摘要：
The last contest held on Johnny's favorite competitive programming platform has been received rather positively. However, Johnny's rating has dropped 阅读全文
摘要：
Among Johnny's numerous hobbies, there are two seemingly harmless ones: applying bitwise operations and sneaking into his dad's office. As it is usual 阅读全文
摘要：
Johnny has recently found an ancient, broken computer. The machine has only one register, which allows one to put in there one variable. Then in one o 阅读全文