php数据流中第K大元素的计算方法及代码分析

class KthLargest extends SplMinHeap {

    /**
    * @param Integer $k
    * @param Integer[] $nums
    */
    static $nums;
    public $k;
    function __construct($k, $nums) {
        $this->k = $k;
        // 遍历初始化数组，分别插入堆中
        foreach ($nums as $v) {
            $this->add($v);
        }
    }
   
    * @param Integer $val
    * @return Integer
    function add($val) {
       // 维持堆的大小为k，当堆还未满时，插入数据。
        if ($this->count() < $this->k) {
            $this->insert($val);
        } elseif ($this->top() < $val) {
        // 当堆满的时候，比较要插入元素和堆顶元素大小。大于堆顶的插入。堆顶移除。
            $this->extract();
        return $this->top();
    }}
    * Your KthLargest object will be instantiated and called as such:
    * $obj = KthLargest($k, $nums);
    * $ret_1 = $obj->add($val);

class KthLargest {
    /**
     * @param Integer $k
     * @param Integer[] $nums
     */
    static $nums;
    public $k;
    function __construct($k, $nums) {
        $this->k = $k;
        $this->nums = $nums;
    }
  
    /**
     * @param Integer $val
     * @return Integer
     */
    function add($val) {
        array_push($this->nums, $val);
        rsort($this->nums);
        return $this->nums[$this->k - 1];
    }
}

class KthLargest {
    /**
     * @param Integer $k
     * @param Integer[] $nums
     */
    static $nums;
    public $k;
    function __construct($k, $nums) {
        $this->k = $k;
        $this->nums = $nums;
    }
  
    /**
     * @param Integer $val
     * @return Integer
     */
    function add($val) {
        array_push($this->nums, $val);
        rsort($this->nums);
        $this->nums = array_slice($this->nums, 0, $this->k);
        
        return $this->nums[$this->k - 1];
    }
}