Cod sursa(job #276870)

Utilizator silaghi_raulSzilagyi Raul Razvan silaghi_raul Data 11 martie 2009 13:02:07
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.95 kb
#include<stdio.h>
int N,M,S,viz[100000];
int st,sf,niv;
int n[100000];
int coada[100000];
typedef struct Nod
{
  int k;
  struct Nod *urm;
}*pNod;
pNod v[100001];
void add(pNod &dest,int x)
{
  pNod p;
  p = new Nod;
  p->k=x;
  p->urm=dest;
  dest=p;
}
void citire()
{
  int i,x,y;
  FILE *in = fopen("bfs.in","rt");
  fscanf(in,"%d %d %d",&N,&M,&S);
  for(i=1;i<=N;i++) n[i]=-1;
  for(i=1;i<=M;i++)
  {
    fscanf(in,"%d %d",&x,&y);
    add(v[x],y);
  }
  fclose(in);
}
void bf(int S)
{
  pNod p;
  st=sf=1;
  coada[st]=S;
  viz[S]=1;
  n[S]=0;
  sf++;
  while(st<sf)
  {
    for(p=v[coada[st]];p!=NULL;p=p->urm)
     if(!viz[p->k])
     {
       viz[p->k]=1;
       coada[sf]=p->k;
       sf++;
       n[p->k]=n[coada[st]]+1;
     }
     st++;
  }
}
int main()
{
  int i,nr=0;
  citire();
  bf(S);
  FILE *out=fopen("bfs.out","wt");
  for(i=1;i<=N;i++)
  fprintf(out,"%d ",n[i]);
  fclose(out);
  return 0;
}