Cod sursa(job #905607)

Utilizator crudu_denisDenis Crudu crudu_denis Data 5 martie 2013 22:56:41
Problema BFS - Parcurgere in latime Scor 50
Compilator cpp Status done
Runda Arhiva educationala Marime 0.83 kb
#include<fstream>
using namespace std;
int n,m,s,a[2000][2000],v[2000],sol[2000],d[2000];
void citire()
{
    ifstream fin("bfs.in");
    fin>>n>>m>>s;
    int x,y;
    for(;m;m--)
     {
         fin>>x>>y;
         a[x][y]=1;
     }


}
void bfs(int x)
{
    v[x]=1;
    sol[1]=x;
    d[x]=0;
   int st=1,dr=1;
   while(st<=dr)
   {
       for(int i=1;i<=n;i++)

           if(a[sol[st]][i]&&!v[i])
           {
               sol[++dr]=i;
               v[i]=1;
               d[i]=d[sol[st]]+1;
           }

       st++;
   }

}
void afisare()
{
    ofstream fout("bfs.out");
    for(int i=1;i<=n;i++)
    {
        if(i!=s&&d[i]==0)
            fout<<"-1 ";
        else
            fout<<d[i]<<" ";
    }


}
int main()
{

    citire();
    bfs(s);
    afisare();
    return 0;
}