Cod sursa(job #2168600)

Utilizator BourucLiviuBouruc Petru Liviu BourucLiviu Data 14 martie 2018 11:42:00
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.84 kb
#include <fstream>
#include <vector>
#include <queue>

#define N 100005

using namespace std;

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

int dist[N];
vector <int> G[N];
queue <int> Q;
bool viz[N];

int main()
{
    int n, m, s;
    fin >> n >> m >> s;
    for(int i = 1, x, y; i <= m; ++i)
    {
        fin >> x >> y;
        G[x].push_back(y);
    }
    fin.close();

    Q.push(s); viz[s] = 1;
    while(!Q.empty())
    {
        int nod = Q.front();
        for(auto i : G[nod])
            if(!viz[i])
            {
                viz[i] = 1;
                dist[i] = dist[nod] + 1;
                Q.push(i);
            }
        Q.pop();
    }

    for(int i = 1; i <= n; ++i)
        if(dist[i] == 0 && i != s) fout << "-1 ";
        else fout << dist[i] << " ";
    fout.close();
    return 0;
}