摘要:
A. Anton and Danik Anton likes to play chess, and so does his friend Danik. Once they have played n games in a row. For each game it's known who was t 阅读全文
摘要:
A. Grasshopper And the String One day, the Grasshopper was jumping on the lawn and found a piece of paper with a string. Grasshopper became interested 阅读全文