Array Interview Questions

I am presenting a collection of commonly asked array interview questions. Array questions are the most asked questions these days. The interviewer wants to know, how efficient code you can write. Therefore practice technical questions on arrays.

These array practice questions will help you clear the difficult programming rounds. In other words, these rounds are based on array questions. But, you should practice it frequently. For example, you can practice 2 questions daily.

Below are the collections of array questions which will help you to practice questions on arrays. Practicing daily will help you to improve your programming logic to solve any new questions you will face.

Array interview questions will help you to clear at-least the first round of the technical interviews.

When you are working on array practice questions then keep one thing in mind to first solve the array questions without seeing the solution. After that, you can match how we have solved the question.

Sorting a k sorted array

Sorting a k sorted array

k sorted array: An array in which each element is at max k away from its position in the sorted array. Given an k sorted...
Maximum product subarray

Maximum product subarray

Given an array consisting of positive, negative integers and also zeroes, this function will findĀ  the maxium product of the subarray. Example INPUT: arr = {3, -6,...
Largest subarray with equal number of 0's and 1's

Largest subarray with equal number of 0’s and 1’s

Given an array, this function will find the largest subarray with equal number of 0's and 1's and will print the start index and...
Find the two numbers with odd occurrences in an unsorted array

Find the two numbers with odd occurrences in an unsorted array

Given an unsorted array in which other than two numbers all other numbers occur even number of times. This function will find the two...
Maximum sum increasing subsequence

Maximum sum increasing subsequence

Given an array, this function will find the sum of maximum subsequence of the given array, that is the integers in the subsequence are...
Implement two stacks in an array

Implement two stacks in an array

Implementing two stacks in an array such that, if user wants to push an element in either of two stacks then their should not...
Number of smaller elements on right side

Number of smaller elements on right side

Given an array, this function will print the number of smaller elements that are on the right side of the each element Example: INPUT: arr = {4,...
Increasing subsequence of length three with maximum product

Increasing subsequence of length three with maximum product

In the given array of positive integers, find the subsequence of length 3 with maximum product Subsequence should be increasing. Example Input array: Output: This is subsequence...
Elements appear more than n_k times in array

Elements appear more than n/k times in array

In the given array of size n, find the elements which appear more than n/k times. Where k is the input value Example a) Input array:...
Find the Peak element from an array

Find the Peak element from an array

In the given input array of integers find a peak element In an array an element is a peak element, if the element is greater...

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Multiplication of two matrices

Multiplication of two matrices

Given two matrices, this function will multiply the two matrices and prints the result. Here, necessary and sufficient condition is the number of columns...
Subtraction of two matrices

Subtraction of two matrices

Given two matrices, we will write a function that subtracts the given matrices. Example INPUT A = { {1, 4, 7, 9}, {1, 6, 7, 6}, {6, 3, 7,...
Check if two given matrices are identical

Check if two given matrices are identical

Given two matrices, we will write a function to check whether the two matrices are identical or not. That is, if all the elements...