问题描述 无序数组求第K大的数,其中K从1开始算. 例如:[0,3,1,8,5,2]这个数组,第2大的数是5 OJ可参考:LeetCode_0215_KthLargestElementInAnArray 堆解法 设置一个小根堆,先把前K个数放入小根堆,对于这前K个数来说,堆顶元素一定是第K大的数,接下来的元素继续入堆,但是每入一个就弹出一个,最后,堆顶元素就是整个数组的第K大元素.代码如下: public static int findKthLargest3(int[] nums, int k)
思路: 利用快速排序的划分思想 可以找出前k大数,然后不断划分 直到找到第K大元素 代码: #include <iostream> #include <algorithm> #include <cstdio> using namespace std; int findK(int left, int right, int arr[], int k) { if(left >= right) return arr[left]; int first = left, las
求一组N个数中的第k个最大者,设k=N/2. import java.util.Random; public class K_Max { /** * @param args */ //求第K大的数,保证K大于等于1,小于等于array.length/2哦 public static int TopK(int array[],int K) { int topk[] = new int [K]; for(int i = 0; i<topk.length;i++) topk[i] = array[i]
The k-th Largest Group Time Limit: 2000MS Memory Limit: 131072K Total Submissions: 8353 Accepted: 2712 Description Newman likes playing with cats. He possesses lots of cats in his home. Because the number of cats is really huge, Newman wants to g
The k-th Largest Group Time Limit: 2000MS Memory Limit: 131072K Total Submissions: 8807 Accepted: 2875 Description Newman likes playing with cats. He possesses lots of cats in his home. Because the number of cats is really huge, Newman wants to g
KiKi's K-Number Time Limit: 4000/2000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 3864 Accepted Submission(s): 1715 Problem Description For the k-th number, we all should be very familiar with it. Of course,to
There are two sorted arrays nums1 and nums2 of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)). t int MAX = 0x7fffffff, MIN = 0x80000000; int kth(vector<int>& nums1, vec
//下面两种part效率比较:相同运算量下part比part2快5倍左右,part2写法简单但是效率低 #include "stdafx.h" #include <iostream> #include <stdio.h> using namespace std; int part(int *arr, int l , int r) { c_num += r - l; swap(arr[r],arr[l+rand()%(r-l)]); int q = r--; wh
传送门 The k-th Largest Group Time Limit: 2000MS Memory Limit: 131072K Total Submissions: 8690 Accepted: 2847 Description Newman likes playing with cats. He possesses lots of cats in his home. Because the number of cats is really huge, Newman wants
