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. 思路:使用伪头部 class Solution { public: ListNode *mergeTwoLists(ListNode *l1, ListNode *l2) { ListNode fakehead();…

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. 递归实现: /** * Definition for singly-linked list. * struct ListNode { * int val; * ListNode *next; * ListNode(i…

Merge k Sorted Lists Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity.   采用优先队列priority_queue 把ListNode放入优先队列中,弹出最小指后,如果该ListNode有下一个元素,则把下一个元素放入到队列中     /** * Definition for singly-linked list. * stru…

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. 题目意思很简单,就是合并两个有序链表,头需要是原先的两个链表中的一个.这道题在本科生的数据结构书上就有讲,原理就就是:两个链表A,B分别逐个遍历,判断两个元素的大小,取小的作为新链表的下一个节点.让小学生做,他们也能…

题目:Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. 题意:把k个排序成一个有序链表. 用优先队列先把k个链表遍历一遍把值存起来,在建一个新链表吧数从优先队列里一个个放进去,注意空指针的判断. /** * Definition for singly-linked list. * struct ListNode { * int val; * List…

这道题是LeetCode里的第21道题. 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 这道题需要考虑的地方挺多的,首先是头节点的处理,还有尾节点的链接问题.对于头节点,我的想法是先对 l1, l2 的值进行比较,然后把 l1 指向头节点值小的,这样保证了 l1 绝对小于等于 l2,也就是说头节点的链接问题…

1. 原题链接 https://leetcode.com/problems/merge-two-sorted-lists/description/ 2. 题目要求 给出两个已经从小到大排序的链表ls1.ls2,进行合并,合并后仍有序,返回合并后的链表 3. 解题思路 创建一个表头指针headPointer和一个定位指针locatePointer,headPointer用来保存头结点. 同时对ls1和ls2进行遍历,当ls1的值小于ls2的值时,locatePointer指向ls1,否则指向ls2…

Remove all elements from a linked list of integers that have value val. ExampleGiven: 1 --> 2 --> 6 --> 3 --> 4 --> 5 --> 6, val = 6Return: 1 --> 2 --> 3 --> 4 --> 5 思路:简单题. //Definition for singly-linked list. struct ListNod…

Contains Duplicate Given an array of integers, find if the array contains any duplicates. Your function should return true if any value appears at least twice in the array, and it should return false if every element is distinct. 思路:简单题用set bool cont…

[LeetCode]120. Triangle 解题报告(Python) 作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 题目地址https://leetcode.com/problems/triangle/description/ 题目描述: Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjac…