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Cod sursa(job #839124)
#include <fstream>
using namespace std;
ifstream fin ("bfs.in");
ofstream fout("bfs.out");
struct nod {
nod *next;
int inf;
};
int main()
{
nod *graf[100500],*pcoada,*ucoada;
nod *x,*y;
int i,m,n,s,a,b,k;
int rez[100600],viz[100300];
fin>>n>>m>>s;
for(i=1;i<=n;i++)
{
rez[i]=0;
viz[i]=0;
graf[i]=new nod();
graf[i]->next=NULL;
}
for ( i=1;i<=m;i++)
{
fin>>a>>b;
x=new nod();
x->inf=b;
x->next=graf[a];
graf[a]=x;
}
x=new nod();
x=graf[s];
viz[s]=1;
pcoada=ucoada=x;
viz[x->inf]=1;
rez[x->inf]++;
x=x->next;
while (x->next)
{
//se poate sa fie mai multe muchii intre a,b. trebe verificat
if (viz[x->inf]==0)
{
viz[x->inf]=1;
rez[x->inf]++;
y=new nod();
ucoada->next=y;
y->inf=x->inf;
ucoada=y;
x=x->next;
}
else
x=x->next;
}
while ( pcoada )
{
k=pcoada->inf;
//rez[k]++;
x=new nod();
x=graf[k];
while (x)
{
if(viz[x->inf]==0)
{
viz[x->inf]=1;
y=new nod();
ucoada->next=y;
y->inf=x->inf;
ucoada=y;
rez[y->inf]=rez[k]+1;
x=x->next;
}
else
{
x=x->next;
}
}
pcoada=pcoada->next;
}
for(i=1;i<=n;i++)
if(viz[i])
{
fout<<rez[i]<<" ";
}
else
fout<<"-1 ";
fin.close();
fout.close();
return 0;
}