Cod sursa(job #3367553)

Utilizator VladPislaruPislaru Vlad Rares VladPislaru Data 8 octombrie 2026 17:19:59
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.95 kb
#include <bits/stdc++.h>

#define INF 2e9
using namespace std;

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

int n, m, source;

vector <vector<int>> adj;
vector <int> dist;

void BFS(int source) {
    queue<int> q;
    q.push(source);
    dist[source] = 0;
    while(!q.empty()) {
        int nod = q.front();
        q.pop();
        for (int i : adj[nod])
            if (dist[i] > dist[nod] + 1) {
                q.push(i);
                dist[i] = dist[nod] + 1;
            }
    }
    for(int i = 1; i <= n; i++)
        if (dist[i] != INF)
            fout << dist[i] << " ";
        else fout << "-1 ";
    fout << "\n";
}

int main()
{
    fin >> n >> m >> source;
    adj.resize(n + 5);
    dist.resize(n + 5);
    for (int i = 1; i <= n; i++)
        dist[i]=INF;
    for (int i = 1; i <= m; i++) {
        int x, y;
        fin >> x >> y;
        adj[x].push_back(y);
    }
    BFS(source);
    return 0;
}