HashedIn by Deloitte Interview Questions, Process, and Tips

We were given notepad to write pseudo code, there were 3 questions, 1 easy, 1 medium and 1 hard. We had to write time and space complexity for each question.

Q1. 4 questions were asked , 3 easy and 1 medium level , some questions of programming language and OOPS.
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Q1. 1 coding question of hard level, was somewhat similar to no. Of island , I gave dfs approach but he asked me to code using bfs. 2nd question was designing snake and ladder with N number of player and N cel...read more
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Q1. Basic HR questions , project discussion and some scenario based problems.
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Round duration - 30 minutes
Round difficulty - Easy

Interviewer had good knowledge

Q1. 
Pair Sum Problem Statement
You are provided with an array ARR consisting of N distinct integers in ascending order and an integer TARGET. Your objective is to count all the distinct pairs in ARR whose sum...read more
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Round duration - 60 minutes
Round difficulty - Hard

LLD

Q1. Can you describe the database design for a ticket booking system like BookMyShow?
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Round duration - 15 minutes
Round difficulty - Medium

Interview experience 
Salary negotiation

Round duration - 90 minutes
Round difficulty - Medium

It consists of 3 questions:

The first question was related to DP (Hard)
Second was related to math(Easy)

Third was related to string (Medium)

Q1. 
Chocolate Pickup Problem
Ninja has a 'GRID' of size 'R' x 'C'. Each cell of the grid contains some chocolates. Ninja has two friends, Alice and Bob, and he wants to collect as many chocolates as possible ...read more
Ans. 
I was able to pass only 1 test case out of 5
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Q2. 
Trailing Zeros in Factorial Problem
Find the number of trailing zeroes in the factorial of a given number N.
Input:
The first line contains an integer T representing the number of test cases.
Each of the...read more
Ans. 
I was able to pass only 3 test case out of 5
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Q3. 
Find K'th Character of Decrypted String
You are given an encrypted string where repeated substrings are represented by the substring followed by its count. Your task is to find the K'th character of the d...read more
Ans. 
I was able to pass all test cases
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Round duration - 45 minutes
Round difficulty - Medium

Standard DS/Algo round. It was at around 12 PM

Q1. 
Leaders in an Array Problem Statement
Given a sequence of numbers, the task is to identify all the leaders within this sequence. An element is considered a leader if it is strictly greater than all the el...read more
Ans. 
Start the iteration from the right side and keep the track of the maximum array till that particular element of the array.
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Q2. 
Find Two Missing Numbers Problem Statement
Given an array of unique integers where each element is in the range [1, N], and the size of the array is (N - 2), there are two numbers missing from this array....read more
Ans. 
First I solved this question in O(n) space and O(n) time then they asked me to optimize it and solve it without extra space.
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Q3. 
Reverse the Linked List
Given a singly linked list of integers, your task is to return the head of the reversed linked list.
Input:
The first line of input contains an integer 'T' representing the numbe...read more
Ans. Brute Force
The brute force approach is to use recursion. First, we reach the end of the Linked List recursively and at last node, we return the last node, which becomes the new head of the partially reversed Linked List. While coming back from each recursion call we add the current node in the current recursion call to the last node of the partially reversed Linked List and assign the current node to null.
 
Steps:
&...read more
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Round duration - 35 minutes
Round difficulty - Easy

First, he asked me to introduce myself.
Then, he told me that as you know this is a design round so design a music player like Spotify. 
First, I have designed the database using tables and Primary and Foreign Keys.
Then, he told me to write the code for it and told me that before I write the code tell me that which data structure will you use and why?
Then, he discussed with me for around 10 to 15 min that why am I using particular DS and why not someone else and what will be the problem in a particular data structure, and how will certain DS perform in case of various operations like searching, adding, deleting the songs in the music player.
Then, he told me to write the code for a playlist of this music player with all possible operations.

Q1. Design a music player similar to Spotify.
Ans. 
Tip 1 : First design the database and show them the database schema
Tip 2 : Then share your approach and data structures which you'll use
 
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Round duration - 30 minutes
Round difficulty - Easy

Interviewer was very friendly
And, timing was around 12.30 PM

Q1. Why should we hire you?
Ans. 
Tip 1 : The cross-questioning can go intense sometimes, think before you speak.

Tip 2 : Be open-minded and answer whatever you are thinking, in these rounds, I feel it is important to have an opinion.
 
Tip 3 : Context of questions can be switched, pay attention to the details. It is okay to ask questions in these rounds, like what are the projects currently the company is investing in, which team you are mentoring, ...read more
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Q2. What do you know about the company?
Ans. 
General Tip : Before an interview for any company, have a brief insight about the company, what it does, when was it founded and so on. All these info can be easily acquired from the Company Website itself.
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Topics - There were three question, 1- easy, 2-medium
Medium level questions were from dynamic programming

Q1. Basic question were asked from the topics of OS, OOP, Database and Networking. 1 DSA question was asked.
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Q1. Low level system design question was given. Design a database for a online cab booking company.
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Q1. Basic HR questions.
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Q1. Git , docker , kubernetes, terraform
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Q1. Scenario based question in devops
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