Submission #757520

#	Time	Username	Problem	Language	Result	Execution time	Memory
757520		Desh03	Olympic Bus (JOI20_ho_t4)	C++17	0 / 100	29 ms	1832 KiB

ho_t4

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

const long long INF = 1e18;

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n, m;
    cin >> n >> m;
    vector<vector<long long>> dp(n, vector<long long> (n, INF)), e = dp;
    vector<tuple<int, int, int, int>> edges;
    for (int i = 0; i < n; i++) dp[i][i] = 0;
    for (int i = 0; i < m; i++) {
        int u, v, c, d;
        cin >> u >> v >> c >> d;
        --u, --v;
        if (c < dp[u][v]) e[u][v] = dp[u][v], dp[u][v] = c;
        else if (c < e[u][v]) e[u][v] = c;
    }
    for (int k = 0; k < n; k++)
        for (int i = 0; i < n; i++)
            for (int j = 0; j < n; j++)
                dp[i][j] = min(dp[i][j], dp[i][k] + dp[k][j]);
    long long ans = INF;
    for (auto [u, v, c, d] : edges) {
        ans = min(ans, dp[0][v] + dp[u][n - 1] + dp[n - 1][0] + d);
        ans = min(ans, dp[0][n - 1] + dp[n - 1][v] + dp[u][0] + d);
    }
    cout << (ans == INF ? -1 : ans) << '\n';
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 11
• Subtask 3: 0 / 21
• Subtask 4: 0 / 63