On the last contest, 998kover became THE FIRST LGM in Kazakhstan. Congratulations!

I was scrolling in CF, and I noticed one account, which had more rating than top 10, but he wasn't is top. Apparently, it turns out that jqdai0815 retired and changed his nickname. Why?

What kind of unique users do you know?

I think there are a lot of unique accounts like knatwila or Webbly. Some may have crazy ratings like jqdai0815, XCPCLoser_Messywind or vjudge36. If you would not mind, write them below in comments, and in the future I will make list of them

Theoretically, How much rating would Tourist lose, if he placed the last of the contest?

Dear CF community, why this solution gives TLE, while this solution normally passes the tests?

Is there anything wrong with using "const int N"?

Is sorting algorithm in C++ library enough? What are the advantages of bubble sorting, merge sorting, or quick sorting? Do you need to know them for example for the national olympiad?

The bells are jingling. The balls are rolling. The stars shine bright on the Christmas tree. May this sparkle always brighten your life!