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Cod sursa(job #525837)
#include <algorithm>
#include <vector>
#include <queue>
using namespace std;
#define pb push_back
#define DIM 100005
vector <int> g[DIM];
queue <int> q;
int dst[DIM];
int n,m,s;
void read ()
{
int i,x,y;
scanf ("%d%d%d",&n,&m,&s);
for (i=1; i<=m; ++i)
{
scanf ("%d%d",&x,&y);
g[x].pb (y);
}
}
void solve ()
{
vector <int> :: iterator it;
int nod;
memset (dst,-1,sizeof (dst));
dst[s]=0;
for (q.push (s); !q.empty (); q.pop ())
{
nod=q.front ();
for (it=g[nod].begin (); it!=g[nod].end (); ++it)
if (dst[*it]<0)
{
dst[*it]=dst[nod]+1;
q.push (*it);
}
}
}
void print ()
{
int i;
for (i=1; i<=n; ++i)
printf ("%d ",dst[i]);
}
int main ()
{
freopen ("bfs.in","r",stdin);
freopen ("bfs.out","w",stdout);
read ();
solve ();
print ();
return 0;
}