Search Algorithms – Binary, Binary Tree, and Linear Search (AQA A-Level Computer Science): Quizzes

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Search Algorithms – Binary, Binary Tree, and Linear Search
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What order does linear search examine items in a dataset?

Sequentially from beginning to end

On average, how much of a dataset does linear search check before finding an item?

Approximately half the items

What is the time complexity of linear search using Big O notation?

O(n)O(n)

What critical requirement must be met for binary search to work?

Data must be sorted in order

What is the maximum number of comparisons binary search needs for 1 million records?

20 comparisons

How is MiddlePointer calculated in binary search?

(LowestPointer+HighestPointer)/2(\text{LowestPointer} + \text{HighestPointer}) / 2

What is the time complexity of binary search?

O(logn)O(\log n)

In binary tree search, when do you move to the left child node?

When search value < current node value

When is linear search most appropriate to use?

Small, unsorted datasets

Which two factors primarily determine the choice of search algorithm?

Data amount and organization

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