摘要：
DescriptionUnit Fraction is a special fraction.For example,1/2 , 1/3 and so on are Unit Fractions, as their numerator is 1 and denominator is the positive integer greater than 1.The ancient Greeks worship this type fraction.They think that everything in the world can be measured by the Unit Fraction 阅读全文
摘要：
Problem descriptionThe best friends Mr. Li and Mr. Liu are touring in beautiful country M.M has n cities and m two-way roads in total. Each road connects two cities with fixed length.We assume that the cost of car traveling on the road is only related to the length of road,the longer road the more m 阅读全文