Submission #996609

#	Time	Username	Problem	Language	Result	Execution time	Memory
996609		jj_master	Jobs (BOI24_jobs)	C++17	100 / 100	200 ms	70860 KiB

Main

/** Baltic Olympiad in Informatics 2024 **/
 
#include <bits/stdc++.h>
using namespace std;
#define int long long

const int maxn = 300001;
vector<int> adj[maxn];
int a[maxn];

priority_queue<pair<int, int>, vector<pair<int, int>>, greater<pair<int, int>>> v[maxn];
 
void dfs(int x) {
	for(int i : adj[x]) {
		dfs(i);
		if(v[i].size() > v[x].size()) {
      swap(v[i], v[x]);
    }
		while(v[i].size()) {
			v[x].push(v[i].top());
			v[i].pop();
		}
	}
	if(a[x] >= 0) {
    v[x].push({0, a[x]});
  }	else {
		pair<int, int> cur = {-a[x], a[x]};
		while(v[x].size() && cur.second < 0) {
			pair<int, int> tmp = v[x].top();
			v[x].pop();
			cur.first = max(cur.first, tmp.first - cur.second);
			cur.second += tmp.second;
		}
		if(cur.second >= 0) {
			while(v[x].size() && v[x].top().first <= cur.first) {
				cur.second += v[x].top().second;
				v[x].pop();
			}
			v[x].push(cur);
		}
	}
}
 
int32_t main() 
{
	ios_base::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
	int n, s, x, ans = 0;
	cin >> n >> s;
	a[0] = s;
	for(int i = 1; i <= n; i++) {
		cin >> a[i] >> x;
		adj[x].push_back(i);
	}
	dfs(0);
	while(v[0].size() && v[0].top().first <= ans) {
		ans += v[0].top().second;
		v[0].pop();
	}
	cout << ans-s;
}

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