摘要：A - Diverse Team There are n students in a school class, the rating of the i-th student on Codehorses is ai. You have to form a team consisting of k s 阅读全文

摘要：B - Reversing Encryption A string s of length n can be encrypted by the following algorithm: iterate over all divisors of n in decreasing order (i.e. 阅读全文