Dunzo Software Development Engineer Interview Questions and Answers

Round duration - 50 minutes
Round difficulty - Easy

Mcq Questions

Round duration - 10 Minutes
Round difficulty - Easy

It was very difficult they go in depth of everything

Q1. 
Binary Tree to BST Transformation Task
Given a binary tree consisting of 'N' nodes with distinct integer values, transform it into a Binary Search Tree (BST) while maintaining the original structure of th...read more
Ans. 
Transform a binary tree into a Binary Search Tree (BST) while maintaining the original structure.
• Implement a function to transform the binary tree into a BST by rearranging the nodes based on BST rules.

• Maintain the original structure of the binary tree while converting it into a BST.

• Ensure that nodes in the left subtree hold values less than the node's value, and nodes in the right subtree hold values greater than the ...read more
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Q1. Map and sorting. Based
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Q2. Quick sort , and other sorting algo
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Q1. Push notifications
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Q2. DATA STRUCTURE with js
Ans. 
Data structures are used to store and organize data in a computer so that it can be accessed and manipulated efficiently.
• Data structures in JavaScript include arrays, objects, sets, and maps.

• Arrays are used to store a collection of elements, accessed by index.

• Objects are used to store key-value pairs.

• Sets are used to store unique values.

• Maps are used to store key-value pairs with keys of any type.
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Q1. Timer in react native
Ans. 
In React Native, timers can be implemented using the setTimeout and setInterval functions.
• Use setTimeout for a one-time delay before executing a function.

• Use setInterval for executing a function repeatedly at a specified interval.

• Remember to clear the timer using clearTimeout or clearInterval when no longer needed.
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Q2. Find occurance of elements in array
Ans. 
Count occurrences of elements in an array of strings
• Iterate through the array and use a hashmap to store the count of each element

• Use a for loop to go through each element and increment the count in the hashmap

• Return the hashmap with element counts
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Q1. It was through bar raiser team where I got asked 2 DSA questions. 1. Remove same adjacent character in a string and output the resulting string a. Input : abbabc Output : bc 2. LRU cache
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Q1. It was Taken by a senior VP of the company which felt like a rapid fire round to be honest but in a good way It was based on spring boot and java(included in my resume) and proper questions about developme...read more
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Q1. Tell me about yourself.
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Duration: 1 hour
Platform: Hackerrank
Topics : Standard Interview Problems

Q1. SQL based, Puzzle based
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Easy and medium level questions on array linked list

Q1. Create a controller , service and repository methods and classes to save userDeatils in table using Spring Data JPA .
Ans. 
Create a controller, service, and repository to save user details using Spring Data JPA.
• Create a UserController class with appropriate mappings for saving user details.

• Create a UserService class with a method to save user details.

• Create a UserRepository interface that extends JpaRepository to handle database operations.

• Implement the saveUserDetails method in the UserService class to call the save method of the UserRepo...read more
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