Given k sorted integer arrays, merge them into one sorted array. Example Given 3 sorted arrays: [ [1, 3, 5, 7], [2, 4, 6], [0, 8, 9, 10, 11]] return [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]. Challenge Do it in O(N log k). N is the total number of integ…

This problem can be solved by using a heap. The time is O(nlog(n)). Given m arrays, the minimum elements of all arrays can form a heap. It takes O(log(m)) to insert an element to the heap and it takes O(1) to delete the minimum element. public class…

Discription: Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. Subscribe to see which companies asked this question. 思路:其实就是归并排序的最后一步归并操作.思想是递归分治,先把一个大问题分成2个子问题,然后对2个子问题的解进行合并.经过一次遍历就能找出已经有序的序列.就算是题目中给…

Merge K sorted Array 跟Merge K sorted lists不同在于,从PQ里poll出来以后不知道下一个需要被加入PQ的是哪一个 所以需要写一个wrapper class package fbPractise; import java.util.*; public class MergeKLists { static class Pair { int listIndex; int idInList; int value; public Pair(int l, int i…

Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. 解法1: 采用递归的方法,不管合并几个,归根到底还是需要两两合并. 首先想到的是前两个先合并,然后再跟第三个合并,然后第四个....但是这种做法效率不高. 换个思路,采用分治法,对数量超过2的任务进行拆分,直到最后只有一个或两个链表再进行合并.代码如下: /** * Definition for si…

Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. 这道题让我们合并k个有序链表,之前我们做过一道Merge Two Sorted Lists 混合插入有序链表,是混合插入两个有序链表.这道题增加了难度,变成合并k个有序链表了,但是不管合并几个,基本还是要两两合并.那么我们首先考虑的方法是能不能利用之前那道题的解法来解答此题.答案是肯定的,但是需要修改…

问题: Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. 官方难度: Hard 翻译: 合并k个已排序的链表,得到一个新的链表并且返回其第一个节点.分析并阐述其复杂度. 这是No.021(Merge Two Sorted Lists)的深入研究. 可以借鉴归并排序的思想,对于长度为k的数组,依次进行二路归并,返回这两个链表合并之后的头结点(利用No.…

1. Merge Two Sorted Lists 我们先来看这个 问题: Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists. 是的,这是一个非常简单链表操作问题.也许你只需要花几分种便能轻松写出代码. 2. Merge k Sorted Lists 我们现在来研究这…

题目链接 Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. 合并k个有序的链表,我们假设每个链表的平均长度是n.这一题需要用到合并两个有序的链表子过程 算法1: 最傻的做法就是先1.2合并,12结果和3合并,123结果和4合并,…,123..k-1结果和k合并,我们计算一下复杂度. 1.2合并,遍历2n个节点 12结果和3合并,遍历3n个节点 123…

Merge k Sorted Lists Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. 两个方法: 方法1. 利用 STL 中的 multiset (根据结点内的值)自动对指针排序.空间 O(N), 时间 O(NlogN). (亦可用于 k 个无序链表).(AC: 164ms) /** * Definition for singly-linked…