Submission #1309877

#	Time	Username	Problem	Language	Result	Execution time	Memory
1309877		harryleee	Jobs (BOI24_jobs)	C++20	11 / 100	176 ms	53576 KiB

Main

#include<bits/stdc++.h>
using namespace std;

const int maxn = 3e5 + 5;
int n;
long long init_money, res;
pair<long long, int> a[maxn];
vector<int> adj[maxn];

struct sct{
    bool operator ()(const pair<long long, long long>& a, const pair<long long, long long>& b) const {
        return a.first > b.first || (a.first == b.first && a.second > b.second);
    }
};
multiset<pair<long long, long long>, sct> ms[maxn];


inline void DFS(int u) {
    for (int v : adj[u]) {
        DFS(v);
        
        if (ms[v].size() > ms[u].size()) {
            swap(ms[u], ms[v]); 
        }
        
        for (auto &x : ms[v]) {
            ms[u].insert(x);
        }
        ms[v].clear();
    }

    pair<long long, long long> cur = {min(0LL, a[u].first), a[u].first};
    while (!ms[u].empty() && (cur.second <= 0 || cur.first >= (*(ms[u].begin())).first)) {
        auto it = ms[u].begin();
        pair<long long, long long> best = *it;
        ms[u].erase(it);

        cur.first = min(cur.first, cur.second + best.first);
        cur.second += best.second;
    }

    if (cur.second > 0) {
        ms[u].insert(cur);
    }
    return;
}

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

    cin >> n >> init_money;
    for (int i = 1; i <= n; ++i) {
        cin >> a[i].first >> a[i].second;
        adj[a[i].second].push_back(i);
    }

    DFS(0);

    for (auto it = ms[0].begin(); it != ms[0].end(); ++it) {
        auto [cost, earn] = *it;
        if (init_money + res + cost < 0) {
            break; 
        }
        res += earn;
    }

    cout << res;

    return 0;
}

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