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Cod sursa(job #880050)
#include <iostream>
#include <fstream>
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
#define Nmax 100005
struct elem{
int inf;
elem *adr;
}*v[Nmax];
int n,m,viz[Nmax],s,dist,d[Nmax];
void citesc()
{
int x,y;
elem *p;
f>>n>>m>>s;
for(int i=1;i<=m;i++)
{
f>>x>>y;
p=new elem;
p->inf=y;
p->adr=v[x];
v[x]=p;
}
}
void bfs(int x){
//cout<<x;
dist++;
for(elem *p=v[x];p!=NULL;p=p->adr){
if(d[p->inf]==0){
if(p->inf==s)
d[s]=0;
else
d[p->inf]=dist;
}
}
for(elem *p=v[x];p!=NULL;p=p->adr){
if(d[p->inf]==dist){
bfs(p->inf);
}
}
}
/*void afis()
{
for(int i=1;i<=n;i++)
{
for(elem *p=v[i];p!=NULL;p=p->adr)
cout<<p->inf<<' ';
cout<<'\n';
}
}*/
void afis(){
for(int i=1;i<=n;i++)
if(d[i]==0 && i!=s)
g<<-1<<" ";
else
g<<d[i]<<" ";
}
int main()
{
citesc();
bfs(s);
afis();
return 0;
}