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What is the priority of a null node?

(a) 1

(b) 0

(c) random number

(d) infinity

My doubt is from Binary Trees in division Binary Trees of Data Structures & Algorithms I

I got this question in an online quiz.

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The correct answer is (d) infinity

Easiest explanation - The priority of a null node is set to be infinity in a treap so that during deletion, priority of that particular node is set to infinity, rotated and freed.

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