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Cod sursa(job #505820)
#include <iostream>
#include <stdio.h>
#define LGMAX 100001
using namespace std;
int n,m,s;
struct nod{
int inf;
nod *urm;
};
nod *g[100001];
void add(int x,int y)
{
nod *aux=new nod;
aux->inf=y;
aux->urm=g[x];
g[x]=aux;
}
void citire()
{
freopen ("bfs.in","r",stdin);
scanf ("%d%d%d",&n,&m,&s);
int x,y;
for (int i=0;i<m;i++)
{
scanf ("%d%d",&x,&y);
add(x,y);
}
}
int st[LGMAX],viz[LGMAX],sf,lg[LGMAX];
void bfs(int x)
{
viz[x]=1;lg[x]=0;
st[0]=x;
sf=1;
for (int i=0;i<sf;i++)
for (nod *p=g[st[i]];p;p=p->urm)
if (!viz[p->inf])
{
viz[p->inf]=1;
st[sf++]=p->inf;
lg[p->inf]=lg[st[i]]+1;
}
}
void afis()
{
freopen ("bfs.out","w",stdout);
citire();
bfs(s);
for (int i=1;i<=n;i++)
{
if (!lg[i] && i!=s)
lg[i]=-1;
printf ("%d ",lg[i]);
}
}
int main()
{
afis();
return 0;
}