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Cod sursa(job #640804)
#include <stdio.h>
#include <list>
#include <deque>
using namespace std;
const int DIM = 100005;
int N, M, dst[DIM], viz[DIM], C[DIM], U[DIM], T[DIM*11], V[DIM*11], S, K;
void bfs ()
{
int p = 0, u = 0, n, f;
C[0] = S;
viz[S] = 1;
while (p <= u)
{
n = C[p];
for (int i = n-1; T[i] != 0; i = T[i])
{
f = V[i];
if (viz[f] == 0)
{
C[++u] = f;
viz[f] = 1;
dst[f] = dst[n] + 1;
}
}
p++;
}
}
int main ()
{
freopen ("bfs.in", "r", stdin);
freopen ("bfs.out", "w", stdout);
scanf ("%d%d%d", &N, &M, &S);
for (int i = 1; i <= N; i++)
U[i] = i-1;
K = N;
for (int i = 0, a, b; i < M; i++)
{
scanf ("%d%d", &a, &b);
V[U[a]] = b;
T[U[a]] = K;
U[a] = K++;
}
bfs ();
for (int i = 1; i <= N; i++)
if (dst[i] == 0 && i != S)
printf ("-1 ");
else
printf ("%d ", dst[i]);
return 0;
}