摘要：
Find the maximumProblem DescriptionEuler's Totient function, φ (n) [sometimes called the phi function], is used to determine the number of numbers les... 阅读全文
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DaveProblem DescriptionRecently, Dave is boring, so he often walks around. He finds that some places are too crowded, for example, the ground. He coul... 阅读全文
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To Miss Our Children TimeProblem DescriptionDo you remember our children time? When we are children, we are interesting in almost everything around ou... 阅读全文
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The Frog's GamesProblem DescriptionThe annual Games in frogs' kingdom started again. The most famous game is the Ironfrog Triathlon. One test in the I... 阅读全文
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The kth great numberProblem DescriptionXiao Ming and Xiao Bao are playing a simple Numbers game. In a round Xiao Ming can choose to write down a numbe... 阅读全文