Could you do it in O(n) time and O(1) space? https://leetcode.com/problems/palindrome-linked-list/ 判断单链表是否为回文,要求时间复杂度O(n),空间复杂度O(1)。 如果对空间复杂度没有要求,有两种简单的做法。 一种是开个数组,把链表里的值挨个塞进去,然后双指针。 还有一种是做一轮遍历,把单...
Example 1: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 Input:"babad"Output:"bab"Note:"aba"is also a valid answer. Example 2: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 Input:"cbbd"Output:"bb" 原题地址:https://leetcode.com/problems/longest-palindromic-substring/ 2翻译 给定...
[LeetCode][JavaScript]Shortest Palindrome Shortest Palindrome Given a string S, you are allowed to convert it to a palindrome by adding characters in front of it. Find and return the shortest palindrome you can find by performing this transformation. For example: Given"aacecaaa", return"aaacec...
LeetCode 0214题目的核心思路是什么? 怎样判断一个字符串添加字符后能否成为回文串? Shortest Palindrome Desicription Given a string s, you are allowed to convert it to a palindrome by adding characters in front of it. Find and return the shortest palindrome you can find by performing this transform...
Input:s = "a"Output:1Explanation:The longest palindrome that can be built is "a", whose length is 1. Constraints: 1 <= s.length <= 2000 sconsists of lowercaseand/oruppercase English letters only. Accepted in this discussion. 2. The problem discussion is for asking questions about the ...
Can you solve this real interview question? Valid Palindrome - A phrase is a palindrome if, after converting all uppercase letters into lowercase letters and removing all non-alphanumeric characters, it reads the same forward and backward. Alphanumeric c
Leetcode之Palindrome Linked List 问题 问题描述: Given a singly linked list, determine if it is a palindrome. Follow up: Could you do it in O(n) time and O(1) space? 示例: 1->2->9->4->9->2->1 return true; 1->2-&... ...
Leetcode: Palindrome Pairs 1Given a list of unique words, find all pairs of distinct indices (i, j) in the given list, so that the concatenation of the two words, i.e. words[i] +words[j] is a palindrome.23Example 1:4Given words = ["bat", "tab", "cat"]5Return [[0, 1],...
[LeetCode] 409. Longest Palindrome Given a string which consists of lowercase or uppercase letters, find the length of the longest palindromes that can be built with those letters. This is case sensitive, for example"Aa"is not considered a palindrome here....
Learn how to solve the Valid Palindrome issue in Leetcode easily. Check out the code snippets that show you exactly how to do it.