Method random

src/class129/Code04_FindNear.java:122–131

(int v)

	// 随机生成arr[1...n]确保没有重复数值
	// 为了测试
	public static void random(int v) {
		HashSet<Integer> set = new HashSet<>();
		for (int i = 1, cur; i <= n; i++) {
			do {
				cur = (int) (Math.random() * v * 2) - v;
			} while (set.contains(cur));
			set.add(cur);
			arr[i] = cur;
		}
	}

	// 如下四个数组用来做备份
	public static int[] a = new int[MAXN];