Cod sursa(job #1983899)

Utilizator patcasrarespatcas rares danut patcasrares Data 22 mai 2017 19:15:51
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.77 kb
#include<fstream>
#include<vector>
#include<queue>
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
vector<int >v[100005];
int n,m,s,x,y;
queue<int >q;
int d[100005];
void ve()
{
    int nod,nr;
    q.push(s);
    while(!q.empty())
    {
        nod=q.front();
        nr=d[nod];
        q.pop();
        for(int i=0;i<v[nod].size();i++)
            if(d[v[nod][i]]==0)
            {
                q.push(v[nod][i]);
                d[v[nod][i]]=nr+1;
            }
    }
}
int main()
{
    fin>>n>>m>>s;
    for(int i=1;i<=m;i++)
    {
        fin>>x>>y;
        v[x].push_back(y);
    }
    ve();
    d[s]=0;
    for(int i=1;i<=n;i++)
        if(d[i]==0&&i!=s)
            fout<<-1<<' ';
        else fout<<d[i]<<' ';
}