Palindrome Names Kattis - names Anna and Bob are having a baby. They both enjoy the advantage of having palindrome names, meaning that their names are spelled the same way forwards and backwards. Wanting to be good parents, they decide to give their…

题目链接 https://open.kattis.com/problems/names 题意 给出一个字符串 有两种操作 0.在字符串的最末尾加一个字符 1.更改字符串中的一个字符 求最少的操作步数使得字符串变成回文串 思路 由于回文串具有对称关系 所以给出一串回文串 最多的操作步数 就是 len / 2 只改一半不同的字符就可以了 所以我们可以先将字符串倒置 然后依次一步一步 挪过去 与原串比较 比出有多少个不同的字符 那么操作次数就是 挪位数+不同字符个数/ 2 比如说 样例 kaia ai…

H - Palindrome Names 题意:给定一个字符串,每次可以向末尾添加一个字符或者更改一个字符.求使得字符串为回文串(从前往后和从后往前读一样)所花费的最小步数. 题解: 看来需要多思考啊!题目并不难,应该是见得少.先写个思路. 想让它变成回文串,那么可以向后面添加也可以更改其中一个元素.可以这样想,我在后面添加一个字符,那么我需要判断添加后还有几个不匹配,最小步数就是不匹配的个数+1.我要是就修改,最小步数就是不匹配的个数. 我需要从这两种操作中选择最小的就是答案.关键在于我添加一…

A positive integer is called a palindrome if its representation in the decimal system is the same when read from left to right and from right to left. For a given positive integer K of not more than 1000000 digits, write the value of the smallest pal…

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. Note: Assume the leng…

Given 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. Example 1:Given words = ["bat", "tab", "cat"]Ret…

Given a string s, return all the palindromic permutations (without duplicates) of it. Return an empty list if no palindromic permutation could be form. For example: Given s = "aabb", return ["abba", "baab"]. Given s = "a…

Given a string, determine if a permutation of the string could form a palindrome. For example,"code" -> False, "aab" -> True, "carerac" -> True. Hint: Consider the palindromes of odd vs even length. What difference d…

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? 这道题让我们判断一个链表是否为回文链表,LeetCode中关于回文串的题共有六道,除了这道,其他的五道为Palindrome Number 验证回文数字,Validate Palindrome 验证回文字符串,Palindrome Partitioning 拆分回文…

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 "aaacecaaa&qu…