codetop4：数组中第K个最大元素
数组中第K个最大元素
给定整数数组 nums 和整数 k，请返回数组中第 **k** 个最大的元素。
请注意，你需要找的是数组排序后的第 k 个最大的元素，而不是第 k 个不同的元素。
你必须设计并实现时间复杂度为 O(n) 的算法解决此问题。
示例 1:
输入: [3,2,1,5,6,4], k = 2
输出: 5示例 2:
输入: [3,2,3,1,2,4,5,5,6], k = 4
输出: 4思路
送分题
class Solution:
def findKthLargest(self, nums: List[int], k: int) -> int:
nums.sort(reverse=True)
return nums[k-1]这样写比我使用希尔排序或者快速排序时间都少，这个是什么操作？
class Solution:
def findKthLargest(self, nums: List[int], k: int) -> int:
def backtrac(nums):
if not nums or len(nums)==1:
return nums
left=[x for x in nums if x<nums[0]]
mid=[x for x in nums if x==nums[0]]
right=[x for x in nums if x>nums[0]]
return backtrac(left)+mid+backtrac(right)
return backtrac(nums)[-k]
上面是使用sort函数，下面是使用快速排序。
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