推 pacifistboy:多的一個就是root吧，不就是按照定義寫嗎 140.119.196.80 07/11
In the tree data model,the degree of a node is
the number of chilidren that node has.Prove by structural
induction that in any tree T, the number of nodes is 1 more
than the sum of the degrees of the nodes
這個...整個沒頭緒...
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