摘要：
Description Raju and Meena love to play with Marbles. They have got a lot of marbles with numbers written on them. At the beginning, Raju would place 阅读全文
摘要：
Misha hacked the Codeforces site. Then he decided to let all the users change their handles. A user can now change his handle any number of times. But 阅读全文