摘要：
Problem DescriptionIgnatius is so lucky that he met a Martian yesterday. But he didn't know the language the Martians use. The Martian... 阅读全文
摘要：
Problem DescriptionArbitrage is the use of discrepancies in currency exchange rates to transform one unit of a currency into more than... 阅读全文
摘要：
Problem DescriptionContest time again! How excited it is to see balloons floating around. But to tell you a secret, the judges' favori... 阅读全文