Meesho SDE-2 Interview Questions and Answers

Round duration - 60 Minutes
Round difficulty - Medium

Timing was around 11 am
Environment was great, it intrigued me to join Blinkit.

Q1. 
Pair Sum Problem Statement
You are given an integer array 'ARR' of size 'N' and an integer 'S'. Your task is to find and return a list of all pairs of elements where each sum of a pair equals 'S'.
Note:
...read more
Ans. 
Find pairs of elements in an array that sum up to a given value, sorted in a specific order.
• Sort the array in non-decreasing order.

• Use two pointers approach to find pairs with sum equal to 'S'.

• Return pairs in sorted order based on first value, with smaller second value coming first.
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Round duration - 60 Minutes
Round difficulty - Medium

Timing 11 am
Interviewer had good knowledge

Q1. Can you explain the activity lifecycle in Android development?
Ans. 
Activity lifecycle in Android development involves various states like onCreate, onStart, onResume, onPause, onStop, onDestroy.
• Activity is created with onCreate() method

• Activity becomes visible with onStart() and onResume() methods

• Activity goes into background with onPause() method

• Activity is stopped with onStop() method

• Activity is destroyed with onDestroy() method
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Q2. Can you explain the fragment lifecycle in Android development?
Ans. 
Fragment lifecycle in Android involves various states like created, started, resumed, paused, stopped, and destroyed.
• Fragments are created using the onCreateView() method.

• Fragments go through states like created, started, resumed, paused, stopped, and destroyed based on user interactions and system events.

• Fragment lifecycle methods include onCreate(), onStart(), onResume(), onPause(), onStop(), and onDestroy().
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Q3. Can you explain the MVVM pattern?
Ans. 
MVVM is a design pattern that separates the user interface from the business logic and data model.
• MVVM stands for Model-View-ViewModel

• Model represents the data and business logic

• View represents the UI components

• ViewModel acts as an intermediary between the Model and View, handling user input and updating the Model

• MVVM promotes separation of concerns and easier unit testing
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Round duration - 30 Minutes
Round difficulty - Easy

This round is cultural fit round

Round duration - 120 minutes
Round difficulty - Medium

it was morning 10AM-12
friendly environment given by the interviewer
It was machine coding round, the problem statement was to create a online food ordering system with various features.
interviewer was good and supportive

Round duration - 60 Minutes
Round difficulty - Medium

timing noon 3-4Pm
good interviewer 
interviwer was giving hints if required and all

Q1. 
Problem: Sort an Array of 0s, 1s, and 2s
Given an array/list ARR consisting of integers where each element is either 0, 1, or 2, your task is to sort this array in increasing order.
Input:
The input sta...read more
Ans. 
Sort an array of 0s, 1s, and 2s in increasing order.
• Use a three-pointer approach to sort the array in a single pass.

• Initialize three pointers for 0, 1, and 2 values and iterate through the array.

• Swap elements based on the values encountered to achieve the sorted array.

• Example: Input array [0, 2, 1, 1] should be sorted as [0, 1, 1, 2].
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Q2. 
Maximum Path Sum Problem Statement
You are given an n-ary tree consisting of 'N' nodes. Your task is to determine the maximum sum of the path from the root to any leaf node.
Example:
Input:
For the giv...read more
Ans. 
Find the maximum sum of the path from the root to any leaf node in an n-ary tree.
• Traverse the tree from root to leaf nodes, keeping track of the sum along the path.

• At each node, calculate the sum of the path from the root to that node and update the maximum sum found so far.

• Consider using depth-first search (DFS) to traverse the tree efficiently.

• Handle cases where nodes are absent (-1) by appropriately updating the pat...read more
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Round duration - 90 Minutes
Round difficulty - Easy

evening 4-5:30PM
interviewer was good
very supportive and giving hints

Q1. Design a system for BookMyShow to allow users to book movie tickets.
Ans. 
Design a system for BookMyShow to allow users to book movie tickets.
• Create a user-friendly website and mobile app for users to browse movies and showtimes.

• Implement a secure payment gateway for users to purchase tickets online.

• Develop a database to store movie information, showtimes, and user bookings.

• Include features like seat selection, ticket confirmation, and booking history for users.

• Integrate with cinema partners
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Round duration - 40 Minutes
Round difficulty - Easy

4-5 PM
Interviewer was good

Q1. Why should we hire you?
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Q2. Why are you considering a switch in your job?
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That is machine coding round, where one problem will be given and you have to implement proper functionality with correct test cases.

This was a machine coding round in which we have to implement an online cab booking service.

Standard problem solving round consists of two questions on tree and dp.

2 Coding questions both easy-medium level.
1. Based on the Sliding Window
2. Graph Question

A simple feed platform, which supports some basic functionality. The main point of this round was to see how well a candidate architect the application.

Q1. Basic discussion around the project & past experience.
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Q2. Design a 2/3rd Winning game.
Ans. 
Design a 2/3rd Winning game.
• The game should have a clear win condition

• The win condition should be achievable in 2/3rd of the total game time

• The game should have a balanced difficulty level

• The game should have a clear feedback system for the player

• Examples: Chess, Tic Tac Toe, Connect Four
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Q3. Discussion around how would you scale a application.
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Q4. NoSQL vs SQL difference
Ans. 
NoSQL is non-relational and schema-less while SQL is relational and has a fixed schema.
• NoSQL databases are horizontally scalable and can handle large amounts of unstructured data.

• SQL databases are vertically scalable and are better suited for structured data with complex relationships.

• NoSQL databases are often used in web applications, while SQL databases are commonly used in enterprise applications.

• Examples of NoSQL d...read more
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Q1. Hiring Manager round
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Q2. Basic discussions around past work, past processes, what are your future aspirations etc.
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Q3. This round was mainly for seeing the culture fitment of a candidate.
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Round duration - 60 Minutes
Round difficulty - Medium

This was a typical DS/Algo where I was asked to solve two questions related to Binary Trees and write the pseudo code for both of them followed by some theoretical questions related to Operating Systems.

Q1. 
K-th Largest Number in a BST
Given a binary search tree (BST) consisting of integers and containing 'N' nodes, your task is to find and return the K-th largest element in this BST.
If there is no K-th la...read more
Ans. 
Find the K-th largest element in a BST.
• Perform reverse in-order traversal of the BST to find the K-th largest element.

• Keep track of the count of visited nodes to determine the K-th largest element.

• Return -1 if there is no K-th largest element in the BST.
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Q2. 
Is Height Balanced Binary Tree Problem Statement
Determine if the given binary tree is height-balanced. A tree is considered height-balanced when:
1. The left subtree is balanced.
2. The right subtree is bala...read more
Ans. 
Determine if a given binary tree is height-balanced by checking if left and right subtrees are balanced and their height difference is at most 1.
• Check if the left subtree is balanced

• Check if the right subtree is balanced

• Calculate the height difference between the left and right subtrees

• Return 'True' if all conditions are met, otherwise return 'False'
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Q3. Can you explain the concepts of Zombie Process and Orphan Process in operating systems?
Ans. 
Zombie process is a terminated process that has completed execution but still has an entry in the process table. Orphan process is a process whose parent process has terminated.
• Zombie process is created when a child process completes execution but its parent process has not yet read its exit status.

• Zombie processes consume system resources and should be cleaned up by the parent process using wait() system call.

• Orphan p...read more
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Round duration - 60 Minutes
Round difficulty - Medium

This was also a Data Structures and Algorithm round where I was asked to solve 3 medium to hard level problems along with their pseudo code within 60 minutes .

Q1. 
Longest Substring Without Repeating Characters Problem Statement
Given a string S of length L, determine the length of the longest substring that contains no repeating characters.
Example:
Input:
"abac...read more
Ans. 
Find the length of the longest substring without repeating characters in a given string.
• Use a sliding window approach to keep track of the longest substring without repeating characters.

• Use a hashmap to store the index of each character in the string.

• Update the start index of the window when a repeating character is found.

• Calculate the maximum length of the window as you iterate through the string.

• Return the maximum le
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Q2. 
Problem: Search In Rotated Sorted Array
Given a sorted array that has been rotated clockwise by an unknown amount, you need to answer Q queries. Each query is represented by an integer Q[i], and you must ...read more
Ans. 
Search for integers in a rotated sorted array efficiently.
• Use binary search to efficiently search for integers in the rotated sorted array.

• Handle the rotation of the array while performing binary search.

• Return the index of the integer if found, else return -1.
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Q3. 
Count Subarrays with Sum Divisible by K
Given an array ARR and an integer K, your task is to count all subarrays whose sum is divisible by the given integer K.
Input:
The first line of input contains an...read more
Ans. 
Count subarrays with sum divisible by K in an array.
• Iterate through the array and keep track of the prefix sum modulo K.

• Use a hashmap to store the frequency of each prefix sum modulo K.

• For each prefix sum, increment the count by the frequency of (prefix sum - K) modulo K.

• Handle the case when prefix sum itself is divisible by K.

• Return the total count of subarrays with sum divisible by K.
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Round duration - 50 Minutes
Round difficulty - Medium

In this round , I was asked to code a simple question related to BST . After that I was asked the internal implementation of a Hash Map where I was supposed to design a Hash Map using any of the Hashing Algorithms that I know . This was preety challenging for me but I got to learn so much from it.

Q1. 
Ceil Value from BST Problem Statement
Given a Binary Search Tree (BST) and an integer, write a function to return the ceil value of a particular key in the BST.
The ceil of an integer is defined as the s...read more
Ans. 
Ceil value of a key in a Binary Search Tree (BST) is found by returning the smallest integer greater than or equal to the given number.
• Traverse the BST to find the closest value greater than or equal to the key.

• Compare the key with the current node value and update the ceil value accordingly.

• Recursively move to the left or right subtree based on the comparison.

• Return the ceil value once the traversal is complete.
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Q2. 
Design a Constant Time Data Structure
Create a data structure that maintains mappings between keys and values, supporting the following operations in constant time:
1. INSERT(key, value): Add or update t...read more
Ans. 
Design a constant time data structure to maintain mappings between keys and values with various operations.
• Use a hash table to achieve constant time complexity for INSERT, DELETE, SEARCH, and GET operations.

• Keep track of the number of key-value pairs for GET_SIZE operation.

• Check if the hash table is empty for IS_EMPTY operation.

• Return true or false for SEARCH operation based on key existence.

• Return the value associated...read more
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Round duration - 90 Minutes
Round difficulty - Hard

I found the online coding round of Flipkart to be quite difficult based on the constraints of the problem and their time limits. I coded the first problem quite easily but on the second and the third problem , my code could only pass a few test cases and gave TLE for most of them. Both the questions required very efficient solution and the last 5 to 10 Test Cases carried more weight than the rest so I didn't get through this round.

Q1. 
Print the Kth Digit
Given three non-negative integers N, M, and K, compute the Kth digit from the right in the number obtained from N raised to the power M (i.e., N ^ M).
Input:
The first line contains ...read more
Ans. 
The task is to find the Kth digit from the right in the number obtained from N raised to the power M.
• Iterate through the digits of N^M from right to left

• Keep track of the position of the current digit

• Return the digit at position K from the right
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Q2. 
The Skyline Problem
Compute the skyline of given rectangular buildings in a 2D city, eliminating hidden lines and forming the outer contour of the silhouette when viewed from a distance. Each building is ...read more
Ans. 
Compute the skyline of given rectangular buildings in a 2D city, eliminating hidden lines and forming the outer contour of the silhouette.
• Iterate through the buildings and create a list of critical points (x, y) where the height changes.

• Sort the critical points based on x-coordinate and process them to form the skyline.

• Merge consecutive horizontal segments of equal height into one to ensure no duplicates.

• Return the fin...read more
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Q3. 
Longest Palindromic Substring Problem Statement
You are provided with a string STR of length N. The goal is to identify the longest palindromic substring within this string. In cases where multiple palind...read more
Ans. 
Identify the longest palindromic substring in a given string.
• Iterate through the string and expand around each character to find palindromes

• Keep track of the longest palindrome found

• Return the longest palindrome with the smallest start index
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