摘要：
http://acm.hdu.edu.cn/showproblem.php?pid=1247Problem DescriptionA hat’s word is a word in the dictionary that is the concatenation of exactly two other words in the dictionary.You are to find all the hat’s words in a dictionary.InputStandard input consists of a number of lowercase words, one per li 阅读全文
摘要：
http://acm.hdu.edu.cn/showproblem.php?pid=1671Problem DescriptionGiven a list of phone numbers, determine if it is consistent in the sense that no number is the prefix of another. Let’s say the phone catalogue listed these numbers:1. Emergency 9112. Alice 97 625 9993. Bob 91 12 54 26In this case, it 阅读全文