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Problem DescriptionBecause of the huge population of China, public transportation is very important. Bus is an important transportation method in trad... 阅读全文
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Problem Description One day, Tom traveled to a country named BGM. BGM is a small country, but there are N (N #include#include#include#include#inc... 阅读全文
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Problem DescriptionXX星球有很多城市,每个城市之间有一条或多条飞行通道,但是并不是所有的路都是很安全的,每一条路有一个安全系数s,s是在 0 和 1 间的实数(包括0,1),一条从u 到 v 的通道P 的安全度为Safe(P) = s(e1)*s(e2)…*s(ek) e1,e2... 阅读全文