摘要：
Longest Substring Without Repeating Characters:Given a string, find the length of the longest substring without repeating characters. For example, the longest substring without repeating letters for "... 阅读全文
摘要：
Longest Palindromic Substring: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 longest palindromic substr... 阅读全文