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Cod sursa(job #604442)
#include <iostream>
#include <vector>
#include <queue>
#define NMax 100005
using namespace std;
vector <int> G[NMax];
int N, L[NMax], S;
bool Viz[NMax];
queue <int> Q;
void Read ()
{
freopen ("bfs.in", "r", stdin);
int M;
scanf ("%d %d %d", &N, &M, &S);
for (; M>0; --M)
{
int X, Y;
scanf ("%d %d", &X, &Y);
G[X].push_back (Y);
}
}
void Print ()
{
freopen ("bfs.out", "w", stdout);
for (int i=1; i<=N; ++i)
{
if (!Viz[i])
{
L[i]=-1;
}
printf ("%d ", L[i]);
}
}
void BFS (int Start)
{
Q.push (Start);
L[Start]=0;
while (!Q.empty ())
{
int X=Q.front ();
Q.pop ();
Viz[X]=true;
for (unsigned v=0; v<G[X].size (); ++v)
{
int V=G[X][v];
if (!Viz[V])
{
Q.push (V);
Viz[V]=true;
L[V]=L[X]+1;
}
}
}
}
int main()
{
Read ();
BFS (S);
Print ();
return 0;
}