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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define maxN 52
  4. char a[maxN][maxN];
  5. int visited[maxN][maxN];
  6. int mark[maxN][maxN];
  7. bool lake;
  8. int numadj,n,m;
  9. vector < pair <int, pair <int,int> > > v;
  10. void checklake(int x,int y)
  11. {
  12.     visited[x][y]=1;
  13.     numadj++;
  14.     if(x==0||x==n-1||y==m-1||y==0)
  15.     {
  16.         lake=false;
  17.         return ;
  18.     }
  19.     if(!visited[x][y+1]&&a[x][y+1]=='.')checklake(x,y+1);
  20.     if(!visited[x][y-1]&&a[x][y-1]=='.')checklake(x,y-1);
  21.     if(!visited[x+1][y]&&a[x+1][y]=='.')checklake(x+1,y);
  22.     if(!visited[x-1][y]&&a[x-1][y]=='.')checklake(x-1,y);
  23. }
  24.  
  25. void ffill(int x,int y)
  26. {
  27.     a[x][y]='*';
  28.     mark[x][y]=1;
  29.     if(a[x][y+1]=='.'&&!mark[x][y+1])ffill(x,y+1);
  30.     if(a[x][y-1]=='.'&&!mark[x][y-1])ffill(x,y-1);
  31.     if(a[x+1][y]=='.'&&!mark[x+1][y])ffill(x+1,y);
  32.     if(a[x-1][y]=='.'&&!mark[x-1][y])ffill(x-1,y);
  33. }
  34. int main() {
  35.     std::ios::sync_with_stdio(false);
  36. 	int k,ans=0;
  37. 	cin>>n>>m>>k;
  38. 	for(int i=0;i<n;i++)
  39. 	{
  40. 	    for(int j=0;j<m;j++)
  41. 	    { 
  42. 	        cin>>a[i][j];
  43.  
  44. 	    }
  45. 	}
  46. 		for(int i=0;i<n;i++)
  47. 	{
  48. 	    for(int j=0;j<m;j++)
  49. 	    { 
  50.  
  51. 	       visited[i][j]=0;
  52. 	        mark[i][j]=0;
  53. 	    }
  54. 	}
  55.  
  56. 	for(int i=0;i<n;i++)
  57. 	{
  58. 	    for(int j=0;j<m;j++)
  59. 	    {   numadj=0;
  60. 	        if(a[i][j]=='.'&&!visited[i][j])
  61. 	        {   lake=true;
  62. 	            checklake(i,j);
  63.  
  64. 	            if(lake)
  65. 	            {
  66. 	                v.push_back({numadj,{i,j}});
  67. 	            }
  68. 	        }
  69. 	    }
  70. 	}
  71. 	sort(v.begin(),v.end());
  72.  
  73. 	for(int i=0;i<v.size()-k;i++)
  74. 	{
  75. 	    ans+=v[i].first;
  76. 	    ffill(v[i].second.first,v[i].second.second);
  77. 	}
  78. 	cout<<ans<<endl;
  79. 		for(int i=0;i<n;i++)
  80. 	{
  81. 	    for(int j=0;j<m;j++)
  82. 	    { 
  83. 	        cout<<a[i][j];
  84. 	    }
  85. 	    cout<<endl;
  86. 	}
  87. 	return 0;
  88. }
  89.  
Success #stdin #stdout 0s 3492KB
comments (?)
stdin
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5 4 1
****
*..*
****
**.*
..**
stdout
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1
****
*..*
****
****
..**
https://ideone.com/VtXhW5
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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