Submission #388722

#	Time	Username	Problem	Language	Result	Execution time	Memory
388722		Iwanttobreakfree	Fountain (eJOI20_fountain)	C++17	30 / 100	1573 ms	5168 KiB

fountain

#include <iostream>
#include <vector>
#include <set>
using namespace std;
int main(){
    int n,q,li,num;
    cin>>n>>q;
    int men=1e9;
    vector<pair<int,int> >fuen(n);
    vector<vector<int> >cone(n,vector<int>());
    set<int> s;
    set<int>borrar;
    for(int i=0;i<n;i++){
        cin>>fuen[i].second>>fuen[i].first;
        if(fuen[i].second<=men){
            men=fuen[i].second;
            s.insert(i);
        }
        else{
        s.insert(i);
            for(auto it=s.begin();it!=s.end();it++){
            //cout<<*it<<' ';
                if(fuen[*it].second<fuen[i].second){
                    cone[*it].push_back(i);
                    //cout<<*it<<' '<<i<<' ';
                    borrar.insert(*it);
                }
            }
            for(int x:borrar)s.erase(x);
            //cout<<'\n';
        }
    }
    bool sol=true;
    while(q--){
        cin>>num>>li;
        num--;
        sol=true;
        while(true){
        //cout<<num<<' '<<li<<' ';
        li-=fuen[num].first;
        if(li<1)break;
            if(cone[num].empty()){
                sol=false;
                break;
            }
            else{
                for(int x:cone[num]){
                    num=x;
                }
            }
        }
        if(!sol)cout<<0<<'\n';
        else cout<<num+1<<'\n';
    }
}

• Subtask 1: 30 / 30
• Subtask 2: 0 / 30
• Subtask 3: 0 / 40