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Cod sursa(job #703117)
#include <cstdio>
#include <vector>
#include <queue>
using namespace std;
#define maxN 100005
#define PB push_back
int N , M , S , cost[maxN];
bool viz[maxN];
vector <int> lista[maxN];
queue <int> Q;
void bfs (int x)
{
Q.push (x);
viz[x] = true;
while (!Q.empty ())
{
int nod = Q.front();
Q.pop ();
for (unsigned int i = 0 ; i < lista[nod].size () ; ++i)
{
int nodcur = lista[nod][i];
if (viz[nodcur]) continue;
cost[nodcur] = cost[nod] + 1;
Q.push (nodcur);
viz[nodcur] = true;
}
}
}
int main ()
{
freopen ("bfs.in" , "r" , stdin);
freopen ("bfs.out" , "w" , stdout);
scanf ("%d %d %d" , &N , &M , &S);
int a , b;
for (int i = 1 ; i <= M ; ++i)
{
scanf ("%d %d" , &a , &b);
lista[a].PB (b);
}
for (int i = 1 ; i <= N ; ++i)
cost[i] = -1;
cost[S] = 0;
bfs (S);
for (int i = 1 ; i <= N ; ++i)
printf ("%d " , cost[i]);
return 0;
}