Buggy python submission (verdict: Runtime Error):
import numpy as np
import sys
sys.setrecursionlimit(1000000)
input = sys.stdin.readline
h,w = map(int,input().split())
l=['#'*(w+2)]+['#'+input().strip()+'#' for i in range(h)]+['#'*(w+2)]
dp = np.zeros((h+2,w+2,2),dtype=int)
cnt = 0
ans = 0

def dfsw(x,y,cnt):
  if l[x][y+1] == '.':
    cnt += 1
    dp[x,y,0] = dfsw(x,y+1,cnt)
    return dp[x,y,0]
  else:
    dp[x,y,0] = cnt
    return dp[x,y,0]

def dfsh(x,y,cnt):
  if l[x+1][y] == '.':
    cnt += 1
    dp[x,y,1] = dfsh(x+1,y,cnt)
    return dp[x,y,1]
  else:
    dp[x,y,1] = cnt
    return dp[x,y,1]

for i in range(h+2):
  for j in range(w+2):
    if l[i][j] == '.':
      if dp[i,j,0] == 0:
        dfsw(i,j,1)
      if dp[i,j,1] == 0:
        dfsh(i,j,1)
      ans = max(ans, sum(dp[i,j]) - 1)
print(ans)

Fixed submission:
import numpy as np
h,w = map(int,input().split())
ar = np.array([list(input()) for _ in range(h)]) == '.'
#print(ar)
l = np.zeros((h,w),dtype=int)
r = np.zeros((h,w),dtype=int)
u = np.zeros((h,w),dtype=int)
d = np.zeros((h,w),dtype=int)

for i in range(h):
  u[i] = (u[i-1]+1)*ar[i]
  #print(u)
  d[-i-1] = (d[-i]+1)*ar[-i-1]
  #print(d)
  
for j in range(w):
  l[:,j] = (l[:,j-1]+1)*ar[:,j]
  #print(l)
  r[:,-j-1] = (r[:,-j]+1)*ar[:,-j-1]
  #print(r)
print(np.max(u+d+l+r)-3)

Buggy python submission (verdict: Time Limit Exceeded):
import numpy as np
import sys
sys.setrecursionlimit(1000000)
input = sys.stdin.readline
h,w = map(int,input().split())
l=['#'*(w+2)]+['#'+input().strip()+'#' for i in range(h)]+['#'*(w+2)]
dp = np.zeros((h+2,w+2,2),dtype=int)
cnt = 0
ans = 0

def dfsw(x,y,cnt):
  if l[x][y+1] == '.':
    cnt += 1
    dp[x,y,0] = dfsw(x,y+1,cnt)
    return dp[x,y,0]
  else:
    dp[x,y,0] = cnt
    return dp[x,y,0]

def dfsh(x,y,cnt):
  if l[x+1][y] == '.':
    cnt += 1
    dp[x,y,1] = dfsh(x+1,y,cnt)
    return dp[x,y,1]
  else:
    dp[x,y,1] = cnt
    return dp[x,y,1]

for i in range(h+2):
  for j in range(w+2):
    if l[i][j] == '.':
      if dp[i,j,0] == 0:
        dfsw(i,j,1)
      if dp[i,j,1] == 0:
        dfsh(i,j,1)
      ans = max(ans, sum(dp[i,j]) - 1)
print(ans)

Fixed submission:
import numpy as np
h,w = map(int,input().split())
ar = np.array([list(input()) for _ in range(h)]) == '.'
#print(ar)
l = np.zeros((h,w),dtype=int)
r = np.zeros((h,w),dtype=int)
u = np.zeros((h,w),dtype=int)
d = np.zeros((h,w),dtype=int)

for i in range(h):
  u[i] = (u[i-1]+1)*ar[i]
  #print(u)
  d[-i-1] = (d[-i]+1)*ar[-i-1]
  #print(d)
  
for j in range(w):
  l[:,j] = (l[:,j-1]+1)*ar[:,j]
  #print(l)
  r[:,-j-1] = (r[:,-j]+1)*ar[:,-j-1]
  #print(r)
print(np.max(u+d+l+r)-3)

Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(1000000)
input = sys.stdin.readline
h,w = map(int,input().split())
l=['#'*(w+2)]+['#'+input().strip()+'#' for i in range(h)]+['#'*(w+2)]
dp = [[[0]*2 for i in range(w+2)] for i in range(h+2)]
cnt = 0
ans = 0

def dfsw(x,y,cnt):
  if l[x][y+1] == '.':
    cnt += 1
    dp[x][y][0] = dfsw(x,y+1,cnt)
    return dp[x][y][0]
  else:
    dp[x][y][0] = cnt
    return dp[x][y][0]

def dfsh(x,y,cnt):
  if l[x+1][y] == '.':
    cnt += 1
    dp[x][y][1] = dfsh(x+1,y,cnt)
    return dp[x][y][1]
  else:
    dp[x][y][1] = cnt
    return dp[x][y][1]

for i in range(h+2):
  for j in range(w+2):
    if l[i][j] == '.':
      if dp[i][j][0] == 0:
        dfsw(i,j,1)
      if dp[i][j][1] == 0:
        dfsh(i,j,1)
      ans = max(ans, sum(dp[i][j]) - 1)
print(ans)

Fixed submission:
import numpy as np
h,w = map(int,input().split())
ar = np.array([list(input()) for _ in range(h)]) == '.'
#print(ar)
l = np.zeros((h,w),dtype=int)
r = np.zeros((h,w),dtype=int)
u = np.zeros((h,w),dtype=int)
d = np.zeros((h,w),dtype=int)

for i in range(h):
  u[i] = (u[i-1]+1)*ar[i]
  #print(u)
  d[-i-1] = (d[-i]+1)*ar[-i-1]
  #print(d)
  
for j in range(w):
  l[:,j] = (l[:,j-1]+1)*ar[:,j]
  #print(l)
  r[:,-j-1] = (r[:,-j]+1)*ar[:,-j-1]
  #print(r)
print(np.max(u+d+l+r)-3)

Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(1000000)
input = sys.stdin.readline
h,w = map(int,input().split())
l=['#'*(w+2)]+['#'+input().strip()+'#' for i in range(h)]+['#'*(w+2)]
dp = [[[0]*2 for i in range(w+2)] for i in range(h+2)]
cnt = 0
ans = 0

def dfsw(x,y,cnt):
  if l[x][y+1] == '.':
    cnt += 1
    dp[x][y][0] = dfsw(x,y+1,cnt)
    return dp[x][y][0]
  else:
    dp[x][y][0] = cnt
    return dp[x][y][0]

def dfsh(x,y,cnt):
  if l[x+1][y] == '.':
    cnt += 1
    dp[x][y][1] = dfsh(x+1,y,cnt)
    return dp[x][y][1]
  else:
    dp[x][y][1] = cnt
    return dp[x][y][1]

for i in range(h+2):
  for j in range(w+2):
    if l[i][j] == '.':
      if dp[i][j][0] == 0:
        dfsw(i,j,1)
      if dp[i][j][1] == 0:
        dfsh(i,j,1)
      ans = max(ans, sum(dp[i][j]) - 1)
print(ans)

Fixed submission:
import numpy as np
h,w = map(int,input().split())
ar = np.array([list(input()) for _ in range(h)]) == '.'
#print(ar)
l = np.zeros((h,w),dtype=int)
r = np.zeros((h,w),dtype=int)
u = np.zeros((h,w),dtype=int)
d = np.zeros((h,w),dtype=int)

for i in range(h):
  u[i] = (u[i-1]+1)*ar[i]
  #print(u)
  d[-i-1] = (d[-i]+1)*ar[-i-1]
  #print(d)
  
for j in range(w):
  l[:,j] = (l[:,j-1]+1)*ar[:,j]
  #print(l)
  r[:,-j-1] = (r[:,-j]+1)*ar[:,-j-1]
  #print(r)
print(np.max(u+d+l+r)-3)

Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(1000000)
input = sys.stdin.readline
h,w = map(int,input().split())
l=['#'*(w+2)]+['#'+input().strip()+'#' for i in range(h)]+['#'*(w+2)]
dp = [[[0]*2 for i in range(w+2)] for i in range(h+2)]
cnt = 0
ans = 0

def dfsw(x,y,cnt):
  if l[x][y+1] == '.':
    cnt += 1
    dp[x][y][0] = dfsw(x,y+1,cnt)
    return dp[x][y][0]
  else:
    dp[x][y][0] = cnt
    return dp[x][y][0]

def dfsh(x,y,cnt):
  if l[x+1][y] == '.':
    cnt += 1
    dp[x][y][1] = dfsh(x+1,y,cnt)
    return dp[x][y][1]
  else:
    dp[x][y][1] = cnt
    return dp[x][y][1]

for i in range(h+2):
  for j in range(w+2):
    if l[i][j] == '.' and dp[i][j][0] == 0:
      dfsw(i,j,1)
for i in range(h+2):
  for j in range(w+2):
    if l[i][j] == '.' and dp[i][j][1] == 0:
      dfsh(i,j,1)
    
for i in range(h+2):
  for j in range(w+2):
    if l[i][j] == '.':
      ans = max(ans, sum(dp[i][j]) - 1)
print(ans)

Fixed submission:
import numpy as np
h,w = map(int,input().split())
ar = np.array([list(input()) for _ in range(h)]) == '.'
#print(ar)
l = np.zeros((h,w),dtype=int)
r = np.zeros((h,w),dtype=int)
u = np.zeros((h,w),dtype=int)
d = np.zeros((h,w),dtype=int)

for i in range(h):
  u[i] = (u[i-1]+1)*ar[i]
  #print(u)
  d[-i-1] = (d[-i]+1)*ar[-i-1]
  #print(d)
  
for j in range(w):
  l[:,j] = (l[:,j-1]+1)*ar[:,j]
  #print(l)
  r[:,-j-1] = (r[:,-j]+1)*ar[:,-j-1]
  #print(r)
print(np.max(u+d+l+r)-3)

Buggy python submission (verdict: Runtime Error):
h,w = map(int,input().split())
l=['#'*(w+2)]+['#'+input()+'#' for i in range(h)]+['#'*(w+2)]
dp = [[[0]*2 for i in range(w+2)] for i in range(h+2)]
cnt = 0
ans = 0

def dfsw(x,y,cnt):
  if l[x][y+1] == '.':
    cnt += 1
    dp[x][y][0] = dfsw(x,y+1,cnt)
    return dp[x][y][0]
  else:
    dp[x][y][0] = cnt
    return dp[x][y][0]

def dfsh(x,y,cnt):
  if l[x+1][y] == '.':
    cnt += 1
    dp[x][y][1] = dfsh(x+1,y,cnt)
    return dp[x][y][1]
  else:
    dp[x][y][1] = cnt
    return dp[x][y][1]

for i in range(h+2):
  for j in range(w+2):
    if l[i][j] == '.' and dp[i][j][0] == 0:
      dfsw(i,j,1)
for i in range(h+2):
  for j in range(w+2):
    if l[i][j] == '.' and dp[i][j][1] == 0:
      dfsh(i,j,1)
    
for i in range(h+2):
  for j in range(w+2):
    if l[i][j] == '.':
      ans = max(ans, sum(dp[i][j]) - 1)
print(ans)

Fixed submission:
import numpy as np
h,w = map(int,input().split())
ar = np.array([list(input()) for _ in range(h)]) == '.'
#print(ar)
l = np.zeros((h,w),dtype=int)
r = np.zeros((h,w),dtype=int)
u = np.zeros((h,w),dtype=int)
d = np.zeros((h,w),dtype=int)

for i in range(h):
  u[i] = (u[i-1]+1)*ar[i]
  #print(u)
  d[-i-1] = (d[-i]+1)*ar[-i-1]
  #print(d)
  
for j in range(w):
  l[:,j] = (l[:,j-1]+1)*ar[:,j]
  #print(l)
  r[:,-j-1] = (r[:,-j]+1)*ar[:,-j-1]
  #print(r)
print(np.max(u+d+l+r)-3)

Buggy python submission (verdict: Time Limit Exceeded):
import sys
input = sys.stdin.readline
h,w = map(int,input().split())
l=['#'*(w+2)]+['#'+input().strip()+'#' for i in range(h)]+['#'*(w+2)]
dp = [[[0]*4 for i in range(w+2)] for i in range(h+2)]
ans = 0

for i in range(h+2):
  for j in range(w+2):
     if l[i][j] == '#':
      dp[i][j][0] = 0
     else:
      dp[i][j][0] = dp[i][j-1][0] + 1
for i in range(h+2):
  for j in range(w+1,0,-1):
     if l[i][j] == '#':
      dp[i][j][1] = 0
     else:
      dp[i][j][1] = dp[i][j+1][1] + 1
for i in range(h+2):
  for j in range(w+2):
     if l[i][j] == '#':
      dp[i][j][2] = 0
     else:
      dp[i][j][2] = dp[i-1][j][2] + 1
for i in range(h+1,0,-1):
  for j in range(w+2):
     if l[i][j] == '#':
      dp[i][j][3] = 0
     else:
      dp[i][j][3] = dp[i+1][j][3] + 1
for i in range(h+2):
  for j in range(w+2):
    if l[i][j] == '.':
      ans = max(ans, sum(dp[i][j]) - 3)
print(ans)

Fixed submission:
import numpy as np
h,w = map(int,input().split())
ar = np.array([list(input()) for _ in range(h)]) == '.'
#print(ar)
l = np.zeros((h,w),dtype=int)
r = np.zeros((h,w),dtype=int)
u = np.zeros((h,w),dtype=int)
d = np.zeros((h,w),dtype=int)

for i in range(h):
  u[i] = (u[i-1]+1)*ar[i]
  #print(u)
  d[-i-1] = (d[-i]+1)*ar[-i-1]
  #print(d)
  
for j in range(w):
  l[:,j] = (l[:,j-1]+1)*ar[:,j]
  #print(l)
  r[:,-j-1] = (r[:,-j]+1)*ar[:,-j-1]
  #print(r)
print(np.max(u+d+l+r)-3)

Buggy python submission (verdict: Time Limit Exceeded):
h,w = map(int,input().split())
l=['#'*(w+2)]+['#'+input()+'#' for i in range(h)]+['#'*(w+2)]
dp = [[[0]*4 for i in range(w+2)] for i in range(h+2)]
ans = 0

for i in range(h+2):
  for j in range(w+2):
     if l[i][j] == '#':
      dp[i][j][0] = 0
     else:
      dp[i][j][0] = dp[i][j-1][0] + 1
for i in range(h+2):
  for j in range(w+1,0,-1):
     if l[i][j] == '#':
      dp[i][j][1] = 0
     else:
      dp[i][j][1] = dp[i][j+1][1] + 1
for i in range(h+2):
  for j in range(w+2):
     if l[i][j] == '#':
      dp[i][j][2] = 0
     else:
      dp[i][j][2] = dp[i-1][j][2] + 1
for i in range(h+1,0,-1):
  for j in range(w+2):
     if l[i][j] == '#':
      dp[i][j][3] = 0
     else:
      dp[i][j][3] = dp[i+1][j][3] + 1
for i in range(h+2):
  for j in range(w+2):
    if l[i][j] == '.':
      ans = max(ans, sum(dp[i][j]) - 3)
print(ans)

Fixed submission:
import numpy as np
h,w = map(int,input().split())
ar = np.array([list(input()) for _ in range(h)]) == '.'
#print(ar)
l = np.zeros((h,w),dtype=int)
r = np.zeros((h,w),dtype=int)
u = np.zeros((h,w),dtype=int)
d = np.zeros((h,w),dtype=int)

for i in range(h):
  u[i] = (u[i-1]+1)*ar[i]
  #print(u)
  d[-i-1] = (d[-i]+1)*ar[-i-1]
  #print(d)
  
for j in range(w):
  l[:,j] = (l[:,j-1]+1)*ar[:,j]
  #print(l)
  r[:,-j-1] = (r[:,-j]+1)*ar[:,-j-1]
  #print(r)
print(np.max(u+d+l+r)-3)