'Coding has over 700 languages', '67% of programming jobs aren’t in the technology industry', 'Coding is behind almost everything that is powered by electricity'
Dunzo interview experience Real time questions & tips from candidates to crack your interview
SDE - 2
Dunzo
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4 rounds | 7 Coding problems
Interview preparation journey
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Preparation
Duration: 1 month
Topics: Data structures and algorithms, Databases, Design patterns, System design.
Tip
Tip

Tip 1 : Do some basic research about the interview process and types of rounds while appearing for a company interview. Narrow down the topics and draft a realistic plan afterwards.
Tip 2 : Try to solve as many problems as possible topic wise.
Tip 3 : Please cover the breadth of topics first to get an early estimate of strong and weak topics.

Application process
Where: Linkedin
Eligibility: Prior experience as SDE
Resume Tip
Resume tip

Tip 1 : Tailor your resume as per expectations from the role you are applying for.
Tip 2 : Order your experiences and skills by relevance.
Tip 3 : Try to fit the content in a single page.

Interview rounds
01
Round
Medium
Online Coding Interview
Duration60 minutes
Interview date12 May 2019
Coding problem1
1. Container with most water
Moderate
15m average time
90% success
0/80
Asked in companies
SAP LabsAmazonFlipkart
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02
Round
Easy
Face to Face
Duration45 minutes
Interview date12 May 2019
Coding problem2
1. Anagram Substring Search
Moderate
35m average time
70% success
0/80
Asked in companies
DunzoDelhiveryZS Associates

Given two strings ‘STR’ and ‘PTR’. Find all the starting indices of ‘PTR’ anagram substring in ‘STR’. Two strings are anagram if and only if one string can be converted into another s...

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2. Maximum size rectangle binary sub-matrix with all 1s
Hard
10m average time
80% success
0/120
Asked in companies
American ExpressRazorpayCisco

You are given an 'N' * 'M' sized binary-valued matrix 'MAT, where 'N' is the number of row...

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03
Round
Medium
Face to Face
Duration60 minutes
Interview date12 May 2019
Coding problem2
1. Number of Subsequences with Even and Odd Sum
Moderate
25m average time
60% success
0/80
Asked in companies
DunzoAdobeOla

You are given an array consisting of 'N' positive integers, and your task is to find the number of subsequences with odd sum and the numb...

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Problem approach

1. Brute force approach is to check all subsequences in O(2^N)
2. Suggested on dynamic programming based approach - maintain 2 arrays odd and even which stores number of odd subsequences and num of even subsequences respectively till index i.
3. Logic to get ith value: if ith element is odd, ith value of odd array is sum of i-1 th value of odd array, i-1 th value of even array and 1. Simi...

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2. Minimum cost of reducing Array by merging any adjacent elements repetitively
Hard
15m average time
80% success
0/120
Asked in companies
DunzoZS AssociatesGrab
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04
Round
Medium
Face to Face
Duration60
Interview date12 May 2019
Coding problem2
1. Next Greater Element
Moderate
20m average time
90% success
0/80
Asked in companies
ZS AssociatesPhone PeFlipkart

You are given an array arr of length N. You have to return a list of integers cont...

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Problem approach

1. Analysed the problem and clarified the assumption with input sizes and data types
2. Found out the given problem was a variation of next greater element (link above)
3. Used stack data structure to solve it in O(N) time.

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2. System Design And OS Questions

Design a least frequently used cache. (Practice)
1. Specify data structures, read/write method logic
2. Handle concurrency and failure scenarios
3. High level system design discussion

Problem approach

Tip 1: Revise general distributed system concepts thoroughly.
Tip 2: Practice as many design problems as possible with time constraints. Try to discuss approaches with friends.
Tip 3: Clarify as many doubts and assumptions as possible wit h the interviewer before jumping to the solution.
Tip 4: While solving low level design problems, do consider concurrency scenarios and failure scena...

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