設計一個哈希類。數組
須要有add添加元素函數,contains判斷元素存在的函數,remove移除元素函數。函數
這真的沒什麼好說的了…我把要存的值做爲數組的鍵存儲。this
class MyHashSet { protected $values = []; /** * Initialize your data structure here. */ function __construct() { } /** * @param Integer $key * @return NULL */ function add($key) { $this->values[$key] = true; } /** * @param Integer $key * @return NULL */ function remove($key) { if(isset($this->values[$key])){ unset($this->values[$key]); } } /** * Returns true if this set contains the specified element * @param Integer $key * @return Boolean */ function contains($key) { return isset($this->values[$key]); } } /** * Your MyHashSet object will be instantiated and called as such: * $obj = MyHashSet(); * $obj->add($key); * $obj->remove($key); * $ret_3 = $obj->contains($key); */
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