小榕流光的专栏

题目链接：https://leetcode.com/problems/palindrome-linked-list/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?思路：如果不限制O(1)

题目链接：https://leetcode.com/problems/valid-palindrome/Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases.For example,"A man, a plan,

题目链接：https://leetcode.com/problems/palindrome-number/Determine whether an integer is a palindrome. Do this without extra space.click to show spoilers.Some hints:Could negative integers

题目链接：https://leetcode.com/problems/palindrome-permutation/Given a string, determine if a permutation of the string could form a palindrome.For example,"code" -> False, "aab" -> True, "ca

题目链接: https://leetcode.com/problems/palindrome-permutation-ii/Given a string s, return all the palindromic permutations (without duplicates) of it. Return an empty list if no palindromic permu

题目链接：https://leetcode.com/problems/longest-palindromic-substring/Given a string S, find the longest palindromic substring in S. You may assume that the maximum length of S is 1000, and there e

题目链接：https://leetcode.com/problems/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 let