Submission #909869

#	Time	Username	Problem	Language	Result	Execution time	Memory
909869		kachu	Fountain (eJOI20_fountain)	C++17	30 / 100	72 ms	12268 KiB

fountain

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

#define oset tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> 
#define ofind find_by_order
#define okey order_of_key

#define int long long
#define double long double
#define pque priority_queue
#define dque deque
#define que queue
#define umap unordered_map
#define uset unordered_set
#define pipii pair<int, pair<int,int>>
#define pii pair<int,int>
#define mp make_pair
#define pb push_back
#define ppb pop_back
#define pf push_front
#define ppf pop_front
#define iter iterator
#define endl '\n'
#define MOD 1000000007
#define INF 1e18 

int32_t main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	
	int N, Q;
	cin >> N >> Q;
	int D[N + 1], C[N + 1];
	
	for (int i = 1; i <= N; i++)
		cin >> D[i] >> C[i];
	
	int next[N + 1];
	stack<int> st;
	
	for (int i = N; i >= 1; i--){
		while (!st.empty() && D[st.top()] <= D[i])
			st.pop();
		
		if (!st.empty())
			next[i] = st.top();
		else
			next[i] = 0;
		
		st.push(i);
	}
	
	vector<pii> query[N + 1];
	int ans[Q];
	
	for (int i = 0; i < Q; i++){
		int a, x;
		cin >> a >> x;
		query[a].pb(mp(x, i));
	}

	bool visited[N + 1];
	memset(visited, 0, sizeof visited);
	
	for (int i = 1; i <= N; i++){
		if (visited[i]) continue;
		
		pque<pii, vector<pii>, greater<pii>> pq;
		int ptr = i, prev = 0, cap = 0;
		
		while (ptr != 0){
			if (visited[ptr]) break;
			visited[ptr] = 1;
			cap += C[ptr];
			
			for (auto qu : query[ptr])
				pq.push(mp(qu.first + prev, qu.second));
			
			while (!pq.empty() && pq.top().first <= cap){
				int qid = pq.top().second;
				pq.pop();
				ans[qid] = ptr;
			}
			
			prev += C[ptr];
			ptr = next[ptr];
		}
		
		while (!pq.empty()){
			int qid = pq.top().second;
			pq.pop();
			ans[qid] = 0;
		}
	}
	
	for (int i = 0; i < Q; i++)
		cout << ans[i] << endl;

	return 0;
}

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