It can be shown that all other substrings contain either "aaa" or "cb" as a substring. Example 2: Input: word = "leetcode", forbidden = ["de","le","e"] Output: 4 Explanation: There are 11 valid substrings in word: "l", "t", "c", "o", "d", "tc", "co", "od", ...
LeetCode 5(Longest Palindromic Substring)的常见解法有多种,每种解法都有不同的特点和时间、空间复杂度。以下是几种常见解法及其特点: 1. 动态规划 (Dynamic Programming) 解法 特点: 构造一个二维 DP 数组,dp[i][j] 表示子串 s[i:j+1] 是否是回文。 状态转移方程为:如果 s[i] == s[j] 并且子串 ...
Given a string containing just the characters'('and')', find the length of the longest valid (well-formed) parentheses substring. Example 1: Input: "(()" Output: 2 Explanation: The longest valid parentheses substring is"()" Example 2: Input: ")()())" Output: 4 Explanation: The longe...
解法解释 基本情况处理:如果输入的字符串s的长度小于2,那么它自己就是最长的回文子串,因为一个字符或空字符串自然是回文的。 初始化动态规划表:创建一个二维数组dp,其中dp[i][j]用来表示字符串从位置i到位置j(包含j)的子串是否是回文串。初始时,我们假设所有的子串都不是回文的(False),但是每个单独的字符自己...
41. Longest Valid Parentheses 最长有效括号算法:本题用两种方法解,一是stack,二是双向遍历面试准备系列,注重培养互联网大厂的面试能力,注重编程思路,coding限时,代码规范,想要求职,转行或者跳槽的朋友们别忘了一键三连一下,新人up主需要你宝贵的支持哟~
Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000. Example: Input: "babad" Output: "bab" Note: "aba" is also a valid answer. 二、解决思路 思路一:暴力法,先求出字符串的全部子字符串,然后对每个子字符串进行判断,O(n^3...
题目地址:https://leetcode.com/problems/longest-substring-without-repeating-characters/description/ 题目描述 Given a string, find the length of thelongest substringwithout repeating characters. Example 1: Input: "abcabcbb" Output: 3 Explanation: The answer is "abc", which the length is 3. ...
stack.empty()&&stack.peek()=='('){stack.pop();}else{returnfalse;}}returnstack.empty();}publicintlongestValidParentheses(Strings){intmaxlen=0;for(inti=0;i<s.length();i++){for(intj=i+2;j<=s.length();j+=2){if(isValid(s.substring(i,j))){maxlen=Math.max(maxlen,j-i);}}}...
Longest Substring Without Repeating Characters: Given a string, find the length of the longest substring without repeating characters. 无重复字符的最长子串: 给定一个字符串,请你找出其中不含有重复字符的 最长子串 的长度。 Example 1: Input: "abcabcbb" ...
题目描述 题解 题解 提交记录 提交记录 代码 9 1 2 3 › "abcd" "abbaba" "aabcaabdaab" Source 该题目是 Plus 会员专享题 感谢使用力扣!您需要升级为 Plus 会员来解锁该题目 升级Plus 会员