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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. typedef long long ll;
  4.  
  5. const ll MOD = 1e9 + 7;
  6.  
  7. int n;
  8. ll ans = 0;
  9. int main() {
  10.     ios_base::sync_with_stdio(0); cin.tie(0);
  11.     freopen("MAGICSUM.inp", "r", stdin);
  12.     freopen("MAGICSUM.out", "w", stdout);
  13.     int n; cin >> n;
  14.     for(int i = 1, x, y; i <= n; i++){
  15.         cin >> x >> y;
  16.         ans += (y * (y + 1)) / 2;
  17.         ans -= (x * (x - 1)) / 2;
  18.     }
  19.     cout << ans << endl;
  20. }
  21.  
Success #stdin #stdout 0.01s 5348KB
comments (?)
stdin 
Standard input is empty
stdout 
Standard output is empty
https://ideone.com/dOwjm6
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
secret

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