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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.

Arrange Even and Odd number such that Odd comes after Even

Arrange Even and Odd number such that Odd comes after Even

Segregate even and odd number such that even numbers occur first and then odd numbers. Arrange Even numbers in First Half and Odd numbers in...
Minimum number of Merge Operations to make an Array Palindrome

Minimum number of Merge Operations to make an Array Palindrome

Given an array of positive integers, write a program to find minimum number of merge operations required to make the array palindrome If it is...
Form minimum number from given sequence of D's and I's

Form minimum number from given sequence of D’s and I’s

When given a pattern containing D's and I's, D for decreasing and I for increasing. This function will print minimum number from given sequence...
Longest span with same sum in two binary arrays

Longest span with same sum in two binary arrays

Given two binary arrays, array1 and array2 with same size. This function will print the longest span with the same sum in two arrays....
Find the Subarray of given length with Least Average

Find the Subarray of given length with Least Average

Given an array and an input integer X, write a program to find the subarray of length X with least/minimum average Prints the starting and...
Find Zeros to be Flipped so that number of Consecutive 1's is maximized

Find Zeros to be Flipped so that number of Consecutive 1’s is maximized

Given a binary array and number of zeros to be flipped, write a program to find the zeros that needs to be flipped so...
Merge K Sorted Arrays and Print Sorted Output

Merge K Sorted Arrays and Print Sorted Output

Given k sorted arrays of size n each, write a program to merge those arrays and prints the sorted output Example INPUT : arr = {{1,5,7},{2,4,6},{3,10,13}} OUTPUT : {1,2,3,4,5,6,10,13} Time...
Find the minimum element in a sorted and rotated array

Find the minimum element in a sorted and rotated array

Given a sorted array which is rotated at some unknown point, find the minimum element in that array Example INPUT : arr = {5,6,7,1,2,3,4} OUTPUT : The minimum element...
Find the point where a monotonically increasing function becomes positive first time

Find the point where a monotonically increasing function becomes positive first time

Given a function 'int f(unsigned int x)' which takes a non-negative integer 'x' as the input and returns the value where f() becomes positive...
Print all possible combinations of r elements in a given array of size n

Print all possible combinations of r elements in a given array of size n

Given an array of size n, find all combinations of size r in the array. Example INPUT: arr = {1,2,3,4} r = 2 OUTPUT: {1,2}, {1,3}, {1,4}, {2,3}, {2,4}, {3,4} Method...

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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...