圖論習題2

繼續上次學習i: 1.15 ： 不一定正確。可以是多個圈的並，如果連通，則正確！ 圖論圈的標準定義： a cycle in a graph is a non-empty trail in which the only repeated vertices are the first and last vertices. 可進一步思考：A graph whose vertices all have d

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