CoinTribe Interview Questions and Answers

Q1. Find connected components in a graph
Ans. 
Use Depth First Search (DFS) to find connected components in a graph
• Start by initializing all vertices as unvisited

• Iterate through each vertex and perform DFS to find connected components

• Keep track of visited vertices to avoid revisiting

• Example: For a graph with vertices {A, B, C} and edges {(A, B), (B, C)}, the connected components are {A, B, C}
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Q1. Design chess game
Ans. 
Design a chess game with proper board setup, piece movements, and win conditions.
• Create a 8x8 grid to represent the chess board

• Assign initial positions to each type of chess piece (pawn, rook, knight, bishop, queen, king)

• Implement rules for each piece's movement (e.g. pawn moves forward, rook moves horizontally/vertically)

• Check for valid moves and capture opponent's pieces

• Implement win conditions (checkmate, stalemate)

• ...read more
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Q1. Find edge score of the nodes in a directed graph
Ans. 
Edge score of nodes in a directed graph
• Edge score is a measure of the importance of a node in a graph

• It is calculated by counting the number of edges that point to or from a node

• Nodes with higher edge scores are considered more important

• Edge score can be calculated using algorithms like PageRank or HITS
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Q1. Rotten oranges after every second in 2D matrix
Ans. 
Simulate rotting of oranges in a 2D matrix every second.
• Create a queue to store the coordinates of fresh oranges

• Iterate through the matrix and add the coordinates of fresh oranges to the queue

• Simulate the rotting process by iterating through the queue and rotting adjacent fresh oranges

• Keep track of the time taken for all oranges to rot

• Return -1 if there are any fresh oranges left after the simulation
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Q2. Java and Spring concepts, HTTP, HTTPS, OSI layers
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Q3. DB design for air ticket booking system
Ans. 
DB design for air ticket booking system
• Create tables for flights, passengers, bookings, and payments

• Use foreign keys to establish relationships between tables

• Include fields for flight details, passenger information, and payment details

• Consider implementing a caching mechanism for frequently accessed data
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Q1. Next Greater Element in an array
Ans. 
Find the next greater element in an array for each element
• Iterate through the array and for each element, find the next greater element

• Use a stack to keep track of elements whose next greater element is not yet found

• If the current element is greater than the top element of the stack, pop the stack and mark the popped element's next greater element as the current element

• Push the current element onto the stack

• If there ar...read more
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Q2. Question based on Sql inner join
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Q1. SQL, Python and Excel
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Case studies about Navi UPI

Case studies about Navi UPI App

Easy Medium questions

Q1. Asked to design Basic Facebook.
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Round duration - 75 Minutes
Round difficulty - Medium

The round consisted of 2 Coding based based questions.
These question were easy for as I have already done this while preparing.

Q1. 
Flip Equivalent Binary Tree Problem
Determine whether two binary trees, given by their roots 'ROOT1' and 'ROOT2', are flip equivalent. A tree can be transformed into a flip equivalent through any number o...read more
Ans. 
The problem is to determine if two binary trees are flip equivalent after performing flip operations on one of the trees.
• Perform a depth-first search (DFS) on both trees simultaneously

• At each node, check if the values are equal and the left and right subtrees are either both null or both not null

• If the above conditions are met, recursively check the flip equivalence of the left and right subtrees

• If any of the condition...read more
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Q2. 
Split Array Into Increasing Subsequences Problem Statement
You are provided with an integer array ARR of size N sorted in ascending order. Your task is to determine if it is possible to split this array i...read more
Ans. 
The task is to determine if an integer array can be split into one or more increasing subsequences with a length of at least 3.
• Check if the array can be split into increasing subsequences by iterating through the array.

• Keep track of the current subsequence and its length while iterating.

• If the difference between the current element and the previous element is not 1, start a new subsequence.

• If the length of any subseque...read more
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Round duration - 60 Minutes
Round difficulty - Easy

The interview started a bit late as I it to be at 11:30 am but started at 12:15pm So Had to wait. Apart from these the overall experience was great and the interviewer was also kind and had a smiling face.

Q1. 
Ninja and Alternating Largest Problem Statement
Ninja is given a sequence of numbers and needs to rearrange them so that every second element is greater than its neighbors on both sides.
Example:
Input:
...read more
Ans. 
The task is to rearrange the given array such that every second element is greater than its left and right element.
• Iterate through the array and check if every second element is greater than its left and right element

• If not, swap the current element with its adjacent element to satisfy the condition

• Continue this process until the entire array satisfies the condition

• Return 1 if the array satisfies the condition, else re
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Round duration - 30 Minutes
Round difficulty - Easy

10:30 PM 
Interviewer was Cool.

Round duration - 5 minutes
Round difficulty - Easy

At 10:00 am

Q1. Why do you want to join us
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Q2. How do you think this job is suitable for you
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Q3. Can you describe yourself in few words
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Q4. Can you tell who are the founders of ACKO
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Q1. Can you chalk down a plan for employee engagement for all kind of employees
Ans. 
Yes
• Conduct regular employee surveys to gather feedback and identify areas for improvement

• Implement a recognition and rewards program to acknowledge and appreciate employee contributions

• Provide opportunities for professional development and growth through training programs and workshops

• Promote open communication and transparency within the organization

• Organize team-building activities and events to foster a sense of cam...read more
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Q2. How proficient are you with designing tools and which ones
Ans. 
I am proficient in using various designing tools such as Adobe Photoshop, Illustrator, and Sketch.
• Proficient in Adobe Photoshop, Illustrator, and Sketch

• Experience in creating visually appealing designs

• Knowledge of design principles and best practices

• Ability to work with different file formats and export options
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Q3. Do you know what's the difference between Intranet and website?
Ans. 
Intranet is a private network for internal communication within an organization, while a website is a public platform accessible to anyone with an internet connection.
• Intranet is accessible only within an organization, while a website is accessible to anyone with an internet connection.

• Intranet is used for internal communication, sharing of information and resources within an organization, while a website is used for p...read more
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