Tydy Interview Questions and Answers

90 minute test on hacker rank consisting of 3 coding questions all of medium difficulty. Most candidates are required to solve more than 1 question.

Q1. Questions on concepts of OOPS and Operating Systems.
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Q2. Find least common ancestor of a binary tree.
Ans. 
Find the lowest common ancestor of a binary tree.
• Traverse the tree recursively from the root node.

• If the current node is null or matches either of the given nodes, return the current node.

• Recursively search for the nodes in the left and right subtrees.

• If both nodes are found in different subtrees, return the current node.

• If both nodes are found in the same subtree, continue the search in that subtree.
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Q3. Find first missing positive integer from an array for non-negative integers.
Ans. 
Find first missing positive integer from an array of non-negative integers.
• Create a hash set to store all positive integers in the array

• Loop through the array and add all positive integers to the hash set

• Loop through positive integers starting from 1 and return the first missing integer not in the hash set
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Q1. Design a parking lot
Ans. 
Design a parking lot
• Consider the size and capacity of the parking lot

• Decide on the layout and organization of parking spaces

• Implement a system to manage parking availability and reservations

• Include features like ticketing, payment, and security

• Consider scalability and future expansion
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Q1. Given a grid which represents an ocean( For all index i,j if mat[i][j] = 1 is island and mat[i][j] = 0 means water). Find the island with largest area.
Ans. 
Find the largest island area in a grid representing an ocean using DFS or BFS.
• Use Depth-First Search (DFS) or Breadth-First Search (BFS) to explore the grid.

• Mark visited cells to avoid counting them multiple times.

• Count the size of each island during the traversal.

• Example: For a grid [[1,0,0],[1,1,0],[0,0,1]], the largest island has area 3.

• Keep track of the maximum area found during the exploration.
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Q2. Given list of strings group them into distinct anagrams.
Ans. 
Group list of strings into distinct anagrams.
• Create a hash table with sorted string as key and list of anagrams as value.

• Iterate through the list of strings and add each string to its corresponding anagram list in the hash table.

• Return the values of the hash table as a list of lists.
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A regular aptitude test containing Verbal, Quants, and coding. Practice from Indiabix and go or any other aptitude exams website. Depending on your score in these sections you'll be shortlisted for the applied role. For BAs usually, the Verbal section is checked more thoroughly.

2o min round split into two rounds of two different topics: 1 abstract and 1 more based on current affairs.

Q1. Questions based on the resume were asked. About my internships, how did I plan my tasks in one of them.
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Q2. A guestimate question was asked along with some riddles
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Q1. Fundamentals based upon the role
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Q1. Basic advance question into the technical skills like if you’re applying for backend role and your preferred language is java then how does the stack and queue works
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Standard Aptitude topics, 30 mins - 30 questions

Q1. Case Study for how to design a data Lake ? standard questions - tell me about yourself, why us
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Q2. Case Study for how to design a chess game
Ans. 
Designing a chess game involves defining rules, user interface, and game mechanics for an engaging experience.
• Define the rules: Standard chess rules include piece movement, check, checkmate, and stalemate.

• User interface: Create a visually appealing board and pieces, with options for 2D or 3D views.

• Game mechanics: Implement turn-based play, timers, and difficulty levels for AI opponents.

• Multiplayer options: Allow for on...read more
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Q1. Explain about yourself
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Q2. Daily activity in current job role
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