所以借鉴归并排序的方法,自顶向下,先递归的对链表的前半部分和后半部分进行归并排序,最后再merge。 下面代码顺利AC了,时间复杂度为:O(NlogK) public class Solution { ListNode merge2Lists(ListNode list1, ListNode list2) { ListNode head = new ListNode(-1); ListNode current = head; while(list1!=null...
Mergeksorted linked lists and return it as one sorted list. Analyze and describe its complexity 1. Naive Solution 思路:直接的想法依次找出列表中的最小项串接起来。 复杂度分析:时间复杂度:O(k*n), 空间复杂度:O(c)。其中 n为最长子列表长度,c为常量。 ListNode *mergeKLists(vector<ListNode *>&l...
Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. Solution1:堆排序 建立一个大小为k的小顶堆,用来排出堆中最小的元素。分别先将k个list中的第一个元素加入堆中,这样从堆中得到的node是全局最小的 并将这个node在list中的下一个node加入堆中,这样再从...
*/class Solution{public:ListNode*mergeKLists(vector<ListNode*>&lists){intsize=lists.size();if(size==0){returnNULL;}ListNode*result=lists[0];for(inti=1;i<size;i++){result=mergeTwoLists(result,lists[i]);}returnresult;}private:ListNode*mergeTwoLists(ListNode*first,ListNode*second){ListNode*p...
23. 合并K个升序链表 合并k 个排序链表,返回合并后的排序链表。请分析和描述算法的复杂度。 示例: 输入: [ 1->4->5, 1->3->4, 2->6 ] 输出: 1->1->2->3->4->4->5->6 来源:力扣(LeetCode) 链接:https://leetcode-cn.com/problems/merge-k-sorted-lists/ ...
# class ListNode: # def __init__(self, val=0, next=None): # self.val = val # self.next = next class Solution: def mergeKLists(self, lists: List[ListNode]) -> ListNode: k = len(lists) if k == 0: return None pos = set() for i in range(k): if lists[i]: pos.add(i...
class Solution { public: static bool cmp(const ListNode *l1, const ListNode *l2) { return l1->val<l2->val; } ListNode *mergeKLists(vector<ListNode *> &lists) { int n = lists.size(); ListNode *res = new ListNode(-1); if (n<1) ...
Merge all the linked-lists into one sorted linked-list and return it. 中文描述 给你一个链表数组,每个链表都已经按升序排列。 请你将所有链表合并到一个升序链表中,返回合并后的链表。 示例与说明 来源:力扣(LeetCode) 链接:https://leetcode-cn.com/problems/merge-k-sorted-lists 著...
Merge sort always takes an equal amount of space as unsorted arrays. Hence when the list to be sorted is an array, merge sort should not be used for very large arrays. However, merge sort can be used more effectively for linked lists sorting. ...
Baozi Training Leetcode 23 solution: merge K sorted Lists 是在优酷播出的教育高清视频,于2016-03-10 13:58:03上线。视频内容简介:Baozi Training: http://baozitraining.org 微信公众号:baozitraining https://leetcode.com/problems/string-... 北美最真实的计算机