Cod sursa(job #307189)

Utilizator DraStiKDragos Oprica DraStiK Data 23 aprilie 2009 17:33:36
Problema BFS - Parcurgere in latime Scor 40
Compilator cpp Status done
Runda Arhiva educationala Marime 1.04 kb
#include <algorithm>
#define DIM 1000005
using namespace std;
struct nod {int x;
            nod *urm;} *lst[DIM];
struct coada {int nod,cost;} c[DIM];
int viz[DIM];
int n,m,s;
void add (int a,int b)
{
    nod *p=new nod;
    p->x=b;
    p->urm=lst[a];
    lst[a]=p;
}
int bf (int val)
{
    nod *p;
	int in,sf;
	viz[val]=1;
	for (c[in=sf=1].nod=val; in<=sf; )
        if (c[in].nod==s)
            return c[in].cost;
        else
            for (p=lst[c[in++].nod]; p; p=p->urm)
                if (!viz[p->x])
                {
                    viz[p->x]=1;
                    c[++sf].nod=p->x;
					c[sf].cost=c[in-1].cost+1;
                }
    return -1;
}
int main ()
{
    freopen ("bfs.in","r",stdin);
    freopen ("bfs.out","w",stdout);
    int i,x,y;
    scanf ("%d%d%d",&n,&m,&s);
    for (i=1; i<=m; ++i)
    {
        scanf ("%d%d",&x,&y);
		add (y,x);
    }
    for (i=1; i<=n; ++i)
    {
        memset (viz,0,DIM);
        memset (c,0,DIM);
        printf ("%d ",bf (i));
    }
    return 0;
}