Method down

src/class201/Code05_OTOCI1.java:57–63

(int x)

	}

	public static void down(int x) {
		if (rev[x]) {
			reverse(ls[x]);
			reverse(rs[x]);
			rev[x] = false;
		}
	}

	public static void rotate(int x) {
		int f = fa[x], g = fa[f];