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Binary Search

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Level 8

Be a Code Ninja!

Binary search is the most efficient searching algorithm having a run-time complexity of O(log2 N) in a sorted array.

Binary search begins by comparing the middle element of the list with the target element. If the target value matches the middle element, its position in the list is returned. If it does not match, the list is divided into two halves. The first half consists of the first element to the middle element whereas the second half consists of the element next to the middle element to the last element i.e. the search interval is repeatedly divided into halves.

Let's take an example and see how binary search works and number of steps it takes as compared to linear search.


Binary Search example 


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Binary Search Problems

Simple binary search
Search answer
Problem Score Companies Time Status
Matrix Median 225 77:24
Square Root of Integer 275 40:32
Allocate Books 350 68:01
Painter's Partition Problem 350 81:38
Red Zone 400
Search step simulation
Problem Score Companies Time Status
Implement Power Function 275
Simple Queries 300
Sort modification
Problem Score Companies Time Status
Median of Array 325 87:05
Rotated Sorted Array Search 325 56:53

Additional Practice

Problem Score Companies Time Status
Capacity To Ship Packages Within B Days 200 33:18
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