# Two Sigma Interview Questions

Two Sigma Investments is a New York City-based hedge fund that uses a variety of technological methods, including artificial intelligence, machine learning, and distributed computing, for its trading strategies. The firm is run by John Overdeck and David Siegel.

It has got a 4.3* 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 Two Sigma Interview Experience for the interview. We have collected past frequently asked questions from Two Sigma Interview Experience for your reference.

Categories of Questions

## Two Sigma Array Questions

Question 1. Insert Delete GetRandom O(1) Leetcode Solution Problem Statement The Insert Delete GetRandom O(1) LeetCode Solution – “Insert Delete GetRandom O(1)” asks you to implement these four functions in O(1) time complexity. insert(val): Insert the val into the randomized set and return true if the element is initially absent in the set. It returns false when the ...

Question 2. Insert Delete GetRandom In Insert Delete GetRandom problem we need to design a data structure that supports all following operations in average O(1) time. insert(val): Inserts an item val to the set if not already present. remove(val): Removes an item val from the set if present. getRandom: Returns a random element from the current set ...

Question 3. Shuffle a given Array Problem Statement In the “Shuffle a given Array” problem we have given an array of integers. Write a program that shuffles the given array. That is, it will shuffle the elements in the array randomly. Input Format The first line containing an integer n. Second-line containing n space-separated integer Output ...

Question 4. Maximum Circular Subarray Sum Problem Statement In the maximum circular subarray sum problem, we have given an array of integers arranged in a circle, find the maximum sum of consecutive numbers in the circular array. Example Input arr[] =  {13, -17, 11, 9, -4, 12, -1} Output 40 Explanation Here, sum = 11 + ...

## Two Sigma Other Questions

Question 5. Group Anagrams LeetCode Solution Problem Statement Group Anagrams LeetCode Solution Says that – Given an array of strings strs, group the anagrams together. You can return the answer in any order. An Anagram is a word or phrase formed by rearranging the letters of a different word or phrase, typically using all the original letters exactly once. Example 1: ...

Question 6. Sliding Window Maximum LeetCode Solution Problem Statement Sliding Window Maximum LeetCode Solution Says that – You are given an array of integers nums, and there is a sliding window of size k which is moving from the very left of the array to the very right. You can only see the k numbers in the window. Each time ...

Question 7. Top K Frequent Words LeetCode Solution Problem Statement Top K Frequent Words LeetCode Solution – Given an array of strings words and an integer k, return the k most frequent strings. Return the answer sorted by the frequency from highest to lowest. Sort the words with the same frequency by their lexicographical order. Example Test Case 1: Input: words = [“i”,”love”,”leetcode”,”i”,”love”,”coding”] k = 2 Output: [“i”,”love”] Explanation ...

Question 8. Number of Provinces Leetcode Solution Problem Statement Number of Provinces Leetcode Solution – We are given an adjacency matrix representation of a graph and need to find the number of provinces. Here province is a group of directly or indirectly connected cities and no other cities outside of the group. Example Example 1: Input: isConnected ...

Question 9. Power of Four Leetcode Solution Problem Statement We are given an integer and we have to check if the number is power of 4 or not. A number is power of 4 if there exist an integer a such that,  num= 4^a. Example 16 true 5 false Approach 1 (Brute Force) An obvious way to ...

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