Submission #472181

#	Time	Username	Problem	Language	Result	Execution time	Memory
472181		elgamalsalman	Toll (BOI17_toll)	C++14	0 / 100	3071 ms	6400 KiB

toll

#include <bits/stdc++.h>

using namespace std;

#define fi first
#define se second

typedef long long ll;
typedef pair<int, int> ii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<vii> vvii;

int k, n, m, o;
vvii  adj;

ll getToll(int u, int v) {
  //cerr << "// getToll(" << u << ", " << v << ")\n";
  if (u == v) return 0;
  if (u/5 >= v/5) return -1;

  ll minToll = -1;
  for (ii edge : adj[u]) {
    ll currToll = getToll(edge.fi, v);
    if (currToll == -1) continue;
    currToll += edge.se;
    if (minToll == -1 || currToll < minToll) minToll = currToll;
  }

  return minToll;
}

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

  cin >> k >> n >> m >> o;
  adj.assign(n + 20, vii());
  for (int i = 0; i < m; i++) {
    int a, b, t;
    cin >> a >> b >> t;
    adj[a].push_back({b, t});
  }
  
  for (int i = 0; i < o; i++) {
    int a, b;
    cin >> a >> b;
    if (a > b) swap(a, b);
    cout << getToll(a, b) << '\n';
  }
}

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