Submission #825612

#	Time	Username	Problem	Language	Result	Execution time	Memory
825612		t6twotwo	Two Currencies (JOI23_currencies)	C++17	10 / 100	5056 ms	14660 KiB

currencies

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int N, M, Q;
    cin >> N >> M >> Q;
    vector<pair<int, int>> edges(N - 1);
    vector<vector<pair<int, int>>> adj(N);
    for (int i = 0; i < N - 1; i++) {
        int x, y;
        cin >> x >> y;
        x--, y--;
        edges[i] = {x, y};
        adj[x].emplace_back(y, i);
        adj[y].emplace_back(x, i);
    }
    vector<vector<int>> c(N - 1);
    for (int i = 0; i < M; i++) {
        int P, C;
        cin >> P >> C;
        c[P - 1].push_back(C);
    }
    while (Q--) {
        int S, T, X; ll Y;
        cin >> S >> T >> X >> Y;
        S--, T--;
        vector<int> p(N, -1);
        queue<int> q;
        p[S] = S;
        q.push(S);
        while (!q.empty()) {
            int x = q.front();
            q.pop();
            for (auto [y, z] : adj[x]) {
                if (p[y] == -1) {
                    p[y] = z;
                    q.push(y);
                }
            }
        }
        priority_queue<int, vector<int>, greater<int>> pq;
        while (T != S) {
            for (int v : c[p[T]]) {
                pq.push(v);
            }
            auto [x, y] = edges[p[T]];
            T ^= x ^ y;
        }
        while (!pq.empty() && pq.top() <= Y) {
            Y -= pq.top();
            pq.pop();
        }
        X -= pq.size();
        X = max(X, -1);
        cout << X << "\n";
    }
    return 6/22;
}

• Subtask 1: 10 / 10
• Subtask 2: 0 / 28
• Subtask 3: 0 / 30
• Subtask 4: 0 / 32