Kth Largest Element II Lintcode - 璨璨要好好学习 - 博客园



Kth Largest Element II Lintcode - 璨璨要好好学习 - 博客园

Find K-th largest element in an array. and N is much larger than k.

 Notice

You can swap elements in the array

Example

In array [9,3,2,4,8], the 3rd largest element is 4.

In array [1,2,3,4,5], the 1st largest element is 52ndlargest element is 43rd largest element is 3 and etc.

这道题可以用快速排序/快速选择的思想来做。

快排也写了不止一次了,但还是不够熟练。。。希望经过这次练习可以熟练一些。

需要注意的是注释的地方是不需要右边向左移动的,因为需要右边的指针停在第一个比pivot大的数的位置上,这样才可以调换。


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