Submission #998594

#	Time	Username	Problem	Language	Result	Execution time	Memory
998594		vjudge1	Jobs (BOI24_jobs)	C++17	14 / 100	2056 ms	49744 KiB

Main

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const ll INF = 2e18;

void DFS(int v, vector<vector<int>>& adj, vector<ll>& dp, vector<int>& x, ll minPre, ll currSum, int start){
	currSum += x[v];
	minPre = min(minPre, currSum);
	if(currSum >= 0){
		dp[start] = min(dp[start], -minPre);
	}
	for(int node : adj[v]){
		DFS(node, adj, dp, x, minPre, currSum, start);
	}
}

signed main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);

	int N; ll s; cin >> N >> s;
	ll orgs = s;
	vector<int> x(N), p(N);
	vector<vector<int>> adj(N);
	for(int i = 0; i < N; i++){
		cin >> x[i] >> p[i]; p[i]--;
		if(p[i] != -1){
			adj[p[i]].push_back(i);
		}
	}
	vector<ll> dp(N, INF);
	for(int i = 0; i < N; i++){
		DFS(i, adj, dp, x, 0, 0, i);
	}
	priority_queue<pair<ll, int>> q;
	for(int i = 0; i < N; i++){
		if(p[i] == -1){
			q.push({-dp[i], i});
		}
	}
	while(!q.empty() && -q.top().first <= s){
		int v = q.top().second; q.pop();
		s += x[v];
		for(int node : adj[v]){
			q.push({-dp[node], node});
		}
	}
	cout << s - orgs << "\n";
}

• Subtask 1: 0 / 11
• Subtask 2: 14 / 14
• Subtask 3: 0 / 15
• Subtask 4: 0 / 29
• Subtask 5: 0 / 31