QuickSelectO(n)∼O(n2)+O(1)O(n)∼O(n2)+O(1) Java C++ Python Go 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 Examp...
You may assume k is always valid, 1 ≤ k ≤ array's length. 链接:http://leetcode.com/problems/kth-largest-element-in-an-array/ 题解: 找数组中第k大的元素,可以用heap,Radix sort或者Quick-Select。不过Quick-Select的Time Compleixty只有在Amorized analysis上才是O(n)。下面是使用Java自带的prior...
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 原题链接在这里:https://leetcode.com/problems/kth-largest-element-in-an-array/ 题目: 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, ...
找第K大/小的用quick select或heap sort。 /* * @lc app=leetcode id=215 lang=cpp * * [215] Kth Largest Element in an Array */ // @lc code=start class Solution { public: int findKthLargest(vector<int>& nums, int k) { const auto partition = [&](int l, int r) { const int...
Leetcode: 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,return5....
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. ...
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 ...
class Solution: # @param nums {int[]} an integer unsorted array # @param k {int} an integer from 1 to n # @return {int} the kth largest element def kthLargestElement2(self, nums, k): # Write your code here import heapq heap = [] for num in nums: heapq.heappush(heap, num)...
class Solution{public:intfindKthLargest(vector<int>&nums,intk){sort(nums.rbegin(),nums.rend());returnnums[k-1];}}; Algorithm to Find Kth Smallest/Largest Element in the Array by Using the Heap A Heap is a data structure that is also a tree. The heap satifies that any parent nodes...