摘要：
http://acm.hdu.edu.cn/showproblem.php?pid=1301Problem DescriptionThe Head Elder of the tropical island of Lagrishan has a problem. A burst of foreign aid money was spent on extra roads between villages some years ago. But the jungle overtakes roads relentlessly, so the large road network is too expe 阅读全文
摘要：
http://acm.hdu.edu.cn/showproblem.php?pid=1217Problem DescriptionArbitrage is the use of discrepancies in currency exchange rates to transform one unit of a currency into more than one unit of the same currency. For example, suppose that 1 US Dollar buys 0.5 British pound, 1 British pound buys 10.0 阅读全文