Cod sursa(job #2509516)

Utilizator andaraluca2001Anda Epure andaraluca2001 Data 14 decembrie 2019 12:15:44
Problema BFS - Parcurgere in latime Scor 60
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.77 kb
#include <fstream>

using namespace std;
const int N=100009;
int q[N],d[N],lst[N],vf[N],n,m,start,L,D,nr,urm[N];

ifstream in("bfs.in");
ofstream out("bfs.out");
void adauga(int x, int y)

{

    vf[++nr]=y;

    urm[nr]=lst[x];

    lst[x]=nr;

}


void bfs(int x0)
{
   int st,dr;
   for(int i=1;i<=n;i++) d[i]=-1;

   st=0;
   dr=-1;

   q[++dr]=x0;
   d[x0]=0;

   while(st<=dr)
   {
      int x=q[st++];
      for(int p=lst[x];p!=0;p=urm[p])
      {
          int y=vf[p];
          if(d[y]==-1)
          {
             q[++dr]=y;
             d[y]=1+d[x];


          }


      }

   }



}
int main()
{
    in>>n>>m>>start;

    for(int i=1;i<=m;i++)
    {
        in>>L>>D;
        adauga(L,D);

    }

    bfs(start);

    for(int i=1;i<=n;i++) out<<d[i]<<" ";

    return 0;
}