@SuppressWarnings("unchecked")
public void ensureCapacity(int minCapacity) {
opcount++;
if (minCapacity > a.length) {
int newCapacity = Math.max(minCapacity, a.length * 2);
final T[] temp = (T[]) new Object[newCapacity];
for (int i = a.length - 1; i >= 0; i--) temp[i] = a[i];
a = temp;
}
}
public ResizingArray(int N) {
this(N, Math.max(N, 4));
}