背景 近期開始研究算法,于是在leetcode上做算法题,第五题Longest Palindromic Substring便是关于回文子串的。 什么是回文字串 回文字符串是指将该字符串前后颠倒之后和该字符串一样的字符串。比如:a,aaaa,aba,abba… 最长回文子串 要求最长回文子串,就须要遍历每个子串,时间复杂度是O(N²);推断字串是不是回文,时...
Given a string S, find the longest palindromic substring in S. You may assume that the maximum length of S is 1000, and there exists one unique longes
Example 1: Input: "babad" Output: "bab" Note: "aba" is also a valid answer. 1. 2. 3. Example 2: Input: "cbbd" Output: "bb" 1. 2. 思路 假如输入的字符串长度就是1 那么这个字符串的最长回文串就是它自己,长度就是1 假如字符串长度为2,它要是回文串的化,就需要两个字符是相等的。 ...
LeetCode-Longest Palindromic Substring Description: Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000. Example 1: Input: “babad” Output: “bab” Note: “aba” is also a valid answer. Example 2: Input: “cbbd” Output:...
LeetCode算法题有一个技巧:先看每道题的example,大部分情况看完example就能理解题目意思;如果看完example还有疑惑,可以再回过头来看英文题目。这样也可以节省一点时间~ 题目描述 Given a string s, return the longest palindromic substring in s. 经典的题目,最长回文子串,所谓回文字符串:正反字符串相等 Examples1th...
简介 LeetCode刷题，是为了获得面经，这是题目5的java实现解法 工具/原料 笔记本 eclipse 方法/步骤 1 题目叙述Given a stringS, find the longest palindromic substring inS. You may assume that the maximum length ofSis 1000, and there exists one unique longest palindromic substring.2 本体可以使用动态规划...
5. Longest Palindromic Substring Given a strings, returnthe longestpalindromicsubstringins. Example 1: Input:s = "babad"Output:"bab"Explanation:"aba" is also a valid answer. Example 2: Input:s = "cbbd"Output:"bb" Constraints: 1 <= s.length <= 1000...
Longest Palindromic Substring LeetCode 原题,这里主要说一下自己的动态规划解法和思路,希望对大家理解这个有所帮助。 暴力解法为遍历所有子串,逐个判断是否是回文字串。 接下来我们来优化暴力解法,暴力解法的问题在于没有用到回文字串的特性,只是用了定义去检验一个字串是不是回文,所以这个题的题眼在于利用回文字串的...
【算法】Longest Palindromic Substring 最近刷LeetCode遇到一个比较有意思的题目(Longest Palindromic Substring),求一个字符串的最大回文子串。题目本身并不难,但需要理清思路才好理解,借此文记录下。 题目 Given a string s, find the longest palindromic substring in s. You may assume that the maximum length...
algorithms leetcode edit-distance stock-market binary-search-tree leetcode-solutions dynamic-programming longest-common-subsequence pascals-triangle coin-change leetcode-java leetcode-cpp longest-increasing-subsequence maximum-subarray longest-palindromic-substring longest-palindromic-subsequence coin-change-2 ult...