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  1. #include <bits/stdc++.h>
  2.  
  3. #define ll long long
  4. #define el cout << '\n'
  5. #define ii pair<ll, ll>
  6. #define fi first
  7. #define se second
  8.  
  9. using namespace std;
  10.  
  11. const int maxn = 4e5;
  12.  
  13. int n;
  14. ii a[2 * maxn + 10];
  15. ll ans = 0;
  16.  
  17. bool cmp(ii a, ii b)
  18. {
  19.     return a.se - a.fi < b.se - b.fi;
  20. }
  21.  
  22. int main()
  23. {
  24.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  25.     if (fopen("ACM.INP", "r"))
  26.     {
  27.         freopen("ACM.INP", "r", stdin);
  28.         freopen("ACM.OUT", "w", stdout);
  29.     }
  30.  
  31.     cin >> n;
  32.     for (int i = 1; i <= 2 * n; i++)
  33.     {
  34.         cin >> a[i].fi >> a[i].se;
  35.         ans += a[i].fi;
  36.     }
  37.     sort(a + 1, a + 2 * n + 1, cmp);
  38.     for (int i = 1; i <= n; i++)
  39.         ans += a[i].se - a[i].fi;
  40.     cout << ans;
  41. }
Success #stdin #stdout 0.01s 5292KB
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stdout
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https://ideone.com/B0TfKo
language:
C++14 (gcc 8.3)
created:
10 days ago
visibility:
public

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