Submission #1086603

#	Time	Username	Problem	Language	Result	Execution time	Memory
1086603		IBory	Jobs (BOI24_jobs)	C++17	0 / 100	268 ms	74576 KiB

Main

#include <bits/stdc++.h>
#define pii pair<ll, ll>
typedef long long ll;
using namespace std;

const int MAX = 300003;
set<int> G[MAX];
priority_queue<pii, vector<pii>, greater<pii>> PQ[MAX];
pii S[MAX], off[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();
		c += off[cur].first; d += off[cur].second;
		if (b < c) break;
		if (c < d) b = b + d - c;
		PQ[cur].pop();
	}
	if (!cur) return;

	if (a < b) PQ[P[cur]].emplace(a - off[P[cur]].first, b - off[P[cur]].second);

	off[cur].first += a - b;
	off[cur].second += min(0LL, a - b);
	if (PQ[cur].size() > PQ[P[cur]].size()) {
		swap(off[cur], off[P[cur]]);
		swap(PQ[cur], PQ[P[cur]]);
	}

	while (!PQ[cur].empty()) {
		auto [c, d] = PQ[cur].top(); PQ[cur].pop();
		c = c + off[cur].first; d += off[cur].second;
		PQ[P[cur]].emplace(c - off[P[cur]].first, d - off[P[cur]].second);
	}

	// cout << "Current " << cur << ": " << a << ' ' << b << '\n';
}

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]].insert(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: 0 / 11
• Subtask 2: 0 / 14
• Subtask 3: 0 / 15
• Subtask 4: 0 / 29
• Subtask 5: 0 / 31