摘要：题目： Given a string containing just the characters '(' and ')', find the length of the longest valid (well-formed) parentheses substring.For "(()", the 阅读全文

摘要：原题： The count-and-say sequence is the sequence of integers beginning as follows: 1, 11, 21, 1211, 111221, ... 1 is read off as "one 1" or 11.11 is rea 阅读全文

摘要：题目描述： 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 阅读全文