This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
const int dx[4] = {1,0,-1,0}, dy[4] = {0,1,0,-1};
#define OVL(x,s) for(auto y:x) cout<<y<<s; cout<<"\n";
#ifdef IOI
void dbg_out() { cout << endl; }
template<typename Head, typename... Tail> void dbg_out(Head H, Tail... T) { cout << ' ' << H; dbg_out(T...); }
#define dbg(...) cout << "(" << #__VA_ARGS__ << "):", dbg_out(__VA_ARGS__);
#else
#define dbg(...) 1337;
#endif
#define endl "\n"
#define pb push_back
#define F first
#define S second
#define ll long long
#define mod 1000000007
#define all(v) v.begin(),v.end()
#pragma GCC optimize("Ofast,unroll-loops")
#pragma GCC target("avx,avx2,bmi,bmi2,popcnt,lzcnt")
signed main(){
ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
int n;
cin>>n;
vector<vector<int>> v(n);
for(int i=0;i<n;i++){
int a,b,c;
cin>>a>>b>>c;
v[i]={a,b,c};
}
sort(all(v),[&](const auto p1,const auto p2){
if(p1[0]==p2[0]){
if(p1[1]==p2[1]) return p1[2]>p2[1];
else return p1[1]>p2[1];
}
return p1[0]>p2[0];
});
int ans=0;
// for(auto x:v){
// dbg(x[0],x[1],x[2])
// }
vector<pair<int,int>> a;
for(int i=0;i<n;i++){
a.emplace_back(v[i][1],v[i][2]);
}
sort(all(a),greater<pair<int,int>>());
for(int i=0;i<n;i++){
for(int j=i;j<n;j++){
if(v[j][0]!=v[i][0]) break;
if(find(all(a),make_pair(v[j][1],v[j][2]))!=a.end())
a.erase(find(all(a),make_pair(v[j][1],v[j][2])));
}
if(a.empty()) break;
int x=a.size();
int suff[x];
for(int i=x-1;i>=0;i--){
suff[i]=a[i].S;
if(i!=x-1) suff[i]=max(suff[i],suff[i+1]);
}
for(int j=0;j<x;j++){
int mn=a[j].S;
if(j+1>=x) continue;
int f=suff[j+1];
if(f>mn) ans=max(ans,f+a[j].F+v[i][0]);
}
}
if(ans==0){
cout<<-1<<endl;
return 0;
}
cout<<ans<<endl;
}
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