合并k个排序的列表 Merge k Sorted Lists

2018-11-25 22:58:52 问题描述: 问题求解: 本题可以使用优先队列高效的进行求解,整体的时间复杂度为O(nlogk). public ListNode mergeKLists(ListNode[] lists) { ListNode dummy = new ListNode(-1); ListNode prev = dummy; int k = lists.length; PriorityQueue<ListNode> pq = new PriorityQueue<&g…

LeetCode 23. 合并K个排序链表（Merge k Sorted Lists）

题目描述合并 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 解题思路利用分治的思想,划分k个排序链表为两半,递归的合并两部分中的链表.对于单个链表直接返回,对于两个链表调用merge函数,返回合并好的排序链表. 代码 /** * Definition for singly-li…

LeetCode 21. 合并两个有序链表（Merge Two Sorted Lists）

题目描述将两个有序链表合并为一个新的有序链表并返回.新链表是通过拼接给定的两个链表的所有节点组成的. 示例: 输入:1->2->4, 1->3->4 输出:1->1->2->3->4->4 解题思路首先找到新链表头节点,即两个链表头节点值较小的节点,然后以头节点所在链表为准,依次将另一个链表插入到对应位置中. 代码 /** * Definition for singly-linked list. * struct ListNode { * int…

LeetCode 23. 合并K个排序链表(Merge Two Sorted Lists)

23. 合并K个排序链表 23. Merge k Sorted Lists 题目描述合并 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. LeetCode23. Merge k Sorted Lists困难示例: 输入: [ 1->4->5, 1->3->4, 2->6] 输出: 1->1->2->3->4->4->5->6 Java 实现 public class ListNode { int va…

LeetCode 21. 合并两个有序链表(Merge Two Sorted Lists)

21. 合并两个有序链表 21. Merge Two Sorted Lists 题目描述将两个有序链表合并为一个新的有序链表并返回.新链表是通过拼接给定的两个链表的所有节点组成的. LeetCode21. Merge Two Sorted Lists 示例: 输入: 1->2->4, 1->3->4 输出: 1->1->2->3->4->4 Java 实现 ListNode 类 class ListNode { int val; ListNode n…

LeetCode之“链表”：Merge Two Sorted Lists && Merge k Sorted Lists

1. Merge Two Sorted Lists 题目链接题目要求: 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. 这道题目题意是要将两个有序的链表合并为一个有序链表.为了编程方便,在程序中引入dummy节点.具体程序如下: /** * Definitio…

Leetcode 23.Merge Two Sorted Lists Merge K Sorted Lists

Merge Two Sorted Lists 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. 依次拼接复杂度时间 O(N) 空间 O(1) 思路该题就是简单的把两个链表的节点拼接起来,我们可以用一个Dummy头,将比较过后的节点接在这个Dummy头之后.最后…

21.Merge Two Sorted Lists 、23. Merge k Sorted Lists

21.Merge Two Sorted Lists 初始化一个指针作为开头,然后返回这个指针的next class Solution { public: ListNode* mergeTwoLists(ListNode* l1, ListNode* l2) { ListNode* dummy = ); ListNode* p = dummy; while(l1 && l2){ if(l1->val <= l2->val){ p->next = l1; p = p-&…

21. Merge Two Sorted Lists(合并2个有序链表)

21. Merge Two Sorted Lists 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 需要排序!!! [2,4][1] 输出1 2 4 而不是2 4 1 递归版!! class Solution { public ListNode mergeTwo…

lettcode21. Merge Two Sorted Lists

lettcode21. Merge Two Sorted Lists 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. 从小到大排列的两个数组,合并成一个数组.递归的方法.注意:两个数组都为空的情况. This solution is not a tail-recu…

Leetcode练习题21. Merge Two Sorted Lists

题目描述(easy) Merge Two Sorted Lists 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. Example: Input: 1->2->4, 1->3->4 Output: 1->1->2->3->4-…

Leetcode 题目整理-5 Valid Parentheses & Merge Two Sorted Lists

20. Valid Parentheses Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. The brackets must close in the correct order, "()" and "()[]{}" are all valid but "(]&quo…

刷题21. Merge Two Sorted Lists

一.题目说明这个题目是21. Merge Two Sorted Lists,归并2个已排序的列表.难度是Easy! 二.我的解答既然是简单的题目,应该一次搞定.确实1次就搞定了,但是性能太差: Runtime: 20 ms, faster than 8.74% of C++ online submissions for Merge Two Sorted Lists. Memory Usage: 9.4 MB, less than 5.74% of C++ online submissions…

Merge Two Sorted Lists & Remove Nth Node From End of List

1.合并两个排好序的list Merge Two Sorted Lists 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. 2.删除list倒数第n个元素 Remove Nth Node From End of List Given a linked list,…

C# 写 LeetCode easy #21 Merge Two Sorted Lists

21. Merge Two Sorted Lists 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. Example: Input: 1->2->4, 1->3->4 Output: 1->1->2->3->4->4 代…

[leetcode] 21. Merge Two Sorted Lists (Easy)

合并链表 Runtime: 4 ms, faster than 100.00% of C++ online submissions for Merge Two Sorted Lists. class Solution { public: ListNode *mergeTwoLists(ListNode *l1, ListNode *l2) { //1 2 4 . 1 3 4 ListNode *res = ); ListNode *cur = res; while (l1 != NULL &&am…

LeetCode--LinkedList--21.Merge Two Sorted Lists (Easy)

21. Merge Two Sorted Lists (Easy) 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. Example: Input: 1->2->4, 1->3->4 Output: 1->1->2->3->4-…

[LintCode] Merge Two Sorted Lists 混合插入有序链表

Merge two sorted (ascending) linked lists and return it as a new sorted list. The new sorted list should be made by splicing together the nodes of the two lists and sorted in ascending order. Have you met this question in a real interview? Yes Exampl…

Merge Two Sorted Lists

Merge Two Sorted Lists https://leetcode.com/problems/merge-two-sorted-lists/ 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. 算法思想: 连接两个排好序(假设升序,降序类似)的链表,这是一…

[Leetcode][Python]21: Merge Two Sorted Lists

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 21: Merge Two Sorted Listshttps://oj.leetcode.com/problems/merge-two-sorted-lists/ Merge two sorted linked lists and return it as a new list.The new list should be made by splicing together…

leetcode-algorithms-21 Merge Two Sorted Lists

leetcode-algorithms-21 Merge Two Sorted Lists 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. Example: Input: 1->2->4, 1->3->4 Output: 1->1->2-…

LeetCode: Merge Two Sorted Lists 解题报告

Merge Two Sorted Lists 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. Show Tags SOLUTION 1: 使用dummynode记录头节点的前一个,轻松完成,2分钟就AC啦! /** * Definition for singly-…

Merge Two Sorted Lists - LeetCode

目录题目链接注意点解法小结题目链接 Merge Two Sorted Lists - LeetCode 注意点两个链表长度可能不一致解法解法一:先比较两个链表长度一致的部分,多余的部分直接加进答案链表即可.时间复杂度为O(n) /** * Definition for singly-linked list. * struct ListNode { * int val; * ListNode *next; * ListNode(int x) : val(x), next(NULL)…

[Leetcode Week4]Merge Two Sorted Lists

Merge Two Sorted Lists题解原创文章,拒绝转载题目来源:https://leetcode.com/problems/merge-two-sorted-lists/description/ Description 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 t…

21. Merge Two Sorted Lists【easy】

21. Merge Two Sorted Lists[easy] 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. 解法一: /** * Definition for singly-linked list. * struct ListNode { * int val…