摘要:
[toc] Description A number is called quasibinary if its decimal representation contains only digits 0 or 1. For example, numbers 0, 1, 101, 110011 — a 阅读全文
摘要:
[toc] Description Vladik and Chloe decided to determine who of them is better at math. Vladik claimed that for any positive integer $n$ he can represe 阅读全文