148. Sort List - YRB - 博客园



148. Sort List - YRB - 博客园

Sort List, 链表排序,一看到O(nlogn)就想到使用merge sort。 对于merge sort,还要研究一下bottom-up和top-down的区别,优劣点,如何继续优化等等,比如n较小时使用insertion sort, 了解Python的Tim-sort之类。也要研究一下链表的Quicksort,以及3-way Quicksort。 当时电面Amazon的时候写排序作死选择Quicksort,还尝试写了一个3-way Quicksort,由于理解不深同时当天也头昏脑胀没解释清楚,被面试官白大姐秒拒,如此浪费一年机会,甚是可惜。对于各种排序的stalability也要好好复习。熟能生巧,多练吧。另外,external sorting,B tree,A* tree,indexing,paging之类的也要复习。聊远了...

这题使用Merge Sort的话,还是按照Divide-and-Conquer分治。 两个辅助方法是findMid找中点,以及merge合并。 merge的话完全可以使用"Merge Sorted List"的代码,找中点我们也使用过,所以可以直接写。


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