记录踩坑：
做LeetCode每日一题1356. 根据数字二进制下 1 的数目排序时，遇到的坑。题目很简单，利用lowbit操作计算一个数二进制1的个数，接着自定义比较函数进行排序即可，但是C++在类中自定义比较函数不能简单地定义为成员函数，需要定义为静态成员函数。
具体看：Reference to non-static member function must be called
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