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In general, the node content in a threaded binary tree is ________

(a) leftchild_pointer, left_tag, data, right_tag, rightchild_pointer

(b) leftchild_pointer, left_tag

(c) leftchild_pointer, left_tag, right_tag, rightchild_pointer

(d) leftchild_pointer, left_tag, data

Question is taken from Threaded Binary Tree in portion Binary Trees of Data Structures & Algorithms I

This question was addressed to me in homework.

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Best answer
The correct answer is (a) leftchild_pointer, left_tag, data, right_tag, rightchild_pointer

Easiest explanation - It contains additional 2 pointers over normal binary tree node structure.

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