And the way I remember that is I put a little cross here, and then I make that the plus end.
我还记得要,在箭头尾部打个叉,然后让加法完结了。
So I simply print, highlight, and give a big "X" and a zero.
我会简单地打印一下,标记出来,然后打一大把叉,给个零分。
Now, the decision tree, if I branch left, it's a binary tree.
现在,这个决策树,如果我走左边的分支,这是一棵二叉树。
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