제출 #1083895

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1083895		raczek	Jobs (BOI24_jobs)	C++17	0 / 100	1 ms	860 KiB

Main

#include<bits/stdc++.h>
using namespace std;
#ifdef DEBUG
auto&operator <<(auto& o, pair<auto, auto> p) {return o<<"("<<p.first<<", "<<p.second<<")";}
auto operator <<(auto& o, auto x)->decltype(x.end(), o) {o<<"{"; for(auto v : x) o<<v<<", "; return o<<"}";}
#define debug(X) cout<<"["#X"]"<<X<<endl;
#else
#define debug(X) {}
#endif
#define int long long
const long long INF = numeric_limits<long long>::max();
const int MAXN = 2001;
vector<vector<int> > graph(MAXN);
vector<int> cost(MAXN);
vector<int> ms(MAXN);
void dfs(int b)
{
	priority_queue<pair<int, int> > q;
	for(auto v : graph[b]) {dfs(v); q.push({-ms[v], v});};
	if(cost[b] >= 0) return;
	ms[b] = -cost[b];
	int akt = cost[b];
	while(!q.empty())
	{
		auto a = q.top().second;
		q.pop();
		if(ms[a] == INF) break;
		ms[b] = max(ms[b], ms[b] - cost[a]); 
		akt += cost[a];
		if(akt >= 0) break; 
		for(auto v : graph[a]) q.push({-ms[v], v}); 
	}
	if(akt < 0) ms[b] = INF;
}
int32_t main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	int n, s;
	cin>>n>>s;
	for(int i=1;i<=n;i++)
	{
		int c, p;
		cin>>c>>p;
		graph[p].push_back(i);
		cost[i] = c;
	}	
	dfs(0);
	debug(ms);
	int org = s;
	priority_queue<pair<int, int> > q;
	q.push({0, 0});
	while(!q.empty())
        {
                auto a = q.top().second;
                q.pop();
		if(ms[a] > s) break;
		if(s + cost[a] < 0) break;
		s += cost[a];
                for(auto v : graph[a]) q.push({-ms[v], v});                              
        }
	cout<<s - org;
}

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