Method lr

src/class153/Code04_Bookcase1.java:50–52

(int i)

	}

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

	public static void rotate(int i) {
		int f = father[i], g = father[f], soni = lr(i), sonf = lr(f);