MakeMyTrip Interview Questions and Answers

Q1. Coding ques - Simplify the expression eg -> a +(b-c)-(f-d) , Output should be a+b-c-f+d (Hint use Stacks for storing only signs)
Ans. 
Simplify mathematical expressions using stacks to manage signs effectively.
• Use a stack to keep track of the current sign (+ or -).

• Iterate through the expression character by character.

• When encountering '(', push the current sign onto the stack.

• When encountering ')', pop the sign from the stack.

• Adjust the signs based on the current context (e.g., if a '-' is encountered).

• Example: For 'a +(b-c)-(f-d)', the output should ...read more
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Q2. Coding ques - Find the longest consecutive numbers length in the array. [-1,0,4,5,8,10,6] Output should be 3 as the longest length is 4, 5, 6 so the length turns out to be 3 (Hint use HashSet)
Ans. 
Find the length of the longest consecutive sequence in an array using a HashSet.
• Use a HashSet to store unique elements for O(1) lookups.

• Iterate through each number in the array.

• For each number, check if it's the start of a sequence (i.e., number - 1 is not in the set).

• Count consecutive numbers by checking if the next number exists in the set.

• Example: For [-1, 0, 4, 5, 8, 10, 6], the longest sequence is 4, 5, 6 with len...read more
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Q1. Explain current projects ?
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Q2. Train water trapping problem
Ans. 
Train water trapping problem involves calculating the amount of water that can be trapped between blocks.
• Calculate the maximum height of blocks on left and right of each block

• Find the minimum of the two heights and subtract the height of the current block to get trapped water

• Sum up the trapped water for all blocks to get total trapped water
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Q1. Reverse stack which using another stack (Recursion)
Ans. 
Reverse a stack using another stack and recursion to achieve the desired order of elements.
• Use a temporary stack to hold elements while reversing.

• Pop elements from the original stack and push them onto the temporary stack.

• Once the original stack is empty, pop from the temporary stack to restore the order.

• Recursion can be used to pop all elements and then push them back in reverse order.
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Q2. Find element in sorted rotated array
Ans. 
Search for an element in a sorted rotated array
• Use binary search to find the pivot point where the array is rotated

• Then perform binary search on the appropriate half of the array to find the element

• Handle cases where the element is not found in the array
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Q1. LLD for twitter
Ans. 
Design a low-level architecture for a Twitter-like social media platform.
• User Management: Handle user registration, authentication, and profiles.

• Tweet Management: Allow users to create, read, update, and delete tweets.

• Feed Generation: Implement algorithms to generate a personalized feed for users.

• Follow System: Enable users to follow/unfollow others and manage relationships.

• Notifications: Provide real-time notification...read more
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Q1. HLD for poker game
Ans. 
Design a high-level architecture for a multiplayer poker game application.
• User Authentication: Players can create accounts and log in securely.

• Game Lobby: A centralized area where players can join or create poker tables.

• Game Logic: Implement rules for poker variants (e.g., Texas Hold'em, Omaha).

• Real-time Communication: Use WebSockets for real-time updates between players.

• Database: Store user profiles, game history, and...read more
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Q1. Standard LeetCode Hard Question. But interviewer did not give the required image to understand what exactly was required. He himself was confused.
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Q1. Api status codes, api debugging questions
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Q2. If you get 500 error how to debug.
Ans. 
To debug a 500 error, check server logs, review code changes, test API endpoints, and use debugging tools.
• Check server logs for error details

• Review recent code changes that may have caused the error

• Test API endpoints using tools like Postman

• Use debugging tools like Chrome DevTools or Firebug
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Q3. One java string question merge two strings diagonally.
Ans. 
Merge two strings diagonally in a Java array of strings.
• Iterate through each row and column to merge characters diagonally

• Keep track of the diagonal position to insert characters from both strings

• Handle cases where strings have different lengths

• Example: String 1: 'hello', String 2: 'world', Merged: 'hweolrllod'

• Example: String 1: 'abc', String 2: '123', Merged: 'a1b2c3'
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1 hr of test on code earth platform

Q1. LPS array in string
Ans. 
LPS array in string refers to the Longest Palindromic Substring array in a given string.
• Create an array to store all the palindromic substrings found in the given string.

• Iterate through the string and check for palindromic substrings of different lengths.

• Store the longest palindromic substrings in the array.
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Q2. DP on grid problem
Ans. 
Dynamic Programming on grid problems involves optimizing paths or values in a 2D matrix using overlapping subproblems.
• Define the grid dimensions (m x n) and initialize a DP table.

• Base case: Set DP[0][0] = grid[0][0] for starting point.

• Fill the first row and first column by accumulating values.

• Use the relation DP[i][j] = grid[i][j] + min(DP[i-1][j], DP[i][j-1]) for other cells.

• Example: For a grid with values, calculate ...read more
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