Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(10**6)
h,w=map(int,input().split())
s=[list(input())for i in range(h)]
a=[[float("inf")]*w for i in range(h)]
b=[[False]*w for i in range(h)]
c=[[False]*w for i in range(h)]
def f(x,y,t,p):
    if 0<=x<h and 0<=y<w:
        if p[x][y]==False:
            if s[x][y]=="#":
                if b[x][y]==False:
                    a[x][y]=0
                    b[x][y]=True
                    k=[[False]*w for i in range(h)]
                    f(x,y+1,1,k)
                    f(x+1,y,1,k)
                    f(x-1,y,1,k)
                    f(x,y-1,1,k)
            else:
                if a[x][y]>t and t<h+w:
                    a[x][y]=t
                    c[x][y]=True
                    f(x,y+1,t+1,p)
                    f(x+1,y,t+1,p)
                    f(x-1,y,t+1,p)
                    f(x,y-1,t+1,p)
for i in range(h):
    for j in range(w):
        if s[i][j]=="#":
            f(i,j,0,c)
            break
print(max(max(i)for i in a))

Fixed submission:
import numpy as np
from scipy.ndimage import distance_transform_cdt as d
h,w=map(int,input().split())
s=[[1 if i=="." else 0 for i in input()]for i in range(h)]
a=d(s,metric='taxicab')
print(a.max())

Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(10**6)
h,w=map(int,input().split())
s=[list(input())for i in range(h)]
a=[[float("inf")]*w for i in range(h)]
b=[[False]*w for i in range(h)]
def f(x,y,t):
    if 0<=x<h and 0<=y<w:
        if s[x][y]=="#":
            if b[x][y]==False:
                a[x][y]=0
                b[x][y]=True
                f(x,y+1,1)
                f(x+1,y,1)
                f(x-1,y,1)
                f(x,y-1,1)
        else:
            if a[x][y]>t and t<h+w:
                a[x][y]=t
                f(x,y+1,t+1)
                f(x+1,y,t+1)
                f(x-1,y,t+1)
                f(x,y-1,t+1)
for i in range(h):
    for j in range(w):
        if s[i][j]=="#":
            f(i,j,0)
            break
print(max(max(i)for i in a))

Fixed submission:
import numpy as np
from scipy.ndimage import distance_transform_cdt as d
h,w=map(int,input().split())
s=[[1 if i=="." else 0 for i in input()]for i in range(h)]
a=d(s,metric='taxicab')
print(a.max())

Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(10**6)
from itertools import chain
import numpy as np
h,w=map(int,input().split())
s=[list(input())for i in range(h)]
a=[[float("inf")]*w for i in range(h)]
b=[[False]*w for i in range(h)]
d=set()
def f(x,y,t):
    if 0<=x<h and 0<=y<w:
        if s[x][y]=="#":
            if b[x][y]==False:
                a[x][y]=0
                b[x][y]=True
                f(x,y+1,1)
                f(x+1,y,1)
                f(x-1,y,1)
                f(x,y-1,1)
        else:
            if a[x][y]>t:
                a[x][y]=t
                f(x,y+1,t+1)
                f(x+1,y,t+1)
                f(x-1,y,t+1)
                f(x,y-1,t+1)
i,j=divmod(list(chain(*s)).index("#"), len(s[0]))
f(i,j,0)
print(np.array(a).max())

Fixed submission:
import numpy as np
from scipy.ndimage import distance_transform_cdt as d
h,w=map(int,input().split())
s=[[1 if i=="." else 0 for i in input()]for i in range(h)]
a=d(s,metric='taxicab')
print(a.max())

Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(10**6)
from itertools import chain
import numpy as np
h,w=map(int,input().split())
s=[list(input())for i in range(h)]
a=[[float("inf")]*w for i in range(h)]
b=[[False]*w for i in range(h)]
d=set()
def f(x,y,t):
    if 0<=x<h and 0<=y<w:
        if s[x][y]=="#":
            if b[x][y]==False:
                a[x][y]=0
                b[x][y]=True
                f(x,y+1,1)
                f(x+1,y,1)
                f(x-1,y,1)
                f(x,y-1,1)
        else:
            if a[x][y]>t:
                a[x][y]=t
                f(x,y+1,t+1)
                f(x+1,y,t+1)
                f(x-1,y,t+1)
                f(x,y-1,t+1)
i,j=divmod(list(chain(*s)).index("#"), len(s[0]))
f(i,j,0)
print(max(max(i)for i in a))

Fixed submission:
import numpy as np
from scipy.ndimage import distance_transform_cdt as d
h,w=map(int,input().split())
s=[[1 if i=="." else 0 for i in input()]for i in range(h)]
a=d(s,metric='taxicab')
print(a.max())

Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(10**6)
h,w=map(int,input().split())
s=[list(input())for i in range(h)]
a=[[float("inf")]*w for i in range(h)]
b=[[False]*w for i in range(h)]
def f(x,y,t):
    if 0<=x<h and 0<=y<w:
        if s[x][y]=="#":
            if b[x][y]==False:
                a[x][y]=0
                b[x][y]=True
                f(x,y+1,1)
                f(x+1,y,1)
                f(x-1,y,1)
                f(x,y-1,1)
        else:
            if a[x][y]>t:
                a[x][y]=t
                f(x,y+1,t+1)
                f(x+1,y,t+1)
                f(x-1,y,t+1)
                f(x,y-1,t+1)
for i in range(h):
    for j in range(w):
        if s[i][j]=="#":
            f(i,j,0)
            break
print(max(max(i)for i in a))

Fixed submission:
import numpy as np
from scipy.ndimage import distance_transform_cdt as d
h,w=map(int,input().split())
s=[[1 if i=="." else 0 for i in input()]for i in range(h)]
a=d(s,metric='taxicab')
print(a.max())

Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(10**7)
h,w=map(int,input().split())
s=[list(input())for i in range(h)]
a=[[float("inf")]*w for i in range(h)]
b=[[False]*w for i in range(h)]
def f(x,y,t):
    if 0<=x<h and 0<=y<w:
        if s[x][y]=="#":
            if b[x][y]==False:
                a[x][y]=0
                b[x][y]=True
                f(x,y+1,1)
                f(x+1,y,1)
                f(x-1,y,1)
                f(x,y-1,1)
        else:
            if a[x][y]>t:
                a[x][y]=t
                f(x,y+1,t+1)
                f(x+1,y,t+1)
                f(x-1,y,t+1)
                f(x,y-1,t+1)
for i in range(h):
    for j in range(w):
        if s[i][j]=="#":
            f(i,j,0)
            break
print(max(max(i)for i in a))

Fixed submission:
import numpy as np
from scipy.ndimage import distance_transform_cdt as d
h,w=map(int,input().split())
s=[[1 if i=="." else 0 for i in input()]for i in range(h)]
a=d(s,metric='taxicab')
print(a.max())

Buggy python submission (verdict: Runtime Error):
h,w=map(int,input().split())
s=[list(input())for i in range(h)]
a=[[float("inf")]*w for i in range(h)]
b=[[False]*w for i in range(h)]
def f(x,y,t):
    if 0<=x<h and 0<=y<w:
        if s[x][y]=="#":
            if b[x][y]==False:
                a[x][y]=0
                b[x][y]=True
                f(x,y+1,1)
                f(x+1,y,1)
                f(x-1,y,1)
                f(x,y-1,1)
        else:
            if a[x][y]>t:
                a[x][y]=t
                f(x,y+1,t+1)
                f(x+1,y,t+1)
                f(x-1,y,t+1)
                f(x,y-1,t+1)
for i in range(h):
    for j in range(w):
        if s[i][j]=="#":
            f(i,j,0)
            break
print(max(max(i)for i in a))

Fixed submission:
import numpy as np
from scipy.ndimage import distance_transform_cdt as d
h,w=map(int,input().split())
s=[[1 if i=="." else 0 for i in input()]for i in range(h)]
a=d(s,metric='taxicab')
print(a.max())

Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(10**7)
h,w=map(int,input().split())
s=[list(input())for i in range(h)]
a=[[float("inf")]*w for i in range(h)]
def f(x,y,t):
    if 0<=x<h and 0<=y<w:
        if s[x][y]=="#":
            a[x][y]=0
            f(x,y+1,1)
            f(x+1,y,1)
            f(x-1,y,1)
            f(x,y-1,1)
        else:
            if a[x][y]>t:
                a[x][y]=t
                f(x,y+1,t+1)
                f(x+1,y,t+1)
                f(x-1,y,t+1)
                f(x,y-1,t+1)
for i in range(h):
    for j in range(w):
        if s[i][j]=="#":
            f(i,j,0)
            break
print(max(max(i)for i in a))

Fixed submission:
import numpy as np
from scipy.ndimage import distance_transform_cdt as d
h,w=map(int,input().split())
s=[[1 if i=="." else 0 for i in input()]for i in range(h)]
a=d(s,metric='taxicab')
print(a.max())