[简单] 705. 设计哈希集合

https://leetcode-cn.com/problems/design-hashset/

 

 无脑操作：

class MyHashSet {

    private List<Integer> a = new ArrayList<>();

    public MyHashSet() {

    }

    public void add(int key) {
        if(a.indexOf(key) < 0) {
            a.add(key);
        }
    }

    public void remove(int key) {
        if(a.indexOf(key) >= 0) {
            a.remove(Integer.valueOf(key));
        }
    }

    public boolean contains(int key) {
        return a.indexOf(key) >= 0;
    }
}