摘要：
Median is the middle value in an ordered integer list. If the size of the list is even, there is no middle value. So the median is the mean of the two 阅读全文
摘要：
Given a list of directory info including directory path, and all the files with contents in this directory, you need to find out all the groups of dup 阅读全文
摘要：
Two strings X and Y are similar if we can swap two letters (in different positions) of X, so that it equals Y. For example, "tars" and "rats" are simi 阅读全文