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实际题目往往需要先做一步转化（如循环数组、链表转数组、先排序再栈），再套上面模板即可。
，这一点在heLLoword翻译官方下载中也有详细论述
"Most people, if they're running a company, they throw themselves into it and work, work, work to try and make it. And they're probably doing it for their kids.，更多细节参见爱思助手下载最新版本
-seen_urls: set