1.Problem Find thekth largest element in an unsorted array. Note that it is the kth largest element in the sorted order, not the kth distinct element. 题意很简单,找到一个一维数组中的第K大的数并返回。数组中第K大的数也是面试中经常考察的问题。现在就借Leetcode上的这题来详细总结下这个问题的...
classSolution:#@param k & A a integer and an array#@return ans a integerdefkthLargestElement(self, k, A):iflen(A) <k:returnNone start=0 end= len(A) - 1index=self.partition(A, start, end)whileindex != k-1:ifindex > k-1:end= index - 1#res处的元素本身确实不合格,可以去除减...
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 Example 2: Input:nu...
class Solution { public: int findKthLargest(vector<int>& nums, int k) { int left = 0,right = nums.size(); while(true){ int pos = partition(nums, left, right); if(pos == k-1) return nums[pos]; if(pos > k-1) right = pos; else left = pos+1; } } int partition(vector<...
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。
/* * @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 ind = rand() % (r - l + 1) + l...
classSolution:deffindKthLargest(self,nums,k):""" :type nums: List[int] :type k: int :rtype: int """returnself.findKthSmallest(nums,len(nums)+1-k)deffindKthSmallest(self,nums,k):# if len(nums) == 1:# return nums[0]pivot=self.partition(nums,0,len(nums)-1)ifk>pivot+1:return...
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]andk=2,return5. Note: You may assume k is always valid, 1 ≤ k ≤ array's length. ...
https://leetcode.com/problems/kth-largest-element-in-an-array/description/ 内置排序beat 99%,重新写一下归并和快排比比试试。 自己写的归并排序,beat 40% . 快速排序由于基准点问题第一次直接 TLE. 好吧,修改一下,选取基准点的方法基本是: 1. 取左端或右端。 2. 随机取。 3. 取...
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...