Cod sursa(job #2147379)

Utilizator george.ursachiUrsachi George george.ursachi Data 28 februarie 2018 18:14:39
Problema BFS - Parcurgere in latime Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.93 kb
#include <fstream>
#include <vector>
#include <queue>
using namespace std;

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

vector <int> v[100005];
queue <int> c;
int n,m,x,y,s,cost[100005];
bool viz[100005];

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

    for(int i=1;i<=n;i++)
        cost[i]=-1;

    cost[s]=0;
    c.push(s);

    int nod,nod_nou;
    while(c.size())
    {
        nod=c.front();
        viz[nod]=1;
        for(vector<int>::iterator it=v[nod].begin();it!=v[nod].end();it++)
        {
            nod_nou=*it;
            if(!viz[nod_nou] && cost[nod]==-1)
            {
                c.push(nod_nou);
                cost[nod_nou]=cost[nod]+1;
            }
        }
        c.pop();
    }

    for(int i=1;i<=n;i++)
        fout<<cost[i]<<' ';
    fin.close();
    fout.close();
    return 0;
}