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Coding Ninjas Software Developer Interview Questions and Answers
Coding Ninjas Software Developer Interview Experiences
2 interviews found
Anonymous
I applied via Referral and was interviewed in Jul 2024. There were 3 interview rounds.
(2 Questions)
- Q1. About Myself in details
- Q2. Past internships and work experiences
(2 Questions)
- Q1. Primary keys, Unique key
- Q2. Usage advantages and disadvantages of Indexing
- Ans.
Indexing improves data retrieval speed but can increase storage and maintenance costs.
Faster query performance: Indexes allow for quicker data retrieval. For example, searching for a user by ID is faster with an index.
Reduced I/O operations: Indexes minimize the number of disk reads required to find data, enhancing performance.
Increased storage requirements: Indexes consume additional disk space, which can be significa...
SQL- 1 departments with no users
2 dept_id and their respective no. of users
DSA1: Most frequent no. in an array
DSA2: Zero Sum subarray exists
Interview Preparation Tips
Selected
I applied via Referral and was interviewed before Oct 2023. There were 3 interview rounds.
(2 Questions)
- Q1. Find duplicates in an array
- Ans.
Use a hash set to find duplicates in an array of strings.
Create a hash set to store unique elements.
Iterate through the array and check if the element is already in the hash set.
If it is, then it is a duplicate. If not, add it to the hash set.
- Q2. Find single duplicate element in an array where contents of the array are length of array - 1
Create a student support system
(1 Question)
- Q1. Design an order and payments system for an EdTech company
- Ans.
Design an order and payments system for an EdTech company
Allow users to browse and select courses
Implement a shopping cart for users to add courses
Integrate payment gateways for secure transactions
Provide order confirmation and receipt to users
Allow users to track their order status
Skills evaluated in this interview
Top trending discussions
Interview questions from similar companies
I appeared for an interview in Nov 2020.
(3 Questions)
Round duration - 60 minutes
Round difficulty - Easy
- Q1.
Path Queries Problem Statement
Consider a weighted, undirected graph with 'V' vertices numbered from 1 to 'V' and 'E' bidirectional edges. You are tasked with handling 'Q' queries. For each query, you are...
- Ans.
Implement a function to find the shortest distance between two vertices in a weighted, undirected graph.
Use Dijkstra's algorithm to find the shortest path between the given vertices.
Create a graph data structure to represent the weighted, undirected graph.
Handle cases where no path exists between the given vertices by returning -1.
Optimize the algorithm to handle multiple queries efficiently.
Consider edge cases such as...
- Q2.
Merge Sort Algorithm Problem Statement
Your task is to sort a sequence of numbers stored in the array ‘ARR’ in non-descending order using the Merge Sort algorithm.
Explanation:
Merge Sort is a divide-an...
- Ans.
Implement Merge Sort algorithm to sort a sequence of numbers in non-descending order.
Divide the input array into two halves recursively
Sort the two halves separately
Merge the sorted halves to produce a fully sorted array
Time complexity of Merge Sort is O(n log n)
Example: Input - [5, 2, 9, 1, 5], Output - [1, 2, 5, 5, 9]
- Q3.
Rat in a Maze: All Paths Problem
You are provided with an
N * Nmaze where a rat is positioned at starting cellMAZE[0][0]. The goal is to determine and print all possible paths that the rat can take to r... - Ans.
Given an N * N maze with binary values, find and print all possible paths for a rat to reach the destination cell.
Use backtracking to explore all possible paths from the starting cell to the destination cell.
At each cell, check if it is a valid move (within bounds and not blocked), then recursively explore all four directions.
Keep track of the path taken so far and mark the cells accordingly.
Once the destination cell i...
Interview Preparation Tips
Tip 1 : Practice Atleast 250 Questions
Tip 2 : Do atleast 2 projects
Tip 1 : Have some projects on resume.
Tip 2 : Do not put false things on resume.
Skills evaluated in this interview
Selected
I applied via Coding ninjas and was interviewed before Nov 2023. There were 3 interview rounds.
Pizza restaurant website
(2 Questions)
- Q1. Javascript related questions
- Q2. React fundamentals and redux and saga function
(1 Question)
- Q1. Round with CEO for culture fit
(2 Questions)
- Q1. What is OOPS concepts.
- Q2. What is PDO and uses in PHP.
- Ans.
PDO stands for PHP Data Objects, a database access layer providing a uniform method of access to multiple databases.
PDO is a PHP extension that provides a data-access abstraction layer.
It supports multiple database systems like MySQL, PostgreSQL, SQLite, etc.
PDO helps prevent SQL injection attacks by using prepared statements.
It allows for error handling and supports transactions.
Example: $pdo = new PDO('mysql:host=loc...
Skills evaluated in this interview
Basic coding and MySQL queries. Like Types of join, having and where difference etc.
(1 Question)
- Q1. Salary Discussion.
Coding Ninjas HR Interview Questions
Selected
I applied via Naukri.com and was interviewed in Jan 2023. There were 3 interview rounds.
Aptitude test was first round. it was hard level
Program on string, oops , exception handling
Interview Preparation Tips
I applied via Campus Placement and was interviewed in Aug 2022. There were 4 interview rounds.
2 coding questions with aptitude question(logical aptitude and quantitative aptitude)
This was a Machine Coding. We need to design a system and then they will check our design by running test cases. It was 2.5 hrs long.
(2 Questions)
- Q1. Basic questions on computer core subjects(Deadlock, Networking, Tcp connection, process scheduling etc, DNS Lookup etc)
- Q2. Questions on React, Node and the libraries which I used in my project(My project was a full stack project)
Interview Preparation Tips
- Computer Networking
- Operating Systems
- Database Management
- React.Js
- Data Structures
Vimal
(1 Question)
- Q1. About Lighnting Web componet
Hard test dsa question practice more leetcode
(1 Question)
- Q1. Dsa question Array Powershell scripting Cpp Python
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