Cod sursa(job #3252721)

Utilizator VelcqMihnea Velcea Velcq Data 30 octombrie 2024 19:36:47
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.86 kb
#include <iostream>
#include <vector>
#include <queue>
#include <fstream>

using namespace std;

int main() {
    ifstream fin("bfs.in");
    ofstream fout("bfs.out");

    int N, M, S;
    fin >> N >> M >> S;

    vector<vector<int>> adj(N + 1);
    for (int i = 0; i < M; i++) {
        int x, y;
        fin >> x >> y;
        adj[x].push_back(y);
    }

    vector<int> dist(N + 1, -1);
    dist[S] = 0;

    queue<int> q;
    q.push(S);

    while (!q.empty()) {
        int node = q.front();
        q.pop();

        for (int neighbor : adj[node]) {
            if (dist[neighbor] == -1) {
                dist[neighbor] = dist[node] + 1;
                q.push(neighbor);
            }
        }
    }

    for (int i = 1; i <= N; i++) {
        fout << dist[i] << " ";
    }

    fin.close();
    fout.close();
    return 0;
}