北叶青藤

摘要： Word Pattern | Given a pattern and a string str, find if str follows the same pattern. Examples: Notes: solution: Split the string, and add the pair t 阅读全文

摘要： Given a string, we can "shift" each of its letter to its successive letter, for example: "abc" -> "bcd". We can keep "shifting" which forms the sequen 阅读全文