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三数之和时间复杂度分析求证
我对于三个数的和的这段代码时间复杂度分析是这样，不知对不对，还请不吝赐教：
Python内建的sort函数是timsort，时间复杂度是nlogn，后面两个嵌套循环是n*(n/2)，推演公式是:nlogn + n*(n/2) = n * (logn + n/2)，根据主次分明法则，去掉低阶系数logn和常数2，最后就是n^2。
强！
佩服作者的毅力！
作者好
我也是学了王争老师的数据结构之美的同学，目前也在春节七天练阶段，当我有pull request的时候，希望作者能通过哈（大四学生党一枚～，另外我也是iOS～）
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