随机打印0-100的全部数字并且不可重复，时间复杂度为O(n)

import java.util.*;

public class Test {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		Random a = new Random();
		LinkedHashSet b = new LinkedHashSet<>();
		int sum = 0;
		while (b.size() < 100) {
			int c = a.nextInt(101);// [0,101)
			b.add(c);
			sum += 1;
		}
		System.out.println(sum);// O(n) 打印了多少次
		Iterator iterator = b.iterator();
		while (iterator.hasNext()) {
			System.out.println(iterator.next());
		}

	}

}