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  1. #include <bits/stdc++.h>
  2. typedef long long ll;
  3. using namespace std;
  4. #define mp make_pair
  5. long long n,x;
  6. vector<pair<ll,pair<pair<ll,ll>,ll > > > v;
  7. vector<ll> da;
  8. int main()
  9. {
  10.     ios_base::sync_with_stdio(false);
  11.     cin.tie(NULL);
  12.     cin >> n >> x;
  13.     bool fo = false;
  14.     v.resize(n);
  15.     da.resize(n);
  16.     for(int i =0;i<n;i++)
  17.     {
  18.         long long a,b,c;
  19.         cin >> a >> b >> c;
  20.         v[i] = mp(b-a+1,mp(mp(a,b),c));
  21.     }
  22.     sort(v.begin(),v.end());
  23.     for(int i=0;i<n;i++) da[i] = v[i].first;
  24.     ll ans = 1e16;
  25.     for(int i=0;i<n;i++)
  26.     {
  27.         ll d = v[i].first;
  28.         if(d == x)
  29.         {
  30.             ans = min(ans,v[i].second.second); continue;
  31.         }
  32.         if(d > x)
  33.         {
  34.             break;
  35.         }
  36.         vector<ll>::iterator it = lower_bound(da.begin()+i,da.end(),x - d);
  37.  
  38.         ll pos = it - da.begin();
  39.  
  40.         if(*it == x - d)
  41.         {
  42.  
  43.             int j = pos;
  44.  
  45.             while(da[j] == x - d && j < n)
  46.             {
  47.                 if(v[i].second.first.second < v[j].second.first.first || v[j].second.first.second < v[i].second.first.first)
  48.                     {
  49.                         fo = true;
  50.                         ans = min(ans,v[i].second.second + v[j].second.second);
  51.                     }
  52.                     j++;
  53.             }
  54.         }
  55.     }
  56.     //cout << ans << endl;
  57.     if(fo)
  58.         cout << ans << endl;
  59.     else
  60.         cout << "-1\n";
  61.     return 0;
  62. }
  63.  
Success #stdin #stdout 0s 15248KB
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https://ideone.com/U1AkWq
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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