import java.util.List; public class Solution { /** * <pre> * Merge k sorted linked lists and return it as one sorted list. * Analyze and describe its complexity. * * 题目大意: * 合并k个排好的的单链表 * * 解题思路: * 使用一个小堆来
下面就是这道题的解法,跟上面的方法一样一样的,就是在mergeTwoList时候是对linkedlist做,套用Merge 2 sorted list解法即可,代码如下: 1publicListNode mergeKLists(ArrayList<ListNode> lists) { 2if(lists==null|| lists.size()==0) 3returnnull; 4returnMSort(lists,0,lists.size()-1); 5} 6 7publicL...
public ListNode mergeKLists(ListNode[] lists) { //input check //开始没加lists.length==0的判断,导致lists.length==0时会无限调用ListNode leftHead = merge(lists, left, mid); 因为left==0, right==-1 if(lists==null || lists.length==0) return null; return merge(lists, 0, lists.length-1...
javapublic class Solution { public ListNode mergeKLists(List<ListNode> lists) { if (lists.isEmpty()) return null; return merge(lists, 0, lists.size() - 1); } public ListNode merge(List<ListNode> lists, int start, int end) { if (start == end) return lists.get(start); int mid =...
Java 四,解题过程 第一搏 一,题目描述 英文描述 You are given an array of k linked-lists lists, each linked-list is sorted in ascending order. Merge all the linked-lists into one sorted linked-list and return it. ...
一个user要得到最新的tweets, 首先找到关注人,把他们的tweets消息列表存到PriorityQueue里,就变成了Merge k Sorted Lists. 这里用OOD是因为更接近现实情况。twitter就是一个用户看到关注人消息集合的媒体。 基本的entity就是消息tweets和用户user。 tweets要体现出时间线,就要模拟linkedlist。
用一个大小为K的最小堆(用优先队列+自定义降序实现)(优先队列就是大顶堆,队头元素最大,自定义为降序后,就变成小顶堆,队头元素最小),先把K个链表的头结点放入堆中,每次取堆顶元素,然后将堆顶元素所在链表的下一个结点加入堆中。 代码语言:javascript ...
Time complexity for both methods are O(n + m) because they go through each of the node once in both lists. Space complexity for the first one is O(1) and O(n + m) for second one beacuse the recursion won't return until it reaches end of both lists. Merge K Sorted Lists 解法一...
The merge step is the solution to the simple problem of merging two sorted lists(arrays) to build one large sorted list(array). The algorithm maintains three pointers, one for each of the two arrays and one for maintaining the current index of the final sorted array. ...
Step 7:Combine both arrays,[8, 9, 10]and[2, 3, 4]in a sorted manner by comparing their values. So at last we have got our sorted array. 3. Implementation of Merge Sort in Java Let us hit the keyboard and write a program to demonstrate how to implement merge sort in Java. ...