'Coding has over 700 languages', '67% of programming jobs arenâ€™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
4 rounds | 7 Coding problems
Interview preparation journey
Preparation
Duration: 1 month
Topics: Data structures and algorithms, Databases, Design patterns, System design.
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
Eligibility: Prior experience as SDE
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
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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

#### Given two strings â€˜STRâ€™ and â€˜PTRâ€™. Find all the starting indices of â€˜PTRâ€™ anagram substring in â€˜STRâ€™. 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

#### 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

#### 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
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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

#### 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.

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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