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.

Find the first and second smallest elements

Find the first and second smallest elements

Given an array of integers. Find the first and second smallest integers from an array. OR Find two smallest numbers from an array INPUT: 7, 6, 8,...
Find the number occuring odd number of times in an array

Find the number occuring odd number of times in an array

Given an array of positive integers. All numbers occur even number of times except one number which occurs odd number of times We have to...
Sort elements by frequency of occurrences

Sort elements by frequency of occurrences

Sort array elements in such a way that the element with the highest number of occurences comes first. If the number of occurences are...
Find the missing number from Array of 1 to N numbers

Find the missing number from Array of 1 to N numbers

One number is missing from an array of numbers from 1 to N. Find the missing number. Method 1 TIME COMPLEXITY: O(N) SPACE COMPLEXITY: O(1) We use Simple...
Find nearest greater and smaller element from an unsorted array (Floor and Ceil)

Find nearest greater and smaller element from an unsorted array (Floor and Ceil)

Find just greater and smaller element than number x from an unsorted array (Floor and Ceil) Given an array, you have to find two numbers...
Sub Array With Maximum Sum

Sub Array with Maximum Sum – Kadane Algorithm

This is one of the mostly asked question during interviews. Here interviewer loves to see linear algorithmic approach of yours. Yes you can find...
Reverse an Array

Write a program to Reverse an Array

Array is the sequential collection of similar elements. Array is a fixed size data structure. Arrays can be accessed by index which starts from...

Find a triplet in array whose sum is equal to zero or given number

Given an array of integers (positive and negative numbers) and you have to find a triplet (3 elements) in array whose sum is equal...
Find elements pair from array whose sum equal to number

Find elements pair from array whose sum equal to number

Write a program to find a pair sum in array equal to given input number. Pair sum equal to a given number Time Complexity: O(NlogN) Space Complexity: O(1) Concept: Let say...

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Multiplication of two matrices

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Subtraction of two matrices

Subtraction of two matrices

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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...