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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define el "\n"
  4. #define ll long long
  5. #define ull unsigned long long
  6. #define se second
  7. #define fi first
  8. #define be begin()
  9. #define en end()
  10. #define Faster cin.tie(0); cout.tie(0); ios_base::sync_with_stdio(0);
  11.  
  12. int main()
  13. {
  14.     Faster;
  15.     int n; cin >> n;
  16.     int a[n][n];
  17.     int dem  = 1;
  18.     ll ans = 0;
  19.     for(int i = 0; i < n; i++)
  20.     {
  21.         for(int j = 0; j < n; j++)
  22.         {
  23.             a[i][j] = dem ++;
  24.             //cout << a[i][j] << " ";
  25.             if(i == j) ans += a[i][j];
  26.         }
  27.         //cout << el;
  28.     }
  29.     cout << ans;
  30.     return 0;
  31. }
  32.  
Success #stdin #stdout 0s 5288KB
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https://ideone.com/JQHcok
language:
C++14 (gcc 8.3)
created:
11 hours ago
visibility:
public

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