* - this.stack：单调递减栈，存储「价格对应的索引」，栈顶→栈底索引对应的价格单调递减
theguardian.com
，推荐阅读WPS官方版本下载获取更多信息
Card trading — Trade Pokémon cards with other players and get expert tips on how to play from event leaders.。业内人士推荐谷歌浏览器【最新下载地址】作为进阶阅读
Dragonite and Charizard Dancing to Ariana Grande