Cod sursa(job #2506259)

Utilizator emanuel27iIonescu Emanuel emanuel27i Data 7 decembrie 2019 19:05:34
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.76 kb
#include <fstream>
#include <queue>
#include <vector>
using namespace std;

ifstream cin("bfs.in");
ofstream cout("bfs.out");

queue <int> q;
vector <int> g[100002];
int viz[100002];

int main()
{
    int n,a,b,m,k;
    cin>>n>>m>>k;
    for(int i=1;i<=m;i++)
    {
        cin>>a>>b;
        g[a].push_back(b);
    }
    for(int i=1;i<=n;i++)
        viz[i]=-1;
    q.push(k);
    viz[k]=0;
    while(!q.empty())
    {
        int x=q.front();
        q.pop();
        for(int i=0;i<g[x].size();++i)
        {
            int y=g[x][i];
            if(viz[y]==-1)
            {
                viz[y]=viz[x]+1;
                q.push(y);
            }
        }
    }
    for(int i=1;i<=n;++i)
        cout<<viz[i]<<' ';
    return 0;
}