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描述 There has been considerable archeological work on the ancient Myacm culture. Many artifacts have been found in what have been called power fields: 阅读全文
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描述 We all know that a pair of distinct points on a plane defines a line and that a pair of lines on a plane will intersect in one of three ways: 1) no 阅读全文
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描述 Given a connected undirected graph, tell if its minimum spanning tree is unique.Definition 1 (Spanning Tree): Consider a connected, undirected grap 阅读全文
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描述 In an edge-weighted tree, the xor-length of a path pis defined as the xor sum of the weights of edges on p: ⊕ is the xor operator. We say a path th 阅读全文