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Cod sursa(job #240981)
#include <stdio.h>
#include <vector>
#define pb push_back
using namespace std;
vector<long> a[100001];
long j,i,l,n,m,x,y,s,v[100001],niv[100001];
int main()
{
freopen ("bfs.in","r",stdin);
freopen ("bfs.out","w",stdout);
scanf("%ld %ld %ld\n",&n,&m,&s);
for (i=1;i<=m;++i){
scanf("%ld %ld",&x,&y);
a[x].pb(y);
}
v[++l]=s;niv[s]=0;
for (i=0;i<a[s].size();++i)
if (niv[a[s][i]]==0&&a[s][i]!=s)
v[++l]=a[s][i],
niv[a[s][i]]=niv[s]+1;
i=1;
while (i<=l){
i++;
for (j=0;j<a[v[i]].size();++j)
if(niv[a[v[i]][j]]==0&&a[v[i]][j]!=s){
v[++l]=a[v[i]][j];
niv[a[v[i]][j]]=niv[v[i]]+1;
}
}
for(i=1;i<=n;++i)
if(niv[i]==0&&i!=s)niv[i]=-1;
for(i=1;i<=n;++i)
printf("%ld ",niv[i]);
return 0;
}