摘要： Sasha and Kolya decided to get drunk with Coke, again. This time they have k types of Coke. i-th type is characterised by its carbon dioxide concentra 阅读全文

摘要： It's New Year's Eve soon, so Ivan decided it's high time he started setting the table. Ivan has bought two cakes and cut them into pieces: the first c 阅读全文

摘要： Bob programmed a robot to navigate through a 2d maze. The maze has some obstacles. Empty cells are denoted by the character '.', where obstacles are d 阅读全文