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Cod sursa(job #360819)
#include<vector>
#include<stdio.h>
using namespace std;
int n,m,s,a,b,x[100001],viz[100001],d[100001],nrr,nr[100001];
vector <long> v[100001];
int main ()
{
int i,sf,in;
freopen("bfs.in","r",stdin);
freopen("bfs.out","w",stdout);
scanf("%d%d%d",&n,&m,&s);
for(i=1;i<=m;i++)
{
scanf("%d%d",&a,&b);
if(a!=b)
v[a].push_back(b);
}
x[1]=s;
in=1;sf=1;
viz[s]=1;
for(i=1;i<=n;i++)
nr[i]=v[i].size();
while(sf>=in)
{
nrr=nr[x[in]];
for(i=0;i<nrr;i++)
if(viz[v[x[in]][i]]==0)
{
x[++sf]=v[x[in]][i];
viz[v[x[in]][i]]=1;
d[v[x[in]][i]]=d[x[in]]+1;
}
in++;
}
for(i=1;i<=n;i++)
if(d[i]==0 && i!=s)
printf("-1 ");
else
printf("%d ",d[i]);
printf("\n");
return 0;
}