摘要：Java中String、StringBuffer、StringBuilder的比较与源代码分析 众所周知String、StringBuffer、StringBuilder是java中常用的字符串类，下面我将从三个方面对他们三兄弟进行对比。 一、三者的数据组织及其功能实现 大家爱把String、Str 阅读全文

摘要：Given a string, you are supposed to output the length of the longest symmetric sub-string. For example, given Is PAT&TAP symmetric?, the longest symme 阅读全文

摘要：Zhejiang University has 40000 students and provides 2500 courses. Now given the student name lists of all the courses, you are supposed to output the 阅读全文