摘要：
There are n pictures delivered for the new exhibition. The i-th painting has beauty ai. We know that a visitor becomes happy every time he passes from 阅读全文
摘要：
这道题想了小半天，后来经过大神指点后思路终于通了。 Hello everyone ,welcome to our programming match. This is your first task!!An organic compound is any member of a large clas 阅读全文