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Cod sursa(job #367917)
# include <fstream>
# include <iostream>
# include <cstdlib>
using namespace std;
# define MAX 100001
struct nod {
int info;
nod *next;};
int n, s, d[MAX];
nod *a[MAX];
void read ()
{
ifstream fin ("bfs.in");
int m;
fin>>n>>m>>s;
for (int i=1;i<=n;i++)
{
a[i]=NULL;
d[i]=-1;
}
for (;m;m--)
{
int i, j;
fin>>i>>j;
nod *p=new nod;
p->info=j;
p->next=a[i];
a[i]=p;
}
}
void bfs ()
{
nod *st, *dr;
int k;
st=dr=new nod;
dr->info=s;
dr->next=NULL;
d[s]=0;
while (st!=NULL)
{
k=st->info;
for (nod*p=a[k];p;p=p->next)
if (d[p->info]==-1)
{
nod *q=new nod;
q->info=p->info;
p->next=NULL;
dr->next=p;
dr=p;
d[p->info]=d[k]+1;
}
nod *t=st;
st=st->next;
delete t;
}
}
void write ()
{
ofstream fout ("bfs.out");
for (int i=1;i<=n;i++)
fout<<d[i]<<" ";
}
int main ()
{
read ();
bfs ();
write ();
return 0;
}