Method up

src/class153/Code04_Bookcase1.java:46–48

(int i)

	public static int n, m;

	public static void up(int i) {
		size[i] = size[left[i]] + size[right[i]] + 1;
	}

	public static int lr(int i) {
		return right[father[i]] == i ? 1 : 0;