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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main()
  5. {
  6.     int m,n;
  7.     cin>>m>>n;
  8.  
  9.     int mat[m][n];
  10.  
  11.  
  12.     for(int i=0;i<m;i++)
  13.     {
  14.         for(int j=0;j<n;j++)
  15.         {
  16.             cin>>mat[i][j];
  17.         }
  18.     }
  19.  
  20.  
  21.     //first row 
  22.  
  23.     int row_sum=0;
  24.  
  25.     for(int i=0;i<=0;i++)
  26.     {
  27.         for(int j=0;j<n;j++)
  28.         {
  29.             row_sum+=mat[i][j];
  30.         }
  31.     }
  32.  
  33.     //last row 
  34.  
  35.     int last_sum=0;
  36.  
  37.     for(int j=n-1;j>=n-1;j--)
  38.     {
  39.         for(int i=0;i<m;i++)
  40.         {
  41.             last_sum+=mat[j][i];
  42.         }
  43.     }
  44.  
  45.     //diagonal row
  46.  
  47.     int diag_sum=0;
  48.  
  49.     for(int i=0;i<m;i++)
  50.     {
  51.         for(int j=0;j<n;j++)
  52.         {
  53.             if((i+j)==m-1)
  54.             diag_sum+=mat[i][j];
  55.  
  56.             if(j==0 && i==m-1)
  57.             last_sum=last_sum-mat[i][j];
  58.  
  59.             if(i==0 && j==n-1)
  60.             row_sum=row_sum-mat[i][j];
  61.         }
  62.  
  63.     }
  64.  
  65.     cout<<diag_sum<<endl;
  66.     cout<<row_sum<<endl;
  67.     cout<<last_sum<<endl;
  68.  
  69.     int tot_sum=row_sum+last_sum+diag_sum;
  70.  
  71.     cout<<tot_sum<<endl;
  72.  
  73.     return 0;
  74. }
Success #stdin #stdout 0s 4376KB
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stdin
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stdout
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https://ideone.com/z0w4qH
language:
C++ (gcc 8.3)
created:
4 years ago
visibility:
public

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