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IP address is a unique numerical label assigned to each device connected to a computer network, while MAC address is a unique identifier assigned to network interfaces for communications at the data link layer.
IP address stands for Internet Protocol address and is used for identifying devices on a network.
MAC address stands for Media Access Control address and is a unique identifier assigned to network interfaces.
IP ad...
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I appeared for an interview in Mar 2021.
Round duration - 90 minutes
Round difficulty - Medium
Started with projects discussion and internships and moved forward with coding problems.
It started at around 6:00 PM and lasted for 90 minutes approximately
The interviewer was very cool, he even gave me some tips on improving myself further at the end of the interview.
Given a string S
of length N
and an integer K
, find the length of the longest substring that contains at most K
distinct characters.
The first...
Find the length of the longest substring with at most K distinct characters in a given string.
Use a sliding window approach to keep track of the characters and their counts within the window.
Maintain a hashmap to store the characters and their frequencies.
Update the window size and characters count as you iterate through the string.
Return the maximum window size encountered for each test case.
Given an array of integers with numbers in random order, write a program to find and return the number which appears the most frequently in the array.
If multip...
Find the number with the maximum frequency in an array of integers.
Iterate through the array and keep track of the frequency of each number using a hashmap.
Find the number with the maximum frequency and return it.
If multiple elements have the same maximum frequency, return the one that appears first.
Ninja wants to travel from his house to his best friend's house. The locations of the houses are on a 2D coordinate plane, where Ninja's house is located at the origin (0...
Determine if Ninja can reach his friend's house with even x-coordinate without using modulus operator.
Check if the x-coordinate is even or odd by using bitwise AND operation with 1.
Return 1 if x-coordinate is even, else return 0.
Handle multiple test cases by iterating through each input.
Round duration - 60 minutes
Round difficulty - Easy
I was asked a coding question then, a system design question and some basic operating systems and oops questions
Given an array ARR
of size 'N', where each integer is in the range from 0 to N - 1, identify all elements that appear more than once.
Return the duplicate elements in any orde...
Find duplicates in an array of integers within a specified range.
Iterate through the array and keep track of the count of each element using a hashmap.
Return elements with count greater than 1 as duplicates.
Time complexity can be optimized to O(N) using a set to store seen elements.
Designing a Google Search Engine involves creating a web crawler, indexing system, and ranking algorithm.
Develop a web crawler to discover and retrieve web pages.
Implement an indexing system to store and organize the content of web pages.
Design a ranking algorithm to determine the relevance of search results.
Include features like autocomplete, spell check, and personalized search results.
Optimize for speed and scalabil...
Tip 1 : Practice data structures problems
Tip 2 : Read about System Designs
Tip 3 : Study the popular algorithms
Tip 1 : Mention your projects
Tip 2 : Mention your internships
I appeared for an interview in Mar 2022.
Round duration - 90 minutes
Round difficulty - Medium
Only Java allowed
Given an integer array ARR
of size N
containing only integers 0 and 1, implement a function to sort this array. The solution should scan the array only once without using an...
Sort an array of 0s and 1s in linear time without using additional arrays.
Iterate through the array and maintain two pointers, one for 0s and one for 1s.
Swap elements at the two pointers based on the current element being 0 or 1.
Continue this process until the entire array is sorted in place.
Round duration - 60 minutes
Round difficulty - Easy
Basic intro and coding questions
An integer N
is provided, and the task is to determine if N
is a perfect square. A perfect square refers to an integer which can be expressed as the square of another integer.
Implement a function to check if a given integer is a perfect square.
Create a function that takes an integer as input and returns true if it is a perfect square, false otherwise.
Iterate through possible square roots of the input integer and check if the square of the root equals the input.
Return true if a perfect square is found, false otherwise.
Given a sequence of numbers 'ARR', your task is to return a sorted sequence of 'ARR' in non-descending order using the Merge Sort algorithm.
ARR = [5, 3, 8,...
Implement Merge Sort algorithm to sort a given sequence of numbers in non-descending order.
Merge Sort is a divide-and-conquer algorithm that splits the array into two halves, recursively sorts each half, and then merges the sorted halves back together.
Time complexity of Merge Sort is O(n log n) in the worst case scenario.
It is a stable sorting algorithm, meaning that the relative order of equal elements is preserved.
Ex...
Round duration - 60 minutes
Round difficulty - Medium
More difficult than the previous round
Given a binary tree, the task is to print its bottom view from left to right. Assume the left and the right child nodes make a 45-degree angle with their paren...
The task is to print the bottom view of a binary tree from left to right.
Traverse the binary tree in level order and keep track of the horizontal distance of each node from the root.
Store the nodes at each horizontal distance in a map, updating it as you traverse the tree.
After traversal, extract the bottom-most nodes at each horizontal distance to get the bottom view sequence.
Round duration - 70 minutes
Round difficulty - Medium
There were no DSA questions. My interviews were based on android app development. The interviewer presented scenarios and asked how will you solve them. No particular correct answer was expected just the best approach as per me.
Implement multiple RecyclerViews on a magnified screen in an Android app by adjusting item sizes and spacing.
Adjust item sizes and spacing based on screen magnification level
Use nested RecyclerViews or custom layouts to display multiple lists
Implement custom item decorators to manage spacing between RecyclerViews
Consider using a GridLayoutManager with custom span sizes for each RecyclerView
Implementing cart functionality in an e-commerce application involves managing user interactions, updating quantities, handling discounts, and processing orders.
Create a data structure to store cart items, quantities, and prices.
Implement add to cart, remove from cart, and update quantity functionalities.
Handle discounts, promotions, and coupon codes.
Calculate total price, including taxes and shipping costs.
Implement c...
Round duration - 30 minutes
Round difficulty - Easy
HR asked questions about why Mobikwik, what's your goal, how are you a good fit, etc.
Tip 1 : Prepare advanced array questions
Tip 2 : Trees basic to medium questions
Tip 3 : Optimize solutions
Tip 1 : Internship experience
Tip 2 : Personal Projects (remember proper details)
I applied via Referral and was interviewed in Jul 2024. There were 2 interview rounds.
It was about DS Algo and Java garbage collection,multithreading
Rate limiter is a system that controls the rate of traffic sent or received by a network interface.
Implement a token bucket algorithm to track and limit the rate of requests
Use a sliding window algorithm to track the number of requests within a specific time frame
Consider using a distributed rate limiter for scalability and fault tolerance
I applied via Referral and was interviewed before Nov 2021. There were 4 interview rounds.
To exploit/test for vulnerabilities, use penetration testing tools and techniques to simulate attacks and identify weaknesses.
Use vulnerability scanners to identify potential vulnerabilities
Conduct penetration testing to simulate attacks and identify weaknesses
Perform social engineering tests to assess human vulnerabilities
Use fuzzing techniques to identify software vulnerabilities
Conduct code reviews to identify poten...
SSRF is an attack that allows an attacker to send a crafted request from a vulnerable web application. CSRF is an attack that tricks a victim into performing an action on a website without their knowledge or consent.
SSRF stands for Server-Side Request Forgery while CSRF stands for Cross-Site Request Forgery.
SSRF allows an attacker to send a request from a vulnerable server to a third-party server while CSRF tricks a vi...
I appeared for an interview in Jan 2022.
Round duration - 120 Minutes
Round difficulty - Medium
The first round was an assessment round comprised of MCQ questions of DSA, RDBMS, MySQL questions and 2 coding questions to be written in java only
Given a binary matrix of size N * M
where each element is either 0 or 1, find the shortest path from a source cell to a destination cell, consisting only...
Find the shortest path in a binary matrix from a source cell to a destination cell consisting only of 1s.
Use Breadth First Search (BFS) to explore all possible paths from the source cell to the destination cell.
Keep track of visited cells to avoid revisiting them.
Update the path length as you traverse through the matrix.
Return the shortest path length found or -1 if no valid path exists.
You are provided with an array of integers ARR
of size N
and an integer K
. Your task is to find and return the K
-th smallest value present in the array. All elements...
Find the K-th smallest element in an array of distinct integers.
Sort the array and return the element at index K-1.
Use a min-heap to find the K-th smallest element efficiently.
Implement quickselect algorithm for optimal performance.
Round duration - 60 Minutes
Round difficulty - Medium
The basic data structure round duration 1 hour, in this Interviewer, was very friendly and asked some casual questions. After that, he asked me to code.
Given an array of integers, determine the maximum possible sum of any contiguous subarray within the array.
array = [34, -50, 42, 14, -5, 86]
Find the maximum sum of any contiguous subarray within an array of integers.
Iterate through the array and keep track of the maximum sum of subarrays encountered so far.
At each index, decide whether to include the current element in the subarray or start a new subarray.
Update the maximum sum if a new maximum is found.
Example: For array [34, -50, 42, 14, -5, 86], the maximum sum is 137.
Example: For array [-5, -1, -8, -9]
Round duration - 60 Minutes
Round difficulty - Hard
Advance data structure round duration 1 hour, in this Interviewer asked some basic questions on oops, puzzles and asked me to code them later.
Given a singly linked list of integers, return the head of the reversed linked list.
Initial linked list: 1 -> 2 -> 3 -> 4 -> NULL
Reversed link...
Reverse a singly linked list of integers and return the head of the reversed linked list.
Iterate through the linked list and reverse the pointers to point to the previous node instead of the next node.
Use three pointers to keep track of the current, previous, and next nodes while reversing the linked list.
Update the head of the reversed linked list as the last node encountered during the reversal process.
You are provided with an array ARR
of integers representing an elevation map, where ARR[i]
denotes the elevation of the ith
bar. Determine the maximum amount of rainwater that can be t...
Given an array representing an elevation map, find the maximum amount of rainwater that can be trapped between the bars.
Iterate through the array and calculate the maximum height on the left and right of each bar.
Calculate the trapped water by finding the minimum of the maximum heights on the left and right minus the current bar height.
Sum up the trapped water for all bars to get the total trapped rainwater.
Example: Fo...
Round duration - 30 Minutes
Round difficulty - Medium
Vice President interview round duration 30mins, in this round VP’s of different domains taking interview to the selected candidates.
Imagine you are Harshad Mehta's friend, and you have been given the stock prices of a particular company for the next 'N' days. You can perform up to two buy-and-sell ...
The task is to determine the maximum profit that can be achieved by performing up to two buy-and-sell transactions on a given set of stock prices.
Iterate through the array of stock prices to find the maximum profit that can be achieved by buying and selling stocks.
Keep track of the maximum profit that can be obtained by performing two transactions.
Consider all possible combinations of buying and selling stocks to maxim...
Round duration - 30 Minutes
Round difficulty - Easy
This round lasted for 30mins basic HR questions were asked
Tip 1 : Prepare DSA well.
Tip 2 : Always remember and go through your all projects.
Tip 3 : Practice as many DSA questions as you can.
Tip 1 : Resume should be one page only as being a fresher impacts a lot.
Tip 2 : Resumes should contain all the links for projects and certificates as it impresses the interviewer.
I applied via LinkedIn and was interviewed before Jun 2022. There were 4 interview rounds.
I applied via Approached by Company and was interviewed before Sep 2023. There was 1 interview round.
I applied via Campus Placement and was interviewed before Apr 2020. There was 1 interview round.
I appeared for an interview before Jan 2021.
Round duration - 60 minutes
Round difficulty - Easy
I couldn't find an optimal approach to the first question, so she skipped that question and proceeded to next questions. Remaining questions I have answered satisfactorily.
Given an array/list of positive integers and an integer K, determine if there exists a subset whose sum equals K.
Provide true
if such a subset exists, otherwise r...
Given an array of positive integers and an integer K, determine if there exists a subset whose sum equals K.
Use dynamic programming to solve this problem efficiently
Create a 2D array to store if a subset with a particular sum exists
Iterate through the array and update the 2D array accordingly
Check if the value at the end of the iteration is true for the given K
Given an undirected and disconnected graph G(V, E) where V vertices are numbered from 0 to V-1, and E represents edges, your task is to output the BFS traversal starting from the ...
BFS traversal in a disconnected graph starting from vertex 0.
Implement BFS algorithm to traverse the graph starting from vertex 0.
Use a queue to keep track of visited nodes and their neighbors.
Ensure to print the traversal sequence in the correct order.
Handle disconnected components by checking for unvisited nodes.
Follow the BFS approach of exploring neighbors before moving to the next level.
Round duration - 60 minutes
Round difficulty - Easy
I told that my strength is problem solving and I can always find a way when there is a bottle-neck. Gave some examples of my experiences while doing my assignments.
Given a string STR
consisting of words separated by spaces, your task is to replace all spaces between words with the characters "@40".
The first line contains an integ...
Replace spaces in a string with '@40'.
Iterate through each character in the string
Replace spaces with '@40'
Return the modified string
Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
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