nums[p]#如果 p(位置) 大于 k,说明第 k 小的元素在 p 的左侧,因此算法递归地在左侧部分继续寻找ifp>k:returnquickSelect(l,p-1)elifp<k:returnquickSelect(p+1,r)else:returnnums[p]# 如果p正好是第k小的元素的索引,返回该元素# 随机打乱nums,以提高算法的平均性能,避免最坏情况random.shuffle(nums...
Leetcode-215. Kth Largest Element in an Array(快排) Find the kth largest element in an unsorted array. Note that it is the kth largest element in the sorted order, not the kth distinct element. Example 1: Input: [3,2,1,5,6,4] and k = 2 Output: 5 Example 2: Input: [3,2,...
215. Kth Largest Element in an Array 方法1:quick-sort 方法2: 方法3: 易错点: YRB: https://www.cnblogs.com...快排的思想,取一个pivot,排序结束一遍pivot的位置就是它的order statistic。如果pivot的pos是k-1,可以直接返回pivot;如果pos>k - 1, 说明kth 215 Kth Largest Element in an Array # ...
代码如下: importheapqclassSolution(object):deffindKthLargest(self, nums, k): min_heap = nums[:k] heapq.heapify(min_heap)# create a min-heap whose size is kfornuminnums[k:]:ifnum > min_heap [0]: heapq.heapreplace(min_heap , num)# or use:# heapq.heappushpop(min_heap, num)retu...
https://leetcode.com/problems/kth-largest-element-in-an-array/ Find the kth largest element in an unsorted array. Note that it is the kth largest element in the sorted order, not the kth distinct element. For example, Given [3,2,1,5,6,4] and k = 2, return 5. Note: You may ...
Given an integer arraynumsand an integerk, returnthekthlargest element in the array. Note that it is thekthlargest element in the sorted order, not thekthdistinct element. Can you solve it without sorting? Example 1: Input:nums = [3,2,1,5,6,4], k = 2Output:5 ...
Kth Largest Element in an Array 数组中第k大的数字 开始的时候我的脑子里产生了很多天马行空的想法,比如用一个queue去重新存放顺序之类的。但是那显然是不合理且乱糟糟的。kth largest,就是一个排序问题。这里又一次用到了分治法,而且用到了快速排序里的左右互相交换的方法。左右互相交换,可以保证作为pivot的...
Find the kth largest element in an unsorted array. Note that it is the kth largest element in the sorted order, not the kth distinct element. For example, Given [3,2,1,5,6,4] and k = 2, return 5. Note: You may assume k is always valid, 1 ≤ k ≤ array’s length. ...
英文网址:215. Kth Largest Element in an Array。 中文网址:215. 数组中的第K个最大元素。 思路分析 求解关键:这是一个常规问题,使用借用快速排序的 partition 的思想完成。关键在于理解 partition 的返回值,返回值是拉通了整个数组的索引值,这一点是非常重要的,不要把问题想得复杂了。
Kth Largest Element in an Array Find the kth largest element in an unsorted array. Note that it is the kth largest element in the sorted order, not the kth distinct element. For example, Given [3,2,1,5,6,4] and k = 2, return 5. ...