Submission #534829

#	Time	Username	Problem	Language	Result	Execution time	Memory
534829		phathnv	Autobus (COCI22_autobus)	C++11	70 / 70	155 ms	8116 KiB

Main

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

const int N = 75;

int n, m, dp[N][N][N];

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> n >> m;
    for (int i = 1; i <= n; ++i) {
        for (int u = 1; u <= n; ++u) {
            for (int v = 1; v <= n; ++v) {
                dp[i][u][v] = (u != v? 1e9 : 0);
            }
        }
    }
    for (int i = 0; i < m; ++i) {
        int u, v, c;
        cin >> u >> v >> c;
        dp[1][u][v] = min(dp[1][u][v], c);
    }
    for (int i = 2; i <= n; ++i) {
        for (int u = 1; u <= n; ++u) {
            for (int v = 1; v <= n; ++v) {
                dp[i][u][v] = dp[i - 1][u][v];
            }
        }
        for (int u = 1; u <= n; ++u) {
            for (int v = 1; v <= n; ++v) {
                for (int k = 1; k <= n; ++k) {
                    dp[i][u][v] = min(dp[i][u][v], dp[i - 1][u][k] + dp[1][k][v]);
                }
            }
        }
    }
    int k, q;
    cin >> k >> q;
    k = min(k, n);
    for (int i = 0; i < q; ++i) {
        int u, v;
        cin >> u >> v;
        cout << (dp[k][u][v] == 1e9? -1 : dp[k][u][v]) << '\n';
    }
    return 0;
}

• Subtask 1: 15 / 15
• Subtask 2: 15 / 15
• Subtask 3: 25 / 25
• Subtask 4: 15 / 15