Submission #465765

#	Time	Username	Problem	Language	Result	Execution time	Memory
465765		okaragul	Fountain (eJOI20_fountain)	C++17	30 / 100	1579 ms	23612 KiB

fountain

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define endl "\n"
#define all(aa) aa.begin(), aa.end()

int main(){
	int n, q;
	cin>>n>>q;

	vector<pair<int, int>> a(n);
	for(auto &[d, c]:a) cin>>d>>c;

	vector<vector<pair<int, int>>> par(n+1, vector<pair<int, int>>(20));
	stack<int> s;
	for(int i = n; i > 0; i--){
		while(s.size() && a[s.top()-1].first<=a[i-1].first) s.pop();
		par[i][0]={(s.empty() ? 0:s.top()), a[i-1].second};
		s.push(i);
	}

	for(int i = 1; i < 20; i++) for(int v = 1; v <= n; v++)
		par[v][i]={par[par[v][i-1].first][i-1].first, par[par[v][i-1].first][i-1].second+par[v][i-1].second}; 
		
	while(q--){
		int v, d;
		cin>>v>>d;

		int l=0, r=n+1;
		while(l<r){
			int mid=(l+r)/2, cur=0, dist=0, nd=v;
			for(int i = 19; i >= 0; i--) if(cur+(1<<i)<=mid){
				cur+=(1<<i);
				dist+=par[nd][i].second;
				nd=par[nd][i].first; 
			}
			if(dist<d) l=mid+1;
			else r=mid;
		}
		l--; 
		for(int i = 19; i >= 0; i--) if(l-(1<<i)>=0)
			l-=(1<<i), v=par[v][i].first; 
		
		cout<<v<<endl;
	}
	
}

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