Заполнить карточку: найдите две ошибки.
include <iostream.h>
static const int N = 10000;
int i, p, q, id[N];
for ( i = 0; i < N; i++) id[i] = i;
while (cin >> p >> q) {
int t = id[p];
if (t == id[q]) continue;
for ( i = 0; i < N; i++)
if (id[i] == t) id[i] = id[q];

cout << " " << p << " " << q << endl;
}
}