Traversing a binary tree in preorder is equivalent to
Traversing a binary tree in preorder is equivalent to
A．Traversing the forest corresponding to the binary tree in root-first order.
B．Traversing the forest corresponding to the binary tree in root-last order.
C．Traversing the forest corresponding to the binary tree in breadth-first order.
D．None of the abovE.
正确答案：A
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