Submission #599532

#	Time	Username	Problem	Language	Result	Execution time	Memory
599532		pedroslrey	Toll (BOI17_toll)	C++17	10 / 100	55 ms	6712 KiB

toll

#include <bits/stdc++.h>

using namespace std;

const int MAXN = 5e4 + 10;

vector<pair<int, int>> graph[MAXN];
int dist[MAXN];
bool marc[MAXN];

void dijkstra(int n) {
    for (int i = 1; i < n; ++i)
        dist[i] = 1e9;

    set<pair<int, int>> s;
    s.emplace(0, 0);

    while (!s.empty()) {
        int u = s.begin()->second; s.erase(s.begin());

        if (marc[u]) continue;
        marc[u] = true;

        for (auto [v, c]: graph[u]) {
            int d = dist[u] + c;
            if (dist[v] > d) {
                dist[v] = d;
                s.emplace(d, v);
            }
        }
    }
}

int main() {
    ios_base::sync_with_stdio(false); cin.tie(NULL);
    int n, q, m, k;
    cin >> k >> n >> m >> q;

    for (int i = 0; i < m; ++i) {
        int u, v, t;
        cin >> u >> v >> t;

        graph[u].emplace_back(v, t);
    }

    dijkstra(n);

    for (int i = 0; i < q; ++i) {
        int a, b;
        cin >> a >> b;

        if (marc[b]) cout << dist[b] << "\n";
        else cout << "-1\n";
    }
}

• Subtask 1: 0 / 7
• Subtask 2: 10 / 10
• Subtask 3: 0 / 8
• Subtask 4: 0 / 31
• Subtask 5: 0 / 44