Cod sursa(job #1810922)

Utilizator paulstepanovStepanov Paul paulstepanov Data 20 noiembrie 2016 17:58:13
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.06 kb
#include <fstream>
#include <vector>
#define NMax 100005
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
vector <int> G[NMax];
int N, M, X, Y,Use[NMax],Sol,Start,D[NMax],C[NMax],k;
void Read()
{
    fin>>N>>M>>Start;
    for(int i=1; i<=M; i++)
    {
        fin>>X>>Y;
        G[X].push_back(Y);
    }
}

void BFS(int nod)
{
    Use[Start]=1;
    C[1]=Start;
    k=1;
    for(int i=1;i<=N;i++)
        D[i]=-1;
    D[Start]=0;
    for(int i=1;i<=k;i++)
        {
            int nod=C[i];
            for(unsigned int j=0;j<G[nod].size();j++)
                {
                    int vecin=G[nod][j];
                    if(!Use[vecin])
                        {
                            C[++k]=vecin;
                            Use[vecin]=1;
                            D[vecin]=D[nod]+1;
                        }
                }
        }
}

void Print()
{
    for(int i=1;i<=N;i++)
        fout<<D[i]<<" ";
    fout<<'\n';

}
int main()
{
    Read();
    BFS(Start);
    Print();
    return 0;
}