摘要：
题目： Homer: Marge, I just figured out a way to discover some of the talents we weren’t aware we had. Marge: Yeah, what is it? Homer: Take me for exampl 阅读全文
摘要：
题目： For each prefix of a given string S with N characters (each character has an ASCII code between 97 and 126, inclusive), we want to know whether th 阅读全文