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Submission #757569

# Submission time Handle Problem Language Result Execution time Memory
757569 2023-06-13T10:50:56 Z Desh03 Olympic Bus (JOI20_ho_t4) C++17
0 / 100
 1000 ms 1840 KB 
#include <bits/stdc++.h>
using namespace std;

const long long INF = 1e18;
int n;
vector<vector<pair<int, int>>> g;

void djikstra(int src, vector<long long> &sp) {
    priority_queue<pair<long long, int>, vector<pair<long long, int>>, greater<pair<long long, int>>> pq;
    pq.push({sp[src] = 0, src});
    vector<bool> vis(n);
    while (pq.size()) {
        int u = pq.top().second;
        pq.pop();
        if (vis[u]) continue;
        vis[u] = 1;
        for (auto [v, w] : g[u]) {
            if (sp[u] + w < sp[v])
                sp[v] = sp[u] + w, pq.push({sp[v], v});
        }
    }
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int m;
    cin >> n >> m;
    g.resize(n);
    vector<long long> sp1, sp2;
    vector<tuple<int, int, int, int>> edges;
    for (int i = 0; i < m; i++) {
        int u, v, c, d;
        cin >> u >> v >> c >> d;
        --u, --v;
        g[u].push_back({v, c});
        edges.push_back({u, v, c, d});
    }
    sp1 = sp2 = vector<long long> (n, INF);
    djikstra(0, sp1), djikstra(n - 1, sp2);
    long long ans = min(INF, sp1[n - 1] + sp2[0]);
    for (auto [u, v, c, d] : edges) {
        g[v].push_back({u, c});
        sp1 = sp2 = vector<long long> (n, INF);
        djikstra(0, sp1), djikstra(n - 1, sp2);
        ans = min(ans, sp1[n - 1] + sp2[0] + d);
        g[v].pop_back();
    }
    cout << (ans == INF ? -1 : ans) << '\n';
}

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 33 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 54 ms 352 KB Output is correct
4 Correct 55 ms 352 KB Output is correct
5 Correct 20 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Incorrect 1 ms 212 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1065 ms 1840 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 43 ms 340 KB Output is correct
2 Correct 2 ms 340 KB Output is correct
3 Execution timed out 1059 ms 1740 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #4
0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 33 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 54 ms 352 KB Output is correct
4 Correct 55 ms 352 KB Output is correct
5 Correct 20 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Incorrect 1 ms 212 KB Output isn't correct
8 Halted 0 ms 0 KB -