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I was interviewed in May 2022.
Round duration - 60 Minutes
Round difficulty - Medium
Timing was around 11 am
Environment was great, it intrigued me to join Blinkit.
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'.
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.
Round duration - 60 Minutes
Round difficulty - Medium
Timing 11 am
Interviewer had good knowledge
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
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().
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
Round duration - 30 Minutes
Round difficulty - Easy
This round is cultural fit round
Tip 1 : Prepare easy/medium level data structures questions in leetcode. Solve atleast 50 questions of multiple types like strings, arrays, tree, linked list, graph
Tip 2 : Go through Android basic questions like lifecycle, live data, MVC/mvp/ mvvm pattern, retrofit, data binding
Tip 3 : Atleast solve 5 design questions like how to build Instagram, analytics library, crashlytics
Tip 1 : be concise
Tip 2 : write only those keywords which you have in depth knowledge
Find sum of all numbers formed from root to leaf path in a binary tree
Traverse the binary tree using DFS
At each leaf node, add the number formed from root to leaf path to a sum variable
Return the sum variable
Time complexity: O(n)
Example: For a binary tree with root value 1, left child 2 and right child 3, the sum would be 12 + 13 = 25
Given a string, print all possible strings that can be made by placing spaces (zero or one) in between them.
Use recursion to generate all possible combinations of spaces
For each recursive call, either add a space or don't add a space between the current character and the next character
Base case is when there are no more characters left to add spaces between
Time complexity is O(2^n) where n is the length of the string
Preorder traversal without recursion
Use a stack to keep track of nodes
Push right child first and then left child onto stack
Pop top of stack and print value
Repeat until stack is empty
Find longest continuous patch on a 12 km road with updates in patches
Maintain a variable to keep track of current patch length
Update the variable whenever a new patch is added
Maintain a variable to keep track of longest patch so far
Compare current patch length with longest patch length and update if necessary
Use a sorted data structure like a binary search tree to store the patches for efficient search
Time complexity: ...
Find median of an unsorted array.
Sort the array and find the middle element
Use quickselect algorithm to find the median in O(n) time
If the array is small, use brute force to find the median
Find 'k' elements closest to a given number from a stream of characters.
Use a priority queue to keep track of closest elements.
Update the queue as new characters come in.
Return the 'k' closest elements from the queue.
Design a data structure with O(1) insert, remove, find-max, and delete-max operations.
Use a doubly linked list to maintain the elements in sorted order.
Use a hash table to store the pointers to the nodes in the linked list.
Maintain a pointer to the maximum element in the hash table.
Update the pointers in the hash table when inserting or removing elements.
Update the maximum pointer when deleting or inserting the maximum
Check if a given linked list is a palindrome.
Traverse the linked list and store the values in an array.
Compare the first and last elements of the array, then move towards the center.
If all elements match, the linked list is a palindrome.
Alternatively, use two pointers to find the middle of the linked list and reverse the second half.
Compare the first half with the reversed second half to check for a palindrome.
I was interviewed before Sep 2020.
Round duration - 1hour
Round difficulty - Hard
Given a 'Snake and Ladder' board with N rows and N columns, where positions are numbered from 1 to (N*N) starting from the bottom left, alternating direction each row, f...
Find the minimum number of dice throws required to reach the last cell on a 'Snake and Ladder' board.
Use Breadth First Search (BFS) algorithm to find the shortest path from start to end cell.
Keep track of visited cells and the number of dice throws required to reach each cell.
Consider the presence of snakes and ladders while calculating the next possible moves.
Return the minimum number of dice throws to reach the last
Round duration - 1hour
Round difficulty - Hard
Mvvm architecture
Implement a stack using a queue in MVVM architecture
Use two queues to simulate a stack
Push operation: Enqueue the element to queue 1
Pop operation: Dequeue all elements from queue 1 to queue 2, dequeue the last element from queue 2 (which is the top of the stack)
Ensure proper synchronization between the two queues
Example: Push(1), Push(2), Pop() should return 2
Round duration - 1hour
Round difficulty - Easy
Tip 1 : be confident
Tip 2 : always say truth about your experience
Tip 3 : don't be nervous
Tip 1 : mentioned project u worked on
Tip 2 : technical skills
I was interviewed in May 2021.
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
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.
The input sta...
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].
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.
For the giv...
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...
Round duration - 90 Minutes
Round difficulty - Easy
evening 4-5:30PM
interviewer was good
very supportive and giving hints
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
Round duration - 40 Minutes
Round difficulty - Easy
4-5 PM
Interviewer was good
Tip 1 : Practice Atleast 200 Questions
Tip 2 : Practice company specific interview question
Tip 3 : Prepare resume nicely
Tip 1 : Prepare resume very nicely.
Tip 2 : don't mention any tech stack you are confident of.
I applied via LinkedIn and was interviewed in Apr 2024. There was 1 interview round.
That is machine coding round, where one problem will be given and you have to implement proper functionality with correct test cases.
I was interviewed in Apr 2021.
Round duration - 60 minutes
Round difficulty - Easy
Started with brief intro(5 mins) about interviewer.
Problem solving question, question was already there in the codelink shared by the interviewer. He explained the problem again with sample testcase.
The Interviewer was friendly.
You are provided with a number of courses 'N', some of which have prerequisites. There is a matrix named 'PREREQUISITES' of size 'M' x 2. This matrix indicates that fo...
Given courses with prerequisites, determine a valid order to complete all courses.
Create a graph with courses as nodes and prerequisites as edges.
Use topological sorting to find a valid order to complete all courses.
Return an empty list if it's impossible to complete all courses.
Design a live video broadcast platform.
Implement video streaming functionality using protocols like RTMP or WebRTC
Include features for live chat, reactions, and audience engagement
Ensure scalability and reliability by using cloud services like AWS or Azure
Provide analytics for viewership data and user engagement
Integrate monetization options such as ads or subscriptions
Round duration - 90 minutes
Round difficulty - Medium
There were 2 interviewers(India HM and Seattle HM), India HM was just shadowing and didn't ask any questions. Started with intro, he asked in detail about what I do at current company(10 mins). Again, jumped into LP's(25 mins).
Given a binary tree and the values of two distinct nodes, determine the distance between these two nodes in the tree. The distance is defined as the minimum num...
Calculate the distance between two nodes in a binary tree.
Traverse the tree to find the paths from the root to each node
Find the lowest common ancestor of the two nodes
Calculate the distance by summing the distances from each node to the common ancestor
Your task is to determine the median of integers as they are read from a data stream. The median is the middle value in the ordered list of numbers. If the list length...
Find median of integers in a data stream as they are read.
Use two heaps - max heap for lower half of numbers and min heap for upper half.
Keep the size of two heaps balanced to find the median efficiently.
Handle even and odd number of elements separately to calculate median.
Return vector of medians after each element is read from the stream.
Round duration - 60 minutes
Round difficulty - Medium
There was only 1 interviewer in this round and We had no video sharing in this round so it was becoming difficult to understand each other.
Tip 1 : Bookmark the GFG Amazon Archives. It helped me a lot during my preparations. Reading other’s interview experiences is one of the best ways to get yourselves ready for the next job interview. Practice daily atleast 5 questions.
Tip 2 : Most commonly asked topics in Amazon Interviews ( as per the mail I received from my recruiter ) :
BFS/DFS/Flood fill, Binary Search, Tree traversals, Hash tables, Linked list, stacks, queues, two pointers/sliding window
Binary heaps, Ad hoc/string manipulations.
Tip 3 : Highly recommended sites for practicing questions ( usually practice medium and hard level questions) :
Leetcode (highly encouraged)
Geeksforgeeks (highly encouraged)
CodeZen( highly encouraged)
Codeforces
Tip 4 : This is a great bigocheatsheet that could be of great help https://www.bigocheatsheet.com/
Tip 1 : Mention past working experience in detail as how you were important to your previous company.
Tip 2 : Try to keep your resume to 1 page if work experience < 5 years
Tip 3 : Update your resume according to role you are applying for and never put false things on resume.
I was interviewed in Oct 2020.
Round duration - 90 minutes
Round difficulty - Easy
I got a call from an Amazon recruiter regarding the schedule of the test . She sent me the coding test link which I had to complete within a week. we can attempt the online test anytime, when we have time for a period of 90 minutes at a stretch.Once I completed the test, I got a call to schedule the interviews in two weeks.
Given arrays representing the costs of pants, shirts, shoes, and skirts, and a budget amount 'X', determine the total number of valid combinations that can be purchased ...
Determine total number of valid shopping combinations within budget
Iterate through all possible combinations of items from each array
Check if the total cost of the combination is within the budget
Return the count of valid combinations
You are provided with a matrix MAT
consisting of integers, with dimensions N x M
(i.e., N rows and M columns). Your objective is to determine the maximum sum submatrix with...
Find the maximum sum submatrix in a given matrix.
Iterate over all possible submatrices and calculate their sums
Use Kadane's algorithm to find the maximum sum subarray in each row
Combine the sums of rows to find the maximum sum submatrix
Round duration - 60 minutes
Round difficulty - Medium
Virtual interview occured in amazon chime.The interviewer gave his introduction, asked me a bit on the kind of projects I’ve worked on. Then he started with a data structure problem.
Given a binary tree where each node has pointers to its left, right, and a random node, create a deep copy of the binary tree.
The first line contains an ...
Clone a binary tree with random pointers and verify if cloning was successful by printing inorder traversal.
Create a deep copy of the binary tree with random pointers.
Print the inorder traversal of the cloned binary tree.
Verify cloning success by printing '1' if successful, '0' otherwise.
Ninja is in a city with 'N' colonies, where each colony contains 'K' houses. He starts at house number "sourceHouse" in colony number "sourceColony" and wants to reach house number ...
The Ninja Port Problem involves finding the minimum time for a ninja to travel between colonies and houses using secret paths and teleportation.
Calculate the minimum time considering teleportation within colonies, traveling between colonies, and secret paths.
Keep track of the number of secret paths used and ensure they are one-way.
Consider the constraints provided to optimize the solution.
Example: N=2, K=3, S=1, P=1, s...
Round duration - 75 Minutes
Round difficulty - Easy
This was taken by an engineering manager who asked me regarding my projects for around 10-15 mins and then we moved to a system design problem. He asked me to design Slack messenger.
I started by listing the functional and non-functional requirements(on which he questioned me a bit), then I moved to draw the high-level architecture. The components which I drew were the clients, gateway service(LB + authentication, etc), Messaging Service, User Service, Web Socket Manager service, Fan Out service(I added this for the group messages thing, but he didn’t interrogate much on that).
He asked me what would be the schema of my messages table and the scenarios in which the recipient user is online/offline.Also asked about the partitioning key and primary key of the 2-3 tables which I had made
Round duration - 60 minutes
Round difficulty - Hard
BarRaiser Round
This was again taken by an engineering manager who discussed my projects in depth for around 20-25 mins. In the remaining time he asked me 2 dsa questions. (Yes I too was surprised that he didn’t ask anything regarding design).
In almost all the rounds, I was asked questions related to Amazon Leadership principles, so do make sure you go through those before sitting for the interview process. You can refer to this link(https://www.codingninjas.com/codestudio/problem-lists/top-amazon-coding-interview-questions) for practicing the same, I found it useful.
In the design rounds, interviewer doesn’t expect the most ideal answer from you and unless your choice of technology is outrageously wrong, he won’t pinpoint that.
Given an array/list of strings STR_LIST
, group the anagrams together and return each group as a list of strings. Each group must contain strings that are anagrams of each other.
Group anagrams together in a list of strings.
Iterate through the list of strings and sort each string to group anagrams together.
Use a hashmap to store the sorted string as key and the original string as value.
Return the values of the hashmap as the grouped anagrams.
Your task is to find the sum list of two numbers represented by linked lists and return the head of the sum list.
The sum list should be a linked...
Add two numbers represented by linked lists and return the head of the sum list.
Traverse both linked lists simultaneously while keeping track of carry from previous sum
Create a new linked list to store the sum of the two numbers
Handle cases where one linked list is longer than the other by padding with zeros
Update the sum and carry values accordingly while iterating through the linked lists
Tip 1 : Expect questions related to Amazon Leadership principles in all rounds, so go through those thoroughly before sitting for the interview process.
Tip 2 : In the design rounds, interviewer doesn’t expect the most ideal answer from you and unless your choice of technology is outrageously wrong, he won’t pinpoint that.
Tip 3 : Data Structures questions are a must in all rounds, so try to master them thoroughly
Tip 1 : Make sure you know everything you mention in your resume
Tip 2 : Have some hands on with hackathons and contests ,which brings an added value to your resume
I was interviewed before Sep 2020.
Round duration - 90 minutes
Round difficulty - Medium
You are provided with a 2D array or list containing 'N' rows and 'M' columns, filled with 1s and 0s. Here, 1 indicates land, and 0 indicates water.
Your task is to ide...
Count the number of islands in a 2D matrix filled with 1s and 0s.
Iterate through the matrix and perform depth-first search (DFS) to find connected islands.
Use a visited array to keep track of visited cells to avoid redundant calculations.
Increment the island count whenever a new island is encountered.
Consider all eight directions (horizontal, vertical, and diagonal) while exploring the island.
Handle edge cases like out
You are provided with a Singly Linked List having 'N' nodes, where each node contains a single digit.
Your task is to return a node 'X', which serves as the he...
Return a node representing the head of a new Linked List with the sum of the 1st and 2nd half of the given Linked List.
Split the Linked List into two halves
Reverse the 2nd half of the Linked List
Add the corresponding digits from both halves while considering carry
Create a new Linked List with the sum digits
Round duration - 60 minutes
Round difficulty - Medium
You are given an array arr
of length N
. For each element in the array, find the next greater element (NGE) that appears to the right. If there is no such greater ele...
The task is to find the next greater element for each element in an array to its right, if no greater element exists, return -1.
Use a stack to keep track of elements for which the next greater element is not found yet.
Iterate through the array from right to left, popping elements from the stack until a greater element is found.
Store the next greater element for each element in a separate array.
If the stack is empty aft...
Round duration - 60 Minutes
Round difficulty - Hard
You are given a non-empty string without spaces, referred to as 'sentence', and a list of non-empty strings representing a dictionary. Your task is to construct and return all...
Given a sentence and a dictionary, construct and return all possible sentences by inserting spaces to form words from the dictionary.
Use backtracking to generate all possible combinations of words from the dictionary to form sentences.
Check if a substring of the sentence matches any word in the dictionary, if so, recursively call the function with the remaining substring.
Continue this process until the entire sentence ...
Given a string str
composed solely of the characters "{", "}", "(", ")", "[", and "]", determine whether the parentheses are balanced.
The first line contains ...
Check if given string of parentheses is balanced or not.
Use a stack to keep track of opening parentheses and pop when a closing parenthesis is encountered.
If stack is empty at the end and all parentheses are matched, the string is balanced.
If stack is not empty at the end or mismatched parentheses are encountered, the string is not balanced.
Round duration - 60 minutes
Round difficulty - Easy
Design a local transport system similar to BMTC
Introduce a fleet of buses covering various routes within the city
Implement a smart card system for easy payment and tracking
Include different types of buses like regular, AC, and Volvo for passenger comfort
Have designated bus stops with real-time information on bus arrivals
Offer discounted fares for students and senior citizens
Round duration - 60 minutes
Round difficulty - Easy
Tip 1 : Practice a lot.
Tip 2 : Focus on system design
Tip 3 : Focus on amazon Leadership principles.
Tip 1: Mention relevant details for job you are applying.
Tip 2: Be objective and concise.
Diameter of a binary tree and bfs and dfs questions
Data structure and algorithms
I applied via Referral and was interviewed in Jan 2023. There were 3 interview rounds.
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.
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