Method reverse

src/class201/Code07_Network1.java:58–65

(int x)

	}

	public static void reverse(int x) {
		if (x != 0) {
			int tmp = ls[x];
			ls[x] = rs[x];
			rs[x] = tmp;
			rev[x] = !rev[x];
		}
	}

	public static void down(int x) {
		if (rev[x]) {