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The graph is called tree if it is connected and has no cycles. Suppose the tree is rooted at some vertex. Then tree is called to be perfect k k -ary t 阅读全文
posted @ 2018-11-28 20:55
nimphy
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摘要：
One of Arkady's friends works at a huge radio telescope. A few decades ago the telescope has sent a signal s s towards a faraway galaxy. Recently they 阅读全文
posted @ 2018-11-28 10:24
nimphy
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