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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int n;
  5. const int MAX_N = 1e6 + 5;
  6. pair<long long, long long> arr[MAX_N];
  7.  
  8.  
  9. bool cmp(pair<long long, long long> x, pair<long long, long long> y)
  10. {
  11.     return max(x.first, x.first + y.first - x.second) < max(y.first, x.first + y.first - y.second);
  12. }
  13.  
  14. int main()
  15. {
  16.     ios_base::sync_with_stdio(false);
  17.     cin.tie(0);
  18.     cout.tie(0);
  19.  
  20.     while(cin >> n)
  21.     {
  22.         for (int i = 0; i < n; ++i)
  23.             cin >> arr[i].first >> arr[i].second;
  24.         sort(arr, arr + n, cmp);
  25.  
  26.         long long ans = 0, s = 0;
  27.         for (int i = 0; i < n; ++i)
  28.         {
  29.             long long need = arr[i].first - s;
  30.             if (need > 0)
  31.             {
  32.                 ans += need;
  33.                 s += need;
  34.             }
  35.             s += arr[i].second - arr[i].first;
  36.         }
  37.         cout << ans << '\n';
  38.     }
  39.     return 0;
  40. }
Success #stdin #stdout 0s 4472KB
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https://ideone.com/64kU5M
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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