摘要： Problem Description There are two strings A and B with equal length. Both strings are made up of lower case letters. Now you have a powerful string pa 阅读全文

摘要： Problem Description In mathematics, a subsequence is a sequence that can be derived from another sequence by deleting some elements without changing t 阅读全文

摘要： Problem Description Long long ago, there lived two rabbits Tom and Jerry in the forest. On a sunny afternoon, they planned to play a game with some st 阅读全文