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Description The 15 puzzle has been around for over 100 years; even if you don't know it by that name, you've seen it. It is constructed with 15 slidin 阅读全文
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Description You are given a tree, it’s root is p, and the node is numbered from 1 to n. Now define f(i) as the number of nodes whose number is less th 阅读全文
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Description There is an apple tree outside of kaka's house. Every autumn, a lot of apples will grow in the tree. Kaka likes apple very much, so he has 阅读全文
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Description After going through the receipts from your car trip through Europe this summer, you realised that the gas prices varied between the cities 阅读全文