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  1. /*
  2. *************************************************************************
  3. * $ Author : honeyslawyer   $
  4. * $ Name   : shashank gupta $
  5. *************************************************************************
  6. *
  7. * Copyright 2013 @ honeyslawyer and shashank gupta
  8. *
  9. ************************************************************************/
  10. #include<cstdio>
  11. #include<iostream>
  12. #include<cmath>
  13. //#include<conio.h>
  14. #include<cstring>
  15. #include<ctype.h>
  16. #include<algorithm>
  17. #include<vector>
  18. #include<stdlib.h>
  19. #include<map>
  20. #include<queue>
  21. #include<stack>
  22. #include<set>
  23. #include<string>
  24. #include<climits>
  25.  
  26. #define mod 1000000007
  27. #define ll long long
  28.  
  29. using namespace std;
  30. ll gcd(ll a,ll b) {if(b==0) return a; return gcd(b,a%b);}
  31.  
  32. ll power(ll b,ll exp,ll m)
  33.  {ll ans=1;
  34.   b%=m;
  35.   while(exp)
  36.    {if(exp&1)
  37.      ans=(ans*b)%m;
  38.     exp>>=1;
  39. 	b=(b*b)%m;
  40.    }
  41.   return ans;
  42.  }
  43. char a[400][400];
  44. int main()
  45. {
  46.   int n;
  47.   char b;
  48.   scanf("%d",&n);
  49.   scanf("%c",&b);
  50.  
  51.   for(int i=0;i<n;i++)
  52.   gets(a[i]);
  53.  
  54.   for(int i=1;i<n-1;i++)
  55.   {
  56.         for(int j=1;j<n-1;j++)
  57.         {
  58.             if(a[i][j]=='#')
  59.             {
  60.                 if(a[i-1][j]=='#'&&a[i+1][j]=='#'&&a[i][j-1]=='#'&&a[i][j+1]=='#')
  61.                 {
  62.                     a[i][j]='.';
  63.                     a[i-1][j]='.';
  64.                      a[i+1][j]='.';
  65.                       a[i][j-1]='.';
  66.                        a[i][j+1]='.';
  67.                     }
  68.             }
  69.         }
  70.     }
  71.   for(int i=0;i<n;i++)
  72.   {
  73.         for(int j=0;j<n;j++)
  74.         {
  75.             if(a[i][j]=='#')
  76.             {
  77.                 printf("NO\n");
  78.                 return 0;
  79.             }
  80.         }
  81.     }
  82.   printf("YES\n");
  83.  
  84. //getch();
  85. return 0;
  86. /*checklist
  87. 1)getch() and conio.h removed.*/
  88. }
  89.  
Success #stdin #stdout 0s 3456KB
comments ()
stdin 
5
.#...
####.
.####
...#.
.....
stdout 
YES
https://ideone.com/lUO7hG
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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