Submission #1627471

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Source Code Expand

#include<bits/stdc++.h>
#define ll long long
#define fi first
#define se second
using namespace std;

int n,m;
ll a[100001];
ll s[100001]; 
const ll inf=999999999;


int main(){
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.precision(10);
  cout<<fixed;
#ifdef LOCAL_DEFINE
    freopen("in", "r", stdin);
    freopen("out","w",stdout);
#endif
  cin>>n>>m;
  ll sum=0;
  for(int i=0;i<n;i++){
    int r,l,b;cin>>l>>r>>b;
    r--;l--;
    a[l]+=b;
    a[r+1]-=b;
    sum+=b;
  }
  s[0]=a[0];
  for(int i=1;i<m;i++){
    s[i]+=a[i]+s[i-1];
  }
  ll mina=inf;
  for(int i=0;i<m;i++){
    mina=min(mina,s[i]);
  }
  cout<<sum-mina<<endl;
#ifdef LOCAL_DEFINE
    cerr << "Time elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << " s.\n";
#endif
  return 0;
}

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