Cod sursa(job #2695243)

Utilizator stefan.ghenescu2005@gmail.comStefan Ghenescu [email protected] Data 12 ianuarie 2021 11:03:29
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.93 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 v[100005];

void bfs(int n, int m, int nod_plecare)
{
    q.push(nod_plecare);
    v[nod_plecare]=0;
    while(!q.empty())
    {
        int elem_curent=q.front();
        q.pop();
        for(int i=0;i<G[elem_curent].size();i++)
        {
            int vecin=G[elem_curent][i];
            if(v[vecin]==-1)
            {
                q.push(vecin);
                v[vecin]=v[elem_curent]+1;
            }
        }
    }
}

int main()
{
    int n,m,nod_plecare,x,y;
    in>>n>>m>>nod_plecare;
    for(int i=0;i<m;i++)
    {
        in>>x>>y;
        G[x].push_back(y);
    }
    for(int i=1;i<=n;i++)
    {
        v[i]=-1;
    }
    bfs(n,m,nod_plecare);
    for(int i=1;i<=n;i++)
    {
        out<<v[i]<<' ';
    }



}