Submission #641266

#	Time	Username	Problem	Language	Result	Execution time	Memory
641266		lto5	Autobus (COCI22_autobus)	C++14	70 / 70	128 ms	9932 KiB

Main

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

long long dist[75][75];
long long f[75][75][75];
int n, m;
int lim, q;

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);

  cin >> n >> m;

  memset(dist, 0x3f, sizeof(dist));
  memset(f, 0x3f, sizeof(f));

  const long long INF = dist[0][0];

  for (int i = 0; i <= n; i++)
    dist[i][i] = 0,
    f[1][i][i] = 0;

  while (m--) {
    int u, v, w;
    cin >> u >> v >> w;
    dist[u][v] = min(dist[u][v], 1ll * w);
    f[1][u][v] = dist[u][v];
  }

  cin >> lim >> q;

  lim = min(lim, n-1);

  for (int t = 2; t <= lim; t++) {
    for (int i = 1; i <= n; i++) {
      for (int j = 1; j <= n; j++) {
        for (int k = 1; k <= n; k++)
          f[t][i][j] = min(f[t][i][j], f[t - 1][i][k] + dist[k][j]);
      }
    }
  }

  while (q--) {
    int u, v;
    cin >> u >> v;
    long long ans = INF;
    for (int t = 0; t <= lim; t++)
      ans = min(ans, f[t][u][v]);
    if (ans == INF)
      cout << -1 << "\n";
    else cout << ans << "\n";
  }

  return 0;
}

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