**HackerRank** is a tech company^{} that focuses on competitive programming challenges for both consumers and businesses. Developers compete by writing programs according to provided specifications.^{}^{} HackerRank’s programming challenges can be solved in a variety of programming languages (including Java, C++, PHP, Python, SQL, JavaScript) and span multiple computer science domains.

It has got a 4.1* rating on Glassdoor and is considered one of the best product-based companies. It is highly regarded for its work-life balance.

They provide good training as well which will be beneficial in future too. You can practice the below questions collected from **HackerRank** Interview Experience for the interview. We have collected past frequently asked questions from **HackerRank** Interview Experience for your reference.

Categories of Questions

## HackerRank Array Questions

**Question 1. Check if a given array contains duplicate elements within k distance from each other** The problem “Check if a given array contains duplicate elements within k distance from each other” states that we have to check for duplicates in given unordered array within the range of k. Here the value of k is smaller than the given array. Examples K = 3 arr[] = ...

**Question 2. Maximum product of an increasing subsequence** Problem Statement The problem “Maximum product of an increasing subsequence” states that you are given an array of integers. Now you need to find out the maximum product you can achieve such that you multiply the elements of an increasing subsequence. The thing to note is that, we are not ...

**Question 3. Print modified array after executing the commands of addition and subtraction** You are given an array of size n, initially all the values in the array will be 0, and the queries. Each query contains the four values, type of the query T, left point of the range, the right point of a range and a number k, you have to ...

**Question 4. Count subarrays where second highest lie before highest** Problem Statement The problem “Count subarrays where second highest lie before highest” states that you are given an array a[ ] of size n where n is greater than or equal to 2. Count the total number of subarrays in which the index of highest element of the subarray is ...

## HackerRank Stack Questions

**Question 5. Count subarrays where second highest lie before highest** Problem Statement The problem “Count subarrays where second highest lie before highest” states that you are given an array a[ ] of size n where n is greater than or equal to 2. Count the total number of subarrays in which the index of highest element of the subarray is ...

## HackerRank Other Questions

**Question 6. Newman–Shanks–Williams prime** Problem Statement A Newman–Shanks–Williams prime (NSW prime) is nothing but a prime number which can be represented in a specific form given the following formula: So we need to find nth NSW prime. Example n = 3 7 Explanation S0 = 1, S1 = 1, S2 = 2*S1 + S0 ...

**Question 7. Binomial Coefficient** Problem Statement Find the Binomial Coefficient for a given value of n and k. “In mathematics, the binomial coefficients are the positive integers that occur as coefficients in the binomial theorem. Commonly, a binomial coefficient is indexed by a pair of integers n ≥ k ≥ 0 and is written as ” – quoted from Wikipedia. Example n = 5, k ...