goal_h):
    line = input()
    s.append(list("#{}#".format(line)))

s = [list("#" * (goal_w + 2))] + s + [list("#" * (goal_w + 2))]

dist = [ [0] * (goal_w + 2) for _ in range(goal_w+2)]

que = deque([(1, 1)])

while que:
    h, w = que.popleft()

    for i in range(4):
        dx, dy = dis_x[i], dis_y[i]
        if s[h+dy][w+dx] == '.' and  dist[h+dy][w+dx] == 0:
            dist[h+dy][w+dx] = dist[h][w]+1
            que.append((h+dy, w+dx))

opt = dist[goal_h][goal_w]

not_wall_count = 0
for i in range(1, goal_h+1):
    for j in range(1, goal_w+1):
        if s[i][j] == '.':
            not_wall_count += 1

if dist[goal_h][goal_w] == 0:
    print(-1)
else:
    print(not_wall_count - opt - 1)

Submission status: Runtime Error

Solution code:
from collections import deque

dis_x = [1, 0, -1, 0]
dis_y = [0, 1, 0, -1]

goal_h, goal_w = map(int, input().split())

s = []
for _ in range(goal_h):
    line = input()
    s.append(list("#{}#".format(line)))

s = [list("#" * (goal_w + 2))] + s + [list("#" * (goal_w + 2))]

dist = [ [0] * (goal_w + 2) for _ in range(goal_w+2)]

que = deque([(1, 1)])

while que:
    h, w = que.popleft()

    for i in range(4):
        dx, dy = dis_x[i], dis_y[i]
        if s[h+dy][w+dx] == '.' and  dist[h+dy][w+dx] == 0:
            dist[h+dy][w+dx] = dist[h][w]+1
            que.append((h+dy, w+dx))

opt = dist[goal_h][goal_w]

not_wall_count = 0
for i in range(1, goal_h+1):
    for j in range(1, goal_w+1):
        if s[i][j] == '.':
            not_wall_count += 1

if s[goal_h][goal_w] == '#':
    print(-1)
else:
    print(not_wall_count - opt - 1)

Submission status: Runtime Error

Solution code:
from collections import deque

dis_x = [1, 0, -1, 0]
dis_y = [0, 1, 0, -1]

goal_h, goal_w = map(int, input().split())

s = []
for _ in range(goal_h):
    line = input()
    s.append(list("#{}#".format(line)))

s = [list("#" * (goal_w + 2))] + s + [list("#" * (goal_w + 2))]

dist = [ [0] * (goal_w + 2) for _ in range(goal_w+2)]

que = deque([(1, 1)])

while que:
    h, w = que.popleft()

    for i in range(4):
        dx, dy = dis_x[i], dis_y[i]
        if s[h+dy][w+dx] == '.' and  dist[h+dy][w+dx] == 0:
            dist[h+dy][w+dx] = dist[h][w]+1
            que.append((h+dy, w+dx))

opt = dist[goal_h][goal_w]

not_wall_count = 0
for i in range(1, goal_h+1):
    for j in range(1, goal_w+1):
        if s[i][j] == '.':
            not_wall_count += 1

if opt == -1:
    print(-1)
else:
    print(not_wall_count - opt - 1)

Submission status: Runtime Error

Solution code:
from collections import deque

dis_x = [1, 0, -1, 0]
dis_y = [0, 1, 0, -1]

goal_h, goal_w = map(int, input().split())

s = []
for _ in range(goal_h):
    line = input()
    s.append(list("#{}#".format(line)))

s = [list("#" * (goal_w + 2))] + s + [list("#" * (goal_w + 2))]

dist = [ [0] * (goal_w + 2) for _ in range(goal_w+2)]

que = deque([(1, 1)])

while que:
    h, w = que.popleft()

    for i in range(4):
        dx, dy = dis_x[i], dis_y[i]
        if s[h+dy][w+dx] == '.' and  dist[h+dy][w+dx] == 0:
            dist[h+dy][w+dx] = dist[h][w]+1
            que.append((h+dy, w+dx))

opt = dist[goal_h][goal_w]

not_wall_count = 0
for i in range(1, goal_h+1):
    for j in range(1, goal_w+1):
        if s[i][j] == '.':
            not_wall_count += 1

print(not_wall_count - opt - 1)

Submission status: Runtime Error

Solution code:
from collections import deque

dis_x = [1, 0, -1, 0]
dis_y = [0, 1, 0, -1]

goal_h, goal_w = map(int, input().split())

s = []
for _ in range(goal_h):
    line = input()
    s.append(list("#{}#".format(line)))

s = [list("#" * (goal_w + 2))] + s + [list("#" * (goal_w + 2))]
s[1][1] = 's'

dist = [ [0] * (goal_w + 2) for _ in range(goal_w+2)]

que = deque([(1, 1)])

while que:
    h, w = que.popleft()

    for i in range(4):
        dx, dy = dis_x[i], dis_y[i]
        if s[h+dy][w+dx] == '.' and  dist[h+dy][w+dx] == 0:
            dist[h+dy][w+dx] = dist[h][w]+1
            que.append((h+dy, w+dx))

opt = dist[goal_h][goal_w]

not_wall_count = 0
for i in range(1, goal_h+1):
    for j in range(1, goal_w+1):
        if s[i][j] == '.':
            not_wall_count += 1

print(not_wall_count - opt)

Submission status: Runtime Error

Solution code:
from collections import deque

H,W=map(int,input().split())
H-=1
W-=1
maze=[]
for i in range(H+1):
   S=input()
   S=[c for c in S]
   maze.append(S)

maze[0][0]="S"

count=0
for i in range(H+1):
   for j in range(W+1):
      if maze[i][j]=="#":
         count+=1

que=deque([[0,0]])
steps=[[-1]*(W+1) for i in range(H+1)]
steps[0][0]=0
flag=True

def bfs():
      global flag
      now=que.popleft()
      now_step=steps[now[0]][now[1]]
      for dx,dy in (0,-1),(1,0),(0,1),(-1,0):
            ny=now[0]+dy
            nx=now[1]+dx
            if 0<=ny<=H and 0<=nx<=W:
                  if ny==H and nx==W:
                        print((H+1)*(W+1)-(now_step+1+1)-(count))
                        flag=False
                        break
                  elif maze[ny][nx]==".":
                        maze[ny][nx]="A"
                        que.append([ny,nx])
                        steps[ny][nx]=now_step+1
                  else:
                        pass

while(flag):
      bfs()

Submission status: Runtime Error

Solution code:
from collections import deque

H,W=map(int,input().split())
H-=1
W-=1
maze=[]
for i in range(H+1):
   S=input()
   S=[c for c in S]
   maze.append(S)

maze[0][0]="S"

count=0
for i in range(H+1):
   for j in range(W+1):
      if maze[i][j]=="#":
         count+=1

que=deque([[0,0]])
steps=[[-1]*(W+1) for i in range(H+1)]
steps[0][0]=0
flag=True

def bfs():
      global flag
      print(que)
      now=que.popleft()
      now_step=steps[now[0]][now[1]]
      for dx,dy in (0,-1),(1,0),(0,1),(-1,0):
            ny=now[0]+dy
            nx=now[1]+dx
            if 0<=ny<=H and 0<=nx<=W:
                  if ny==H and nx==W:
                        print((H+1)*(W+1)-(now_step+1+1)-(count))
                        flag=False
                        break
                  elif maze[ny][nx]==".":
                        maze[ny][nx]="A"
                        que.append([ny,nx])
                        steps[ny][nx]=now_step+1
                  else:
                        pass

while(flag):
      bfs()

Submission status: Runtime Error

Solution code:

from collections import deque

w,h = map(int,input().split())
maze = []

cnt_wall = 0
for _ in range(h):
    s = input()
    cnt_wall += s.count('#')
    maze.append(s)

inf = 10**5
def  bfs(d):
    visited = [[inf]*w for _ in range(h)]
    sx,sy = 0,0
    gx,gy = w-1, h-1
    que = deque([(sx,sy)])
    visited[sx][sy] = 1
    
    while que:
        x,y = que.popleft()
        if x==gx and y==gy:
            return visited[x][y]
        for i,j in ((1,0),(0,1),(-1,0),(0,-1)):
            nx,ny = x+i, y+j
            if 0<=nx<=gx and 0<=ny<=gy:
                if d[nx][ny]=='.' and visited[nx][ny]==inf:
                    visited[nx][ny] = visited[x][y]+1
                    que.append((nx,ny))
    else:
        return inf

min_step = bfs(maze)
if min_step == inf:
    print(-1)
else:
    print(h*w - min_step - cnt_wall)

Submission status: Runtime Error

Solution code:

from collections import deque

h,w = map(int,input().split())
maze = []

cnt_wall = 0
for _ in range(h):
    s = input()
    cnt_wall += s.count('#')
    maze.append(s)

inf = 10**5
def  bfs(d):
    visited = [[inf]*w for _ in range(h)]
    sx,sy = 0,0
    gx,gy = w-1, h-1
    que = deque([(sx,sy)])
    visited[sx][sy] = 1
    
    while que:
        x,y = que.popleft()
        if x==gx and y==gy:
            return visited[gx][gy]
        for i,j in ((1,0),(0,1),(-1,0),(0,-1)):
            nx,ny = x+i, y+j
            if 0<=nx<=gx and 0<=ny<=gy:
                if d[nx][ny]=='.' and visited[nx][ny]==inf:
                    visited[nx][ny] = visited[x][y]+1
                    que.append((nx,ny))
    else:
        return inf

min_step = bfs(maze)
if min_step == inf:
    print(-1)
else:
    print(h*w - min_step - cnt_wall)

Submission status: Runtime Error

Solution code:

from collections import deque

h,w = map(int,input().split())
maze = []

cnt_wall = 0
for _ in range(h):
    s = input()
    cnt_wall += s.count('#')
    maze.append(s)

def  bfs(d):
    inf = 10**5
    visited = [[inf]*w for _ in range(h)]
    sx,sy = 0,0
    gx,gy = w-1, h-1
    que = deque([(sx,sy)])
    visited[sx][sy] = 1
    
    while que:
        x,y = que.popleft()
        if x==gx and y==gy:
            return visited[gx][gy]
        for i,j in ((1,0),(0,1),(-1,0),(0,-1)):
            nx,ny = x+i, y+j
            if 0<=nx<=gx and 0<=ny<=gy:
                if d[nx][ny]=='.' and visited[nx][ny] == inf:
                    visited[nx][ny] = visited[x][y]+1
                    que.append((nx,ny))



min_step = bfs(maze)
if min_step == 10**5:
    print(-1)
else:
    print(h*w - min_step - cnt_wall)

Submission status: Runtime Error

Solution code:

from collections import deque

h,w = map(int,input().split())
maze = []

cnt_wall = 0
for _ in range(h):
    s = input()
    cnt_wall += s.count('#')
    maze.append(s)


def bfs(d):
    que = deque([(0,0,1)])
    visited = [[False]*w for _ in range(h)]
    table = [[-1]*w for _ in range(h)]
    while que:
        x,y,cnt = que.popleft()
        visited[x][y] = True
        table[x][y] = cnt
        for i,j in ((1,0),(0,1),(-1,0),(0,-1)):
            nx,ny = x+i,y+j
            if 0<=nx<w and 0<=ny<h:
                if (visited[nx][ny] == False):
                    if (d[nx][ny]=='.'):
                        que.append((nx, ny,cnt+1))
    return table[h-1][w-1]


min_step = bfs(maze)
if min_step < 0:
    print(-1)
else:
    print(h*w - min_step - cnt_wall)

Submission status: Runtime Error

Solution code:
import sys
from collections import deque
 
 
def bfs(H, W, maze, visited, sharp):
    queue = deque([[0, 0]])
    visited[0][0] = 0
    while queue:
        y, x = queue.popleft()
        if[y, x] == [H-1, W-1]:
            return ((H*W-sharp)-(visited[y][x]+1))
        for j, k in ([1, 0], [-1, 0], [0, 1], [0, -1]):
            new_y, new_x = y+j, x+k
            if  new_y != -1 and new_y != H and  \
                new_x != -1 and new_x != W and  \
                maze[new_y][new_x] == "." and   \
                visited[new_y][new_x] == -1:
                visited[new_y][new_x] = visited[y][x] + 1
                queue.append([new_y, new_x])
 
    return -1
 
 
def main():
    sharp = 0
 
    H, W = map(int,input().split())
    maze = [input() for i in range(H)]
    visited = [[-1]*W for j in range(H)]
 
    for k in range(H):

Submission status: Runtime Error

Solution code:
from collections import deque
import itertools

def bfs(graph, sh, sw):
    td = deque([[sh, sw]])
    graph[sh][sw] = "0"
    while td:
        h, w = td.popleft()
        num = int(graph[h][w])
        for j, k in ([1, 0], [-1, 0], [0, 1], [0, -1]):
            new_h, new_w = h + j, w + k
            if new_h == gy and new_w == gx:
                return num + 1
            
            if new_h < 0 or new_h >= H or new_w < 0 or new_w >= W:
                continue
            elif graph[new_h][new_w] == ".":
                graph[new_h][new_w] = str(num + 1)
                td.append([new_h, new_w])

H, W = map(int, input().split())
ls = [[_ for _ in input()] for _ in range(H)]

sy, sx = 0, 0
gy, gx = H - 1, W - 1

bcnt = 0

for s, t in itertools.product(range(H), range(W)):
    if ls[s][t] == "#":
        bcnt += 1

nurazu = bfs(ls, sy, sx)
nurazu = nurazu + 1

print(H * W - (bcnt + nurazu))

Submission status: Runtime Error

Solution code:
from collections import deque
H,W=map(int,input().split())
white=0
s=[]
for y in range(H):
   line=input()
    white+=line.count('.')
    s.append(list(line))
     
q = deque([(0,0,1)])
q_append=q.append
q_popleft=q.popleft
while q:
    x,y,l=q_popleft()
    if s[y][x]!='.':
        continue
    if x==W-1 and y==H-1:
        print(white-l)
        break
    s[y][x]='*'
    for d in [(1,0),(0,1),(-1,0),(0,-1)]:
        nx, ny=(x+d[0],y+d[1])
        if 0<=nx<W and 0<=ny<H:
            q_append((nx,ny,l+1))
else:
    print(-1)

Submission status: Runtime Error

Solution code:
    from collections import deque
    H,W=map(int,input().split())
    white=0
    s=[]
    for y in range(H):
        line=input()
        white+=line.count('.')
        s.append(list(line))
     
    q = deque([(0,0,1)])
    q_append=q.append
    q_popleft=q.popleft
    while q:
        x,y,l=q_popleft()
        if s[y][x]!='.':
            continue
        if x==W-1 and y==H-1:
            print(white-l)
            break
        for d in [(1,0),(0,1),(-1,0),(0,-1)]:
            nx, ny=(x+d[0],y+d[1])
            if 0<=nx<W and 0<=ny<H:
                q_append((nx,ny,l+1))
    else:
        print(-1)

Submission status: Runtime Error

Solution code:
H, W = map(int, input().split())

s = ['#' * (W + 2)] + ['#' + input() + '#' for i in range(H)] + ['#' * (W + 2)]

# m : そこにたどり着くために必要な白マスの数
m = [[-1 for x in range(W+2)] for y in range(H+2)]
m[1][1] = 1


from collections import deque
qx = deque([1])
qy = deque([1])

dx = [1, 0, -1, 0]
dy = [0, 1, 0, -1]


while len(qx) > 0:
    x, y = qx.popleft(), qy.popleft()
    for d in range(4):
        nx, ny = x + dx[d], y + dy[d]

        # 訪れたことがあるなら調べない
        if m[nx][ny] != -1: continue

        if s[ny][nx] == '.':
            qx.append(nx), qy.append(ny)
            m[ny][nx] = m[y][x] + 1

if m[H][W] == -1:
    print(-1)

else:
    print(sum([c.count('.') for c in s]) - m[H][W])

Submission status: Runtime Error

Solution code:
import sys
input = sys.stdin.readline
H,W=map(int,input().split())
s=[]
s.append("".join("#" for _ in range(W+2)))
cnt=0
for i in range(H):
    ss=input().strip()
    s.append("#"+ss+"#")
    for w in range(W):
        if ss[w]==".":
            cnt+=1

s.append("".join("#" for _ in range(W+2)))
#print(s)

def solv(h,w,cnt):
    #print(h,w)
    #print(a)
    #print(s)
    if a[h][w]>cnt+1 and s[h][w]==".":
        a[h][w]=cnt+1
        solv(h-1,w,cnt+1)
        solv(h,w-1,cnt+1)
        solv(h+1,w,cnt+1)
        solv(h,w+1,cnt+1)
    return 

a=[[1000000]*(W+2) for _ in range(H+2)]
solv(1,1,0)
print(cnt-a[-2][-2] if a[-2][-2]!= 1000000 else -1)

Submission status: Runtime Error

Solution code:
import sys
input = sys.stdin.readline
H,W=map(int,input().split())
s=[]
s.append("".join("#" for _ in range(W+2)))
cnt=0
for i in range(H):
    ss=input().strip()
    s.append("#"+ss+"#")
    for w in range(W):
        if ss[w]==".":
            cnt+=1

s.append("".join("#" for _ in range(W+2)))
#print(s)

def solv(h,w,cnt):
    #print(h,w)
    #print(a)
    #print(s)
    if a[h][w]>cnt+1 and s[h][w]==".":
        a[h][w]=cnt+1
        solv(h-1,w,cnt+1)
        solv(h,w-1,cnt+1)
        solv(h+1,w,cnt+1)
        solv(h,w+1,cnt+1)

a=[[1000000]*(W+2) for _ in range(H+2)]
solv(1,1,0)
print(cnt-a[-2][-2] if a[-2][-2]!= 1000000 else -1)

Submission status: Runtime Error

Solution code:
import sys
input = sys.stdin.readline
H,W=map(int,input().split())
s=[]
s.append("".join("#" for _ in range(W+2)))
cnt=0
for i in range(H):
    ss=input().strip()
    s.append("#"+ss+"#")
    for w in range(W):
        if ss[w]==".":
            cnt+=1

s.append("".join("#" for _ in range(W+2)))
#print(s)

def solv(h,w,cnt):
    #print(h,w)
    #print(a)
    #print(s)
    if a[h][w]>cnt+1 and s[h][w]==".":
        a[h][w]=cnt+1
        solv(h-1,w,cnt+1)
        solv(h,w-1,cnt+1)
        solv(h+1,w,cnt+1)
        solv(h,w+1,cnt+1)

a=[[1000000]*(W+2) for _ in range(H+2)]
solv(1,1,0)
print(cnt-a[-2][-2])

Submission status: Runtime Error

Solution code:
#D - Grid Repainting
#最短距離のルートを記録してあとはすべて黒く塗る
import copy
import sys
from collections import deque]
#幅優先のロジックを作成する
H,W = (int(i) for i in input().split())
s_tmp = []
for _ in range(H):
    s_tmp.append(list(input()))
d = [[1, 0], [-1, 0], [0, 1], [0, -1]]
q = deque()
q_old = deque()
s = copy.deepcopy(s_tmp)
q.append([0,0,0])
s[H-1][W-1] = 'g'
s[0][0] = 's'
flg = False
while len(q) > 0:
    #print(q)
    node = q.popleft()#qから左端を取り出す(幅優先)
    if node is not None:
        y = node[0]
        x = node[1]
        z = node[2]
        s[y][x] = '#'
        #上下を探索して移動できるところをスタックする
        for dx, dy in d:
            nx, ny = x + dx, y + dy
            if not (0 <= nx < W and 0 <= ny < H) or s[ny][nx] == '#':
                continue
            else:
                tmp = [ny,nx,z+1]
                if s[ny][nx] != 'y':
                    q.append(tmp)
                if s[ny][nx] == 'g' and flg == False:
                    #print(z+1)
                    flg = True
                    sys.exit()
                s[ny][nx] = 'y'
cnt = 0
for j in range(W):
    for i in range(H):
        if s_tmp[i][j] =='.':
            cnt += 1
if flg == False:
    print(-1)
else :
    print(cnt-z-2)

Submission status: Runtime Error

Solution code:
#D - Grid Repainting
#最短距離のルートを記録してあとはすべて黒く塗る
import copy
import sys
from collections import deque]
#幅優先のロジックを作成する
H,W = (int(i) for i in input().split())
s_tmp = []
for _ in range(H):
    s_tmp.append(list(input()))
d = [[1, 0], [-1, 0], [0, 1], [0, -1]]
q = deque()
q_old = deque()
s = copy.deepcopy(s_tmp)
q.append([0,0,0])
s[H-1][W-1] = 'g'
s[0][0] = 's'
flg = False
while len(q) > 0:
    #print(q)
    node = q.popleft()#qから左端を取り出す(幅優先)
    if node is not None:
        y = node[0]
        x = node[1]
        z = node[2]
        s[y][x] = '#'
        #上下を探索して移動できるところをスタックする
        for dx, dy in d:
            nx, ny = x + dx, y + dy
            if not (0 <= nx < W and 0 <= ny < H) or s[ny][nx] == '#':
                continue
            else:
                tmp = [ny,nx,z+1]
                if s[ny][nx] != 'y':
                    q.append(tmp)
                if s[ny][nx] == 'g' and flg == False:
                    print(z+1)
                    flg = True
                    sys.exit()
                s[ny][nx] = 'y'
cnt = 0
for j in range(W):
    for i in range(H):
        if s_tmp[i][j] =='.':
            cnt += 1
if flg == False:
    print(-1)
else :
    print(cnt-z-2)

Submission status: Runtime Error

Solution code:
from collections import deque
def bfs(field,visited,sy,sx,gy,gx):
    queue = deque([[sy,sx]])
    visited[sy][sx] = 0
    while queue:
        y,x = queue.popleft()
        if [y,x] == [gy,gx]:
            return visited[y][x]

        for j,k in ([1,0],[-1,0],[0,1],[0,-1]):
            new_y, new_x = y+j, x+k
            if new_y < 0 or new_y > gy or new_x < 0 or new_x > gx:
              continue
            if field[new_y][new_x] == "." and visited[new_y][new_x] == -1:
                visited[new_y][new_x] = visited[y][x] + 1
                queue.append([new_y, new_x])

if __name__ == "__main__":

    h,w=map(int,input().split())
    sy=1
    sx=1
    field=[list(input()) for i in range(h)]
    visited = [[-1]*w for i in range(h)]
    sy, sx, gy, gx = sy-1, sx-1, h-1, w-1
    ans = bfs(field,visited,sy,sx,gy,gx)
    cnt=0
    for i in range(h):
      for j in range(w):
        if field[i][j]==".":
          cnt+=1
    if ans==None:
      print(-1)
    else:
      print(cnt - bfs(field,visited,sy,sx,gy,gx) -1)