带头结点。 /*** Definition for singly-linked list.* public class ListNode {* int val;* ListNode next;* ListNode(int x) { val = x; }* }*/public class Solution {public ListNode mergeKLists
第一次在csdn上写备忘录,以前一直是在笔记本上写,主要是笔记本上可以随意写,只要自己能看懂,在网页上多少都受些限制,另外一方面也是想锻炼下写作能力,为以后的论文做基础吧!最近偶尔上leetcode练些题目,所以也就以这个为主题写一篇试试看,因为能力不足,理解或言辞上会有错误,还望访者不吝赐教,我定当万分感激。 好了,废话也说完了,现在进入正题: 题目: There are two sor
是把一个升序的数组,前面的连续的一部分(可以是空)放在数组的后面,然后再这个数组这中找一个给出的值,数组中不存在重复的元素。 这个题目也是《剑指offer》二分查找的一道例题 class Solution {public:int search(vector<int>& nums, int target) {int l = 0, r = nums.size()-1;while(l <= r)
Given an array where elements are sorted in ascending order, convert it to a height balanced BST. 题目要求将有序数组转换为一个二元查找树。树的题目大部分都可以采用递归来解决,这道题也不例外。一个二元查找树的左子树上的所有节点都小于根节点,右子树上的所有节点都大于根节点,同时二元查找树左子树和右子树上
Follow up for "Search in Rotated Sorted Array": What if duplicates are allowed? Would this affect the run-time complexity? How and why? Write a function to determine if a given target is in the a
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. 用归并排序的思想。 /*** Definition for singly-linked list.* str
Follow up for "Search in Rotated Sorted Array": What if duplicates are allowed? Would this affect the run-time complexity? How and why? Write a function to determine if a given target is in the a
Given a singly linked list where elements are sorted in ascending order, convert it to a height balanced BST. 与排序好的数组转化为二分搜索树的题相似,可以先把链表转化为数组在转化为树。 /*** Definition for singly-linked list.* struct
There are two sorted arrays nums1 and nums2 of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)). 该方法的核心是将原问题转变成一个寻找第k小数的问
【题目链接】:click here~~ 【题目描述】: Almost Sorted Array Time Limit: 4000/2000 MS (Java/Others) Memory Limit: 262144/262144 K (Java/Others) Total Submission(s): 272 Accepted Submission(s): 132
Suppose a sorted array is rotated at some pivot unknown to you beforehand. (i.e., 0 1 2 4 5 6 7 might become 4 5 6 7 0 1 2). Find the minimum element. You may assume no duplicate exists in the arra
I、每个数据只允许出现1次 Remove Duplicates from Sorted List Total Accepted: 7120 Total Submissions: 20880 My Submissions Given a sorted linked list, delete all duplicates such that each element a
I、每个数据只允许出现1次 Remove Duplicates from Sorted Array Total Accepted: 7116 Total Submissions: 21546 My Submissions Given a sorted array, remove the duplicates in place such that each element appear only
Remove Duplicates from Sorted List Given a sorted linked list, delete all duplicates such that each element appear only once. For example, Given 1->1->2, return 1->2. Given 1->1->2->3->3, ret
把k个有序链表merge成一个有序的链表 Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. 使用优先队列,先把所有不为空的链表头放到优先队列中,然后将最大的一个poll()出来,如果这个最大的节点再原链表中有下一个节点那么把它的下一个节点放
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. 解题分析: 对于此题目,应该先加一个头结点,然后依次比较两个有序的 list 然后将比较,将小的连接
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->4Output: 1->1->2->3->4->4