/*
*
* ┌─┐ ┌─┐
* ┌──┘ ┴───────┘ ┴──┐
* │ │
* │ ─── │
* │ ─┬┘ └┬─ │
* │ │
* │ ─┴─ │
* │ │
* └───┐ ┌───┘
* │ │
* │ │
* │ │
* │ └──────────────┐
* │ │
* │ ├─┐
* │ ┌─┘
* │ │
* └─┐ ┐ ┌───────┬──┐ ┌──┘
* │ ─┤ ─┤ │ ─┤ ─┤
* └──┴──┘ └──┴──┘
* 神兽保佑
* +----------------------------------------------------------------------
* | [I Am A program Dragon] [Code php ]
* +----------------------------------------------------------------------
* | Copyright (c) 2018 liu All rights reserved.
* +----------------------------------------------------------------------
* | Author: liu
* +----------------------------------------------------------------------
*/
*
* ┌─┐ ┌─┐
* ┌──┘ ┴───────┘ ┴──┐
* │ │
* │ ─── │
* │ ─┬┘ └┬─ │
* │ │
* │ ─┴─ │
* │ │
* └───┐ ┌───┘
* │ │
* │ │
* │ │
* │ └──────────────┐
* │ │
* │ ├─┐
* │ ┌─┘
* │ │
* └─┐ ┐ ┌───────┬──┐ ┌──┘
* │ ─┤ ─┤ │ ─┤ ─┤
* └──┴──┘ └──┴──┘
* 神兽保佑
* +----------------------------------------------------------------------
* | [I Am A program Dragon] [Code php ]
* +----------------------------------------------------------------------
* | Copyright (c) 2018 liu All rights reserved.
* +----------------------------------------------------------------------
* | Author: liu
* +----------------------------------------------------------------------
*/