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Update 仙人掌.md
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新增仙人掌介绍
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CurryWOE authored Oct 30, 2023
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# 仙人掌(cactus)
定义:无向连通图,每条边最多在一个环上

仙人掌图中每个环相当于一个点双

环上两点之间距离只有两种可能,重构成圆方树之后可以保留距离信息

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