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Competitive Programming - Crack Your Coding Interview, C++

Implementation of Binary Search

Understand how to implement the recursive binary search algorithm on sorted arrays using a divide and conquer approach. This lesson walks you through its logic, code structure, and the time-space complexity, enabling you to apply binary search confidently in coding interviews and challenges.

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Binary Search implementation

There can be two ways to implement Binary Search: recursive and iterative.

We will look at the recursive approach first. In this, we basically ignore half of the elements after just one comparison.

  • Compare the key with the middle element.
  • If the key matches with the middle element, return the mid index.
  • Else if the key is greater than the mid element, then the key can only lie in the right half
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