Buggy python submission (verdict: Runtime Error):
h,w=map(int,input().split())
s=[list(input()) for i in range(h)]
flag=True
count=0
for i in range(h):
  if flag==False:
    break
  for j in range(w):
    if s[i][j]=="#":
      if i>0 and s[i-1][j]!="#":
        flag=False
      elif i>0 and s[i-1][j]=="#":
        flag2=True
        
      if i<(h-1) and s[i+1][j]!="#":
        flag=False
      elif i<(h-1) and s[i+1][j]=="#":
        flag2=True
        
      if j>0 and s[i][j-1]!="#":
        flag=False
      elif j>0 and s[i][j-1]=="#":
        flag2=True
        
      if j<(w-1) and s[i][j+1]!="#":
        flag=False
      elif j<(w-1) and s[i][j+1]=="#":
        flag2=True
      if flag2:
        flag=True
    else:
      count+=1
        
if h==1 and w==1:
  if s[0][0]=="#":
    flag=False
    
if count==(h*w):
  flag=True
  
if flag:
  print("Yes")
else:
  print("No")

Fixed submission:
h,w=map(int,input().split())
s=[list(input()) for i in range(h)]
flag=True
count=0
for i in range(h):
  if flag==False:
    break
  for j in range(w):
    if flag==False:
      break
    flag2=False
    if s[i][j]=="#":
      if i>0 and s[i-1][j]!="#":
        flag=False
      elif i>0 and s[i-1][j]=="#":
        flag2=True
        
      if i<(h-1) and s[i+1][j]!="#":
        flag=False
      elif i<(h-1) and s[i+1][j]=="#":
        flag2=True
        
      if j>0 and s[i][j-1]!="#":
        flag=False
      elif j>0 and s[i][j-1]=="#":
        flag2=True
      
      if j<(w-1) and s[i][j+1]!="#":
        flag=False
      elif j<(w-1) and s[i][j+1]=="#":
        flag2=True
      if flag2:
        flag=True
    else:
      count+=1
        
if h==1 and w==1:
  if s[0][0]=="#":
    flag=False
    
if count==(h*w):
  flag=True
  
if flag:
  print("Yes")
else:
  print("No")

Buggy python submission (verdict: Runtime Error):
h,w=map(int,input().split())
s=[list(input()) for i in range(h)]
flag=True
count=0
for i in range(h):
  if flag==False:
    break
  for j in range(w):
    if s[i][j]=="#":
      if i>0 and s[i-1][j]!="#":
        flag=False
      elif i> and s[i-1][j]=="#":
        flag=True
        break
        
      if i<(h-1) and s[i+1][j]!="#":
        flag=False
      elif i<(h-1) and s[i+1][j]=="#":
        flag=True
        break
        
      if j>0 and s[i][j-1]!="#":
        flag=False
      elif j>0 and s[i][j-1]=="#":
        flag=True
        break
        
      if j<(w-1) and s[i][j+1]!="#":
        flag=False
      elif j<(w-1) and s[i][j+1]=="#":
        flag=True
        break
    else:
      count+=1
        
if h==1 and w==1:
  if s[0][0]=="#":
    flag=False
    
if count==(h*w):
  flag=True
  
if flag:
  print("Yes")
else:
  print("No")

Fixed submission:
h,w=map(int,input().split())
s=[list(input()) for i in range(h)]
flag=True
count=0
for i in range(h):
  if flag==False:
    break
  for j in range(w):
    if flag==False:
      break
    flag2=False
    if s[i][j]=="#":
      if i>0 and s[i-1][j]!="#":
        flag=False
      elif i>0 and s[i-1][j]=="#":
        flag2=True
        
      if i<(h-1) and s[i+1][j]!="#":
        flag=False
      elif i<(h-1) and s[i+1][j]=="#":
        flag2=True
        
      if j>0 and s[i][j-1]!="#":
        flag=False
      elif j>0 and s[i][j-1]=="#":
        flag2=True
      
      if j<(w-1) and s[i][j+1]!="#":
        flag=False
      elif j<(w-1) and s[i][j+1]=="#":
        flag2=True
      if flag2:
        flag=True
    else:
      count+=1
        
if h==1 and w==1:
  if s[0][0]=="#":
    flag=False
    
if count==(h*w):
  flag=True
  
if flag:
  print("Yes")
else:
  print("No")

Buggy python submission (verdict: Runtime Error):
h,w=map(int,input().split())
s=[list(input()) for i in range(h)]
flag=True
if h==1 and w==1:
  flag=False
for i in range(h):
  if flag==False:
    break
  for j in range(w):
    if s[i][j]=="#":
      if i!=0 and s[i-1][j]!="#":
        flag=False
      elif i!=0 and s[i-1][j]=="#":
        flag=True
        break
      if i!=(h-1) and s[i+1][j]!="#":
        flag=False
      elif i!=(h-1) and s[i+1][j]=="#":
        flag=True
        break
      if j!=0 and s[i][j-1]!="#":
        flag=False
      elif j!=0 and s[i+1][j]=="#":
        flag=True
        break
      if j!=(w-1) and s[i][j+1]!="#":
        flag=False
      elif j!=(w-1) and s[i+1][j]=="#":
        flag=True
        break
if h==1 and w==1:
  flag=False
  
if flag:
  print("Yes")
else:
  print("No")

Fixed submission:
h,w=map(int,input().split())
s=[list(input()) for i in range(h)]
flag=True
count=0
for i in range(h):
  if flag==False:
    break
  for j in range(w):
    if flag==False:
      break
    flag2=False
    if s[i][j]=="#":
      if i>0 and s[i-1][j]!="#":
        flag=False
      elif i>0 and s[i-1][j]=="#":
        flag2=True
        
      if i<(h-1) and s[i+1][j]!="#":
        flag=False
      elif i<(h-1) and s[i+1][j]=="#":
        flag2=True
        
      if j>0 and s[i][j-1]!="#":
        flag=False
      elif j>0 and s[i][j-1]=="#":
        flag2=True
      
      if j<(w-1) and s[i][j+1]!="#":
        flag=False
      elif j<(w-1) and s[i][j+1]=="#":
        flag2=True
      if flag2:
        flag=True
    else:
      count+=1
        
if h==1 and w==1:
  if s[0][0]=="#":
    flag=False
    
if count==(h*w):
  flag=True
  
if flag:
  print("Yes")
else:
  print("No")