Submission #1018669

#	Time	Username	Problem	Language	Result	Execution time	Memory
1018669		vjudge1	Autobus (COCI22_autobus)	C++17	70 / 70	206 ms	8532 KiB

Main

#include <bits/stdc++.h>
#define fast cin.tie(0)->sync_with_stdio(0);
#define inf ((int)1e9)
using namespace std;
const int N = 71;
vector <pair<int, int> > adj[N];
vector <vector<vector<int> > > ans(N);

void dijkstra(int st, int K) { 
	// cout << st << ":\n";
	vector <vector<int> > dist(N, vector<int>(N, inf));
	vector <vector<bool> > vis(N, vector<bool>(N));
	dist[st][0] = 0;
	priority_queue <array<int, 3>, vector<array<int,3> >, greater<array<int, 3>> > pq; // {k, -v, node}
	pq.push({0, 0, st});
	while(!pq.empty()) {
		auto [k, v, node] = pq.top();
		pq.pop();
		if(k > K or vis[node][k]) continue;
		// cout << node << " " << dist[node][k] << "\n";
		vis[node][k] = 1;
		for(auto [to, w]:adj[node]) {
			if(dist[to][k + 1] > v + w) {
				pq.push({k + 1, v + w, to});
				dist[to][k + 1] = v + w;
			}
		}
	}
	ans[st] = dist;
};

int32_t main(){
	fast
	int n, m;
	cin >> n >> m;
	vector <vector<int> > temp(n+1, vector<int>(n + 1, inf));
	for(int i = 0; i < m; i++) {
		int a, b, w;
		cin >> a >> b >> w;
		temp[a][b] = min(temp[a][b], w);
	}
	for(int i = 1; i <= n; i++) {
		for(int j = 1; j <= n; j++) {
			if(i == j) temp[i][j] = 0;
			if(temp[i][j] == inf) continue;
			adj[i].push_back({j, temp[i][j]});
		}
	}
	int K, Q;
	cin >> K >> Q;
	K = min(K, n - 1);
	for(int i = 1; i <= n; i++) {
		dijkstra(i, K);
	}
	while(Q--) {
		int a, b;
		cin >> a >> b;
		cout << (ans[a][b][K] == inf ? -1 : ans[a][b][K]) << "\n";
	} 
}

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