Submission #383727

#	Time	Username	Problem	Language	Result	Execution time	Memory
383727		MODDI	Fountain (eJOI20_fountain)	C++14	100 / 100	903 ms	19040 KiB

fountain

#include <bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
#define vi vector<int>
#define vl vector<ll>
#define mp make_pair
#define pb push_back
using namespace std;
const int MAXN = 100050;
const int LOG = 20;
int diameter[MAXN], liters[MAXN], up[MAXN][LOG], sum[MAXN][LOG];
int main(){
	int n, q;
	cin>>n>>q;
	for(int i = 1; i <= n; i++){
		cin>>diameter[i]>>liters[i];
	}
	priority_queue<pii> pq;
	for(int i = 1; i <= n; i++){
		while(!pq.empty() && -pq.top().first < diameter[i])
			up[pq.top().second][0] = i, pq.pop();
			
		pq.push({-diameter[i], i});
	}
	while(!pq.empty())
		up[pq.top().second][0] = 0, pq.pop();
	
	for(int i = 1; i <= n; i++)
		sum[i][0] = liters[i];
	for(int j = 1; j < LOG; j++){
		for(int i = 0; i <= n; i++){
			up[i][j] =up[up[i][j-1]][j-1];
			sum[i][j] = sum[i][j-1] + sum[up[i][j-1]][j-1];
		}
	}
	while(q--){
		int a, b;
		cin>>a>>b;
		for(int j = LOG - 1; j >= 0; j--){
			if(sum[a][j] >= b)
				continue;
			b -= sum[a][j];
			a = up[a][j];
		}
		cout<<a<<endl;
	}
	return 0;
}

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