素履之往

摘要： Problem Definition:Given n non-negative integers a1, a2, ..., an, where each represents a point at coordinate (i, ai).n vertical lines are drawn such ... 阅读全文

摘要： Problem Definition: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... 阅读全文

摘要： Problem Definition:Given a string, find the length of the longest substring without repeating characters. For example, the longest substring withoutre... 阅读全文