问题描述:求括号字符串中最长合法子串长度.例如:()((),返回2,而不是4. 算法分析:还是利用栈,和判断合法括号对是一样的. public static int longestValidParentheses(String s) { Stack<int[]> stack = new Stack<int[]>(); int result = 0; for(int i=0; i<=s.length()-1; i++) { char c = s.charAt(i); if(c=…
Given a string, find the length of the longest substring T that contains at most 2 distinct characters. For example, Given s = "eceba", T is "ece" which its length is 3. 给一个字符串,求这个字符串中,由两个字母组成的,连续的最长子串的长度. 虽然是hard,但是感觉并没有什么难度. 用ch1和pre…
题目: Given a . For . 解题思路: 这个题让找一个字符串中具有不重复单词的最长子串的长度,如:ababc,子串为abc,长度为3.有这么几个方法: 方法一: 依赖字符串本身的一些特有函数,进行相应操作来完成.我们可以维护一个子串,来保存最长的无重复的子串,并记录当前子串的长度,如果遇到重复的字符,则去掉子串中重复的字符,一次进行下去,最终就能找到最长无重复子串.如str = ababc, substr = a, ab, ba, ab, abc....类似这样的思路.如下代码: /…
Common Subsequence Problem Description A subsequence of a given sequence is the given sequence with some elements (possible none) left out. Given a sequence X = <x1, x2, ..., xm> another sequence Z = <z1, z2, ..., zk> is a subsequence of X if…
