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.

Sort Elements by frequency

Sort Elements by frequency

Given an array, Sort the array according to the frequency of the elements Example INPUT: arr = {1,1,3,3,3,6,6,6,6} OUTPUT: {6,6,6,6,3,3,3,1,1} Time Complexity: O(nlogn) In this method the main idea is to...
Stock Buy Sell to Maximize Profit

Stock Buy Sell to Maximize Profit

Given an array which contains stock price on each day, find the maximum profit that you can make by buying and selling in those...
Merge Overlapping Intervals

Merge Overlapping Intervals

Given a set of intervals, this function will merge the overlapping intervals into one and prints all the non overlapping intervals Example INPUT: arr = {{1,6},{3,9},{11,13},{2,5}} OUTPUT: After merging...
Maximum Subarray Sum using Divide and Conquer

Maximum Subarray Sum using Divide and Conquer

Given an array of both positive and negative integers, this function will find the largest sum of contiguous subarray. Example INPUT: arr = {3, -4, 6, 2,...
Pancake sorting Problem

Pancake sorting Problem

This problem is based on pancake sorting. Given an unsorted array, we need to write a function which uses only flip operation to sort the...
Pancake sorting

Pancake sorting

Given an unsorted array, this function uses only flip operation to sort the array. flip is the operation which reverses the array. Example INPUT: arr = {4,...
Arrange given numbers to form the biggest number

Arrange given numbers to form the biggest number

Given an array of positive integers, this function will arrange them in such way that the arrangement will form the largest value. Example INPUT: arr = {3,...
Iterative Implementation of quick sort

Iterative Implementation of quick sort

Given an array, this function will sort the array using quick sort. Here, quick sort is not implemented recursively, it is implemented in iterative...
Shuffle a given array

Shuffle a given array

Given an array of integers, this function will shuffle the given array. That is, it will shuffle the elements in the array randomly. Example INPUT: arr =...
Find the row with maximum number of 1's

Find the row with maximum number of 1’s

Given a matrix(2D array) containing binary digits with each row sorted, this function will find the row which as maximum number of 1's . Example INPUT: 0...

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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...