Cod sursa(job #1997076)

Utilizator roxana.aeleneiAelenei Roxana roxana.aelenei Data 3 iulie 2017 12:36:16
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.81 kb
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream in("bfs.in");
ofstream out("bfs.out");
vector <int> G[100005];
queue <int> q;
int viz[100005];
void bfs(int u)
{
    int v,l;
    viz[u]=0;
    q.push(u);
    while(!q.empty())
    {
        u=q.front();
        q.pop();
        l=G[u].size();
        for(int i=0; i<l; i++)
        {
            v=G[u][i];
            if(viz[v]==-1)
            {
                viz[v]=viz[u]+1;
                q.push(v);
            }
        }
    }
}
int main()
{
    int n,m,s,x,y;
    in>>n>>m>>s;
    for(int i=1; i<=m; i++)
    {
        in>>x>>y;
        G[x].push_back(y);
    }
    for(int i=1; i<=n; i++)
        viz[i]=-1;
    bfs(s);
    for(int i=1; i<=n; i++)
        out<<viz[i]<<" ";
    return 0;
}