摘要：
Max Sum Given a sequence a[1],a[2],a[3]......a[n], your job is to calculate the max sum of a sub sequence. For example, given (6, 1,5,4, 7), the max s 阅读全文
摘要：
A Diverse Strings A string is called diverse if it contains consecutive (adjacent) letters of the Latin alphabet and each letter occurs exactly once. 阅读全文