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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. typedef long long ll;
  5. typedef pair<ll, ll> PII;
  6. typedef vector<int> VI;
  7.  
  8. #define MAXN 200001
  9. #define pb push_back
  10. #define mp make_pair
  11. #define MOD (ll)1e9+7
  12. #define FASTIO ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  13. #define rep(i, a, b) for(int i = a; i < b; ++i)
  14.  
  15. int n, x;
  16. vector<pair<PII, PII> > a;
  17.  
  18. int main() {
  19.     FASTIO
  20.     cin >> n >> x;
  21.     rep(i, 0, n) {
  22.         int l, r, cost;
  23.         cin >> l >> r >> cost;
  24.         a.pb(mp(mp(r-l+1, cost), mp(l, r)));
  25.     }
  26.     sort(a.begin(), a.end());
  27.     ll ans = 30000000000000;
  28.     int cc = 0;
  29.     int i = 0, j = n-1;
  30.     for(i = 0; i < n; ) {
  31.         int dur1 = a[i].first.first;
  32.         int dur2 = a[j].first.first;
  33.         ll cost = a[i].first.second + a[j].first.second;
  34.         if(i == j)
  35.             break;
  36.         if(dur1+dur2 > x) {
  37.             --j;
  38.         }
  39.         else if(dur1+dur2 == x) {
  40.             if(a[i].second.first > a[j].second.second || a[j].second.first > a[i].second.second)
  41.                 ans = min(ans, cost);
  42.             --j;
  43.         }
  44.         else
  45.             ++i;
  46.     }
  47.     if(ans == 30000000000000)
  48.         ans = -1;
  49.     cout << ans;
  50. }
  51.  
Success #stdin #stdout 0s 16056KB
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https://ideone.com/BU1KjQ
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
secret

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