[理工] Binary tree

楼主: nO25948 (chenyuyan)   2017-12-28 00:15:34
https://i.imgur.com/GxI0Edb.jpg
想问一下第二小题的root is larger than one
该怎么排列组合
答案是134
先谢谢各位大大
作者: gary70812 (1)   2017-12-28 00:36:00
C(12,6)/7+C(4,2)/3
作者: ccoqprp15634 (AirBo)   2017-12-28 00:37:00
The height of left-subtree of root 要一起翻,题意为左子树是full binary tree 并且高度大于1
楼主: nO25948 (chenyuyan)   2017-12-28 00:58:00
我懂了,谢谢两位大大
作者: s06i06 (三条鱼)   2017-12-28 13:08:00
请问一下 这三题答案给什么 感谢!
作者: b10007034 (Warren)   2017-12-28 16:04:00
对个答案,A,1/6*(10,5)B,1/7*(12,6)+1/3*(4,2)C,1/4*(6,3)*1/7*(12,6)

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