To perform the standard deletion operation in a heap, 2 arrays are required.

Quick Scoop

Direct Answer

In the context of the classic theory/MCQ-style question “how many arrays are required to perform deletion operation in a heap?”, the expected answer is:

2 arrays are required to perform the deletion operation in a heap.

The usual explanation given is that, in this formulation, one array stores the heap itself, and a second temporary array (or auxiliary structure) is used during deletion, which increases extra memory usage and running time.

But don’t heaps usually use just one array?

In many practical implementations of a binary heap (like in typical priority queue implementations), deletion of the root is done in-place using a single array: swap root with last element, shrink the heap size, and heapify. That means in real-world code you often see only one underlying array.

However, exam-style questions from some data-structure MCQ sources explicitly define the deletion procedure as using 2 arrays , and you’re expected to match that convention in your answer.

Mini takeaway (for exams vs practice)

  • If you’re answering an MCQ / theory question exactly like:
    “How many arrays are required to perform deletion operation in a heap?”
    → Mark: 2 arrays.
  • If you’re coding a heap in C/C++/Java/Python today, you will almost always implement deletion using a single array representation of the heap.

TL;DR: For the question as usually asked in data-structure quizzes, the correct answer is 2 arrays are required to perform deletion operation in a heap.

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