Submission #1086859

#	Time	Username	Problem	Language	Result	Execution time	Memory
1086859		IBory	Jobs (BOI24_jobs)	C++17	100 / 100	247 ms	74852 KiB

Main

#include <bits/stdc++.h>
#define pii pair<ll, ll>
typedef long long ll;
using namespace std;
 
const int MAX = 300003;
vector<int> G[MAX];
priority_queue<pii, vector<pii>, greater<pii>> PQ[MAX];
pii S[MAX];
ll P[MAX];
 
void DFS(int cur) {
	for (int next : G[cur]) DFS(next);
 
	auto& [a, b] = S[cur];
	while (!PQ[cur].empty()) {
		auto [c, d] = PQ[cur].top();
		if (b < c) break;
		b += d - c;
		PQ[cur].pop();
	}
	if (!cur) return;
 
	if (a < b) PQ[cur].push(S[cur]);
	else {
		while (!PQ[cur].empty() && (a >= b || PQ[cur].top().first <= a)) {
			auto [c, d] = PQ[cur].top(); PQ[cur].pop();
			if (b <= c) a += c - b, b = d;
			else b += d - c;
		}
		if (a < b) PQ[cur].emplace(a, b);
	}
 
	if (PQ[cur].size() > PQ[P[cur]].size()) swap(PQ[cur], PQ[P[cur]]);
	while (!PQ[cur].empty()) {
		auto [c, d] = PQ[cur].top(); PQ[cur].pop();
		PQ[P[cur]].emplace(c, d);
	}
}
 
int main() {
	ios::sync_with_stdio(0); cin.tie(0);
	ll N, IS;
	cin >> N >> IS;
	S[0] = {0, IS};
 
	for (int i = 1; i <= N; ++i) {
		ll s;
		cin >> s >> P[i];
		G[P[i]].push_back(i);
		if (s < 0) S[i] = {-s, 0};
		else S[i] = {0, s};
	}
 
	DFS(0);
	ll ans = S[0].second - IS;
	cout << ans;
	return 0;
}

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