Cod sursa(job #2397991)

Utilizator StasBrega Stanislav Stas Data 4 aprilie 2019 22:53:37
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.01 kb
#include <bits/stdc++.h>

using namespace std;

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

queue <int> coada;

vector <int> a[100005];

const int oo=100010;
int N,M,S,Min[100005];

void citeste()
{
    fin >> N >> M >> S;
    for(int i=1;i<=M;i++)
    {
        int x,y;
        fin >> x >> y;
        a[x].push_back(y);
    }
    for(int i=1;i<=N;i++)
        Min[i]=oo;
    coada.push(S);
    Min[S]=0;
}
void bfs()
{
    while(!coada.empty())
    {
        int nod=coada.front();
        coada.pop();
        for(int i=0;i<a[nod].size();i++)
        {
            int vecin=a[nod][i];
            if(Min[nod]+1<Min[vecin])
            {
                coada.push(vecin);
                Min[vecin]=Min[nod]+1;
            }
        }
    }
}
void afiseaza()
{
    for(int i=1;i<=N;i++)
        if(Min[i]==oo)
            fout << "-1 ";
        else
            fout << Min[i] << " ";
}
int main()
{

    citeste();
    bfs();
    afiseaza();

    return 0;

}