摘要：
You have a list of words and a pattern, and you want to know which words in words matches the pattern. A word matches the pattern if there exists a pe 阅读全文
摘要：
To some string S, we will perform some replacement operations that replace groups of letters with new ones (not necessarily the same size). Each repla 阅读全文
摘要：
We are given two strings, A and B. A shift on A consists of taking string A and moving the leftmost character to the rightmost position. For example, 阅读全文