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100+ Interview Questions and Answers

Updated 14 Nov 2024
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Q1. Painting Fences

You are given ‘N’ fences. Your task is to find the total number of ways to paint fences using 2 colors only such that at most 2 adjacent fences are painted with the same color.

As the answer can ...read more

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Q2. Cycle Detection in a Singly Linked List

You have given a Singly Linked List of integers, determine if it forms a cycle or not.

A cycle occurs when a node's next points back to a previous node in the list. The li...read more

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Q3. Integer To Roman Numeral

Given an integer ‘N’, the task is to find its corresponding Roman numeral.

Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M.

Symbol Value I 1 V 5 X 10 L ...read more
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Q4. Reverse Linked List

Given a singly linked list of integers. Your task is to return the head of the reversed linked list.

For example:
The given linked list is 1 -> 2 -> 3 -> 4-> NULL. Then the reverse linked lis...read more
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Q5. Cycle Detection In Undirected Graph

You have been given an undirected graph with 'N' vertices and 'M' edges. The vertices are labelled from 1 to 'N'.

Your task is to find if the graph contains a cycle or not.

A ...read more

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Q6. Longest Repeating Subsequence

You are given a string ‘st’, Your task is to find the length of the longest repeating subsequence such that two subsequences don’t have the same character at the same position.

For ...read more
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Q7. Painter's Partition Problem

Given an array/list of length ‘N’, where the array/list represents the boards and each element of the given array/list represents the length of each board. Some ‘K’ numbers of painter...read more

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Q8. Magic Index

You are given a sorted array A consisting of N integers. Your task is to find the magic index in the given array.

Note :
A magic index in an array A[0 ... N - 1] is defined to be an index i such that...read more
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Q9. Maximum Path Sum in the matrix

You have been given an N*M matrix filled with integer numbers, find the maximum sum that can be obtained from a path starting from any cell in the first row to any cell in the last...read more

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Q10. Merge Sort

Given a sequence of numbers ‘ARR’. Your task is to return a sorted sequence of ‘ARR’ in non-descending order with help of the merge sort algorithm.

Example :

Merge Sort Algorithm - Merge sort is a Div...read more
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Q11. Palindrome Partitioning ll

Given a string ‘str’. Find the minimum number of partitions to make in the string such that every partition of the string is a palindrome.

Given a string, make cuts in that string to m...read more

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Q12. Search In The Array

You are given two arrays ‘arr’ of size ‘n’ and ‘queries’ of size ‘q’. For each element ‘q’ in the array 'queries', your task is to find the sum of all elements in the array ‘arr’ which are le...read more

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Q13. Friends Pairing Problem

You are given an integer ‘N’, which denotes there are ‘N’ friends. You are supposed to form some pairs them satisfying the following conditions:

1. Each friend can be paired with some oth...read more

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Q14. Implementation: HashMap

Design a data structure that stores a mapping of a key to a given value and supports the following operations in constant time.

1. INSERT(key, value): Inserts an integer value to the data...read more
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Q15. Detect Cycle In A Directed Graph

Given a directed graph, check whether the graph contains a cycle or not. Your function should return true if the given graph contains at least one cycle, else return false.

Input...read more
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Q16. Minimum Character Deletion

You are given a string ‘STR’. You need to find and return the minimum number of characters to be deleted from ‘STR’ so that the frequency of each character in the string becomes unique...read more

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Q17. Count Ways To Reach The N-th Stairs

You have been given a number of stairs. Initially, you are at the 0th stair, and you need to reach the Nth stair. Each time you can either climb one step or two steps. You are...read more

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Q18. K Largest Element

You are given an unsorted array containing ‘N’ integers. You need to find ‘K’ largest elements from the given array. Also, you need to return the elements in non-decreasing order.

Input Format:...read more
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Q19. Reverse the String

You are given a string 'STR'. The string contains [a-z] [A-Z] [0-9] [special characters]. You have to find the reverse of the string.

For example:

 If the given string is: STR = "abcde". You h...read more
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Q20. Total area of overlapping rectangles

You are given two arbitrary rectangles on a 2-D coordinate plane, which may have an intersecting area. You have to find the net area covered by both the rectangles on the car...read more

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Q21. Maximum Difference

You are given an array 'ARR' of the 'N' element. Your task is to find the maximum difference between any of the two elements from 'ARR'.

If the maximum difference is even print “EVEN” without ...read more

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Q22. Sort Linked List

You are given a Singly Linked List of integers which is sorted based on absolute value.

You have to sort the Linked List based on actual values.

The absolute value of a real number x, denoted |x...read more

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Q23. Rearrange String

You are given a string “S”. Your task is to rearrange the characters of a string “S”, such that it does not contain any two adjacent characters which are the same.

If it is possible to rearrange...read more

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Q24. DFS Traversal

Given an undirected and disconnected graph G(V, E), containing 'V' vertices and 'E' edges, the information about edges is given using 'GRAPH' matrix, where i-th edge is between GRAPH[i][0] and GRAP...read more

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Q25. One Away

You are given two strings, string A and string B. Your task is to determine whether string A can be transformed into string B by performing only one of the following operations at most one (or maybe zer...read more

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Q26. Reverse Linked List
Input Format :
The first line of input contains a single integer T, re...read more
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Q27. Subset Sum Equal To K

You are given an array/list ‘ARR’ of ‘N’ positive integers and an integer ‘K’. Your task is to check if there exists a subset in ‘ARR’ with a sum equal to ‘K’.

Note: Return true if there ex...read more

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Q28. Find The Sum Of The Left Leaves

Given a binary tree with ‘root’. Your task is to find the sum of all the left leaf nodes.

Properties of leaf:-

In a binary tree, a leaf is a node such that it does not have any ch...read more

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Q29. Median of Two Sorted Arrays

You are given two sorted arrays 'A' & 'B' of sizes 'N' & 'M'. You need to find the median of the two arrays when merged. If the total number of elements i.e., N + M is even then the m...read more

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Q30. Delete a Node from Linked List

You have been given a linked list of integers. Your task is to write a function that deletes a node from a given position, 'POS'.

Note :
Assume that the Indexing for the linked lis...read more
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Q31. Sort An Array of 0s, 1s and 2s

You have been given an array/list ARR consisting of ‘N’ elements. Each element in the array is either 0, 1 or 2.

Now, your task is to sort this array/list in increasing order. For ...read more

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Q32. Find K Closest Elements

You are given a sorted array 'A' of length 'N', two integers 'K' and 'X'. Your task is to print 'K' integers closest to 'X', if two integers are at the same distance return the smaller on...read more

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Q33. N Queens

You are given an integer 'N'. For a given 'N' x 'N' chessboard, find a way to place 'N' queens such that no queen can attack any other queen on the chessboard.

A queen can be killed when it lies in the ...read more

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Q34. Kth largest element in the unsorted array

You are given an array consisting of 'N' distinct positive integers and a number 'K'. Your task is to find the kth largest element in the array.

Example:
Consider the ar...read more
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Q35. BFS in Graph

You are given an undirected and disconnected graph G(V, E) having V vertices numbered from 0 to V-1 and E edges. Your task is to print its BFS traversal starting from the 0th vertex.

BFS or Breadth-...read more

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Q36. Minimum Cost Path

You have been given a matrix of ‘N’ rows and ‘M’ columns filled up with integers. Find the minimum sum that can be obtained from a path which from cell (x,y) and ends at the top left corner (1,...read more

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Q37. Counting Sort

Ninja is studying sorting algorithms. He has studied all comparison-based sorting algorithms and now decided to learn sorting algorithms that do not require comparisons.

He was learning counting so...read more

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Q38. Next Greater Element

You are given an array arr of length N. You have to return a list of integers containing the NGE(next greater element) of each element of the given array. The NGE for an element X is the fir...read more

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Q39. Reverse Only Letters

You are given a string, ‘S’. You need to reverse the string where characters that are not an alphabet stay in the same place, and the rest reverse their positions.

Eg: “a-bcd” becomes “d-cba...read more

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Q40. Left View Of Binary Tree

Given a binary tree. Print the Left View of the Tree.

Example :
If the input tree is as depicted in the picture: 

alt text

The Left View of the tree will be: 2 35 2 
Input format :
Elements in t...read more
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Q41. Valid Parentheses

You're given string ‘STR’ consisting solely of “{“, “}”, “(“, “)”, “[“ and “]” . Determine whether the parentheses are balanced.

Input Format:
The first line contains an Integer 'T' which denot...read more
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Q42. Two Sum

You are given an array of integers 'ARR' of length 'N' and an integer Target. Your task is to return all pairs of elements such that they add up to Target.

Note:

We cannot use the element at a given inde...read more
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Q43. Remove Duplicates From String

You are given a string (STR) of length N, consisting of only the lower case English alphabet.

Your task is to remove all the duplicate occurrences of characters in the string.

For E...read more
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Q44. Group Anagrams Together

You have been given an array/list of strings 'STR_LIST'. You are supposed to return the strings as groups of anagrams such that strings belonging to a particular group are anagrams of one...read more

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Q45. Balanced Parentheses

Given an integer ‘N’ representing the number of pairs of parentheses, Find all the possible combinations of balanced parentheses with the given number of pairs of parentheses.

Note :

Conditi...read more
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Q46. Check Palindrome

Given an alphabetical string ‘S’. Determine whether it is palindrome or not. A palindrome is a string that is equal to itself upon reversing it.

For example:
‘S’ = racecar The reverse of ‘S’ is:...read more
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Q47. Divide Two Integers

You are given two integers ‘dividend’ and ‘divisor’. You are required is to divide the integers without using multiplication, division and modular operators. Your task is to return the quotie...read more

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Q48. Count characters

Write a program to count and print the total number of characters (lowercase english alphabets only), digits (0 to 9) and white spaces (single space, tab i.e. '\t' and newline i.e. '\n') entered...read more

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Q49. Replace Spaces

You have been given a string 'STR' of words. You need to replace all the spaces between words with “@40”.

Input Format:
The first line contains a single integer ‘T’ representing the number of test...read more
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Q50. Input a file. Select first 3 lines of the file. Select the longest line and count the number of words in that line. It was easy. I used Java methods to solve the problem. I explained the logic and he accepted i...

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Ans.

The program reads a file and selects the first 3 lines. It then identifies the longest line and counts the number of words in that line.

  • Read the file using appropriate file handling methods

  • Store the first 3 lines in an array of strings

  • Iterate through the array to find the longest line

  • Count the number of words in the longest line using string manipulation methods

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Q51. Vertical Order Traversal

The Ultimate Ninja Ankush is a straightforward, no-nonsense guy and loves binary Trees, and he has given you a binary tree, and you have to return the vertical order traversal of the val...read more

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Q52. But amazon can do the search in O(n). Why it has to go for O(nk)? For data structures like Hash tables and for large data, n will be large. So O(nk) is better than O(n) (former n is smaller than latter n).

Ans.

O(nk) is better than O(n) for large data and hash tables.

  • O(nk) is better because it takes into account the size of the data and the number of keys.

  • For large data and hash tables, the size of n will be large, making O(nk) more efficient.

  • O(n) assumes a constant number of keys, which may not be the case in practice.

  • Amazon may have chosen O(nk) for better scalability and performance.

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Q53. Dijkstra's shortest path

You have been given an undirected graph of ‘V’ vertices (labeled 0,1,..., V-1) and ‘E’ edges. Each edge connecting two nodes (‘X’,’Y’) will have a weight denoting the distance between no...read more

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Q54. When you search for a particular product in amazon, it displays some of the search results. But, only few particular products which are available in amazon are displayed, not all. How does this happen? I told M...

read more
Ans.

Amazon displays only a subset of search results based on various factors like relevance, popularity, and user preferences.

  • Amazon uses algorithms to determine which products to display in search results.

  • Factors considered include product relevance, customer reviews, sales rank, and availability.

  • Machine learning techniques may be used to personalize search results based on user behavior and preferences.

  • Amazon also considers factors like seller reputation and fulfillment options...read more

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Q55. There exists a 3x3 matrix, start from the first element reach the last element of the matrix, between each edges there exists a weight. Reach the destination such that the sum of weights should be small. It was...

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Ans.

The question is about finding the shortest path in a 3x3 matrix with weighted edges.

  • This is a graph traversal problem.

  • Use a graph algorithm like Dijkstra's algorithm or A* search to find the shortest path.

  • Assign weights to the edges and calculate the sum of weights for each possible path.

  • Choose the path with the smallest sum of weights as the shortest path.

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Q56. Technical Question

When you search for a particular product in amazon, it displays some of the search results. But, only few particular products which are available in amazon are displayed, not all. How does thi...read more

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Q57. Technical Question

What is hashing and how can it be implemented?

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Q58. Puzzle

He showed a puzzle where n-balloons were there and I had to burst maximum balloons using an arrow.

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Q59. Similar String Groups

Two strings ‘S1’ and ‘S2’ are considered similar if either ‘S1’ equals ‘S2’ or we can swap two letters of ‘S1’ (at different positions) so that it equals ‘S2’.

For Example :

“code” and “eod...read more
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Q60. How would I explain the concept of prime number to an illiterate?

Ans.

A prime number is a number that is divisible only by 1 and itself.

  • A prime number has exactly two factors: 1 and itself.

  • Prime numbers cannot be divided evenly by any other number.

  • Examples of prime numbers include 2, 3, 5, 7, 11, 13, 17, etc.

Add your answer
Q61. DBMS Questions

Asked me about some advanced DBMS concepts like windowing, triggers, joins, and indexing.

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Q62. What js E cheque ? And what is the time for its clearance

Ans.

An e-cheque is an electronic version of a paper cheque that is used for making payments online.

  • E-cheques are created and signed digitally, eliminating the need for physical paper.

  • They are typically used for online transactions and can be deposited into a bank account electronically.

  • The clearance time for e-cheques varies depending on the bank and the specific transaction.

  • It can take anywhere from a few hours to several business days for an e-cheque to clear.

  • During the clearan...read more

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Q63. System Design Question

The questions will be based on low level system design and you will be given certain conditions for which you have to design a system.

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Q64. Basic HR question

This round is behavioral and cultural based round and manager wants to know how can i handle the critical situation.

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Q65. What will be the key and what will be the values? The product will be the key. The brands will be the values.

Ans.

The product will be the key and the brands will be the values.

  • The key in this case refers to the unique identifier for each product.

  • The values are the different brands associated with each product.

  • For example, if the product is a smartphone, the key could be the model number and the values could be the different brands that manufacture that model.

Add your answer
Q66. Networking Question

He asked me how I will check whether I have internet connection in my system?

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Q67. Five advantages of spring boot Which java version you currently use? Features of the java version you use Output from the code Difference between this and super In order to update the string, which will be bett...

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Ans.

Spring Boot offers advantages like rapid development, easy configuration, embedded servers, production-ready features, and more.

  • Rapid development: Spring Boot simplifies the setup and configuration of Spring applications, allowing developers to focus on writing business logic.

  • Easy configuration: Spring Boot provides auto-configuration, reducing the need for manual setup and boilerplate code.

  • Embedded servers: Spring Boot comes with embedded servers like Tomcat, Jetty, and Unde...read more

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Q68. Basic HR Questions

Questions on optimisations of a particular use case and scenario.
How can we reduce the number of API calls?

Behavioural questions on leadership aspirations etc.

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Q69. System Design Questions

1. Merchant Onboarding Design
2. Restaurant Design

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Q70. Technical Questions

What are your strengths and weaknesses?

Why do you want to join us?

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Q71. Technical Questions

What is JIT compiler?

Scheduling algos.

2nd highest salary using joins of tables

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Q72. Puzzle

In how many attempts can one find a defective ball among 10 given balls after weighting it in a 2 weight weighting pan?

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Q73. Puzzle

There are three boxes, one box of blue balls, one green and one mixed ,all labelled incorrectly. In how many trials will I label them correctly ?

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Q74. Suggest as many methods as possible for finding the nth largest element in an unsorted linked list

Ans.

Methods to find nth largest element in an unsorted linked list

  • Traverse the linked list and store elements in an array, sort the array and return the nth largest element

  • Use quickselect algorithm to find the nth largest element in O(n) time complexity

  • Implement a max heap and extract the nth largest element

  • Divide the linked list into smaller sublists and recursively find the nth largest element

  • Use merge sort to sort the linked list and return the nth largest element

Add your answer

Q75. Do you know Radix Sort? Where it is used? Radix sort can be applied in amazon.

Ans.

Radix sort is a sorting algorithm that sorts integers by processing individual digits from least significant to most significant.

  • Radix sort is a non-comparative sorting algorithm.

  • It sorts numbers by grouping them based on each digit's value.

  • It is commonly used for sorting strings in lexicographic order.

  • Radix sort has linear time complexity, making it efficient for large datasets.

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Q76. Networking Question

What happens when you type a URL in the web browser?

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Q77. what is hashing and how will you implement?

Ans.

Hashing is a process of converting data into a fixed-size numerical value called a hash code.

  • Hashing is used to quickly retrieve data from large datasets.

  • It is commonly used in data structures like hash tables and hash maps.

  • Hash functions should be fast, deterministic, and produce unique hash codes for different inputs.

  • Examples of hash functions include MD5, SHA-1, and SHA-256.

Add your answer
Q78. OOPS Question

OOPS contains 3 classes A,B,C and they are in multi level inheritance, was asked about the use of public, protected and private members of A in B and in C

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Q79. System Design Question

Design a Rate Limiter.

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Q80. What data structure do they use? Hash tables.

Ans.

Hash tables are a data structure that uses a hash function to map keys to values, providing efficient lookup, insertion, and deletion.

  • Hash tables use a hash function to convert keys into array indices.

  • They provide constant-time average case complexity for search, insert, and delete operations.

  • Collisions can occur when different keys map to the same index, which can be resolved using techniques like chaining or open addressing.

  • Examples of hash table implementations include Pyt...read more

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Q81. Explain the concepts of Object Oriented Programming

Ans.

Object Oriented Programming is a programming paradigm that uses objects to represent real-world entities.

  • Encapsulation: bundling data and methods that operate on that data within one unit

  • Inheritance: creating new classes from existing ones, inheriting their properties and methods

  • Polymorphism: ability of objects to take on multiple forms or behaviors

  • Abstraction: hiding complex implementation details and providing a simplified interface

  • Example: A car object can have properties ...read more

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Q82. Design classes for educational institutions in a city

Ans.

Design classes for educational institutions in a city

  • Identify the main entities: schools, students, teachers, courses

  • Create a School class with attributes like name, address, and a list of students and teachers

  • Create a Student class with attributes like name, age, and a list of courses

  • Create a Teacher class with attributes like name, specialization, and a list of courses

  • Create a Course class with attributes like name, duration, and a list of students and teachers

  • Establish rel...read more

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Q83. Application of Fibonacci series in day-to-day life.

Ans.

The Fibonacci series can be applied in day-to-day life for various purposes.

  • Financial planning: Fibonacci numbers can be used to calculate investment growth and determine optimal investment strategies.

  • Architecture and design: Fibonacci ratios can be used to create aesthetically pleasing designs and layouts.

  • Nature and biology: Fibonacci patterns can be observed in the growth of plants, arrangement of leaves, and formation of shells.

  • Music and art: Fibonacci sequences can be use...read more

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Q84. no of pairs between 1 and N satisfy relation pow(a,3)+pow(b,3)=pow(c,3)+pow(d,3).a,b,c,d<=N

Ans.

The question asks for the number of pairs between 1 and N that satisfy a specific mathematical relation.

  • The relation is pow(a,3) + pow(b,3) = pow(c,3) + pow(d,3)

  • The values of a, b, c, and d should be less than or equal to N

  • Count the number of pairs that satisfy the relation

Add your answer

Q85. find the and return if the given file path existing in the given file hierarcy(file system).

Ans.

Check if a given file path exists in the file system hierarchy and return the result.

  • Use file system APIs to check if the given file path exists in the hierarchy.

  • Traverse the file system hierarchy starting from the root directory to find the given file path.

  • Return true if the file path exists, false otherwise.

Add your answer

Q86. Show the abstraction and write code for function overriding

Ans.

Abstraction is hiding the implementation details, function overriding is providing a new implementation for a method in a subclass.

  • Abstraction involves hiding the complex implementation details and showing only the necessary features to the user.

  • Function overriding occurs in inheritance when a subclass provides a specific implementation for a method that is already defined in its superclass.

  • Example: Parent class 'Animal' has a method 'makeSound()', subclass 'Dog' overrides th...read more

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Q87. Give a few test cases for a bank transaction

Ans.

Test cases for a bank transaction

  • Transaction amount within account balance limit

  • Transaction amount exceeds account balance limit

  • Transaction to a valid account number

  • Transaction to an invalid account number

  • Transaction with correct transaction code

  • Transaction with incorrect transaction code

  • Transaction during bank working hours

  • Transaction outside bank working hours

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Q88. Given an array of numbers find the subset of numbers that give zero sum.

Ans.

Find subset of numbers in array that sum up to zero.

  • Use a nested loop to iterate through all possible subsets.

  • Calculate the sum of each subset and check if it equals zero.

  • Store the subset if the sum is zero.

  • Optimize the solution by using a hash set to store the cumulative sum of elements.

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Q89. Technical Question

Applications of Fibonacci series in real life

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Q90. Optimal path cost and path in a matrix . Dynamic programming

Ans.

Finding optimal path cost and path in a matrix using dynamic programming.

  • Dynamic programming is a technique to solve problems by breaking them down into smaller subproblems and solving them recursively.

  • In this case, we can use dynamic programming to find the optimal path cost and path in a matrix.

  • We can start by defining a 2D array to store the minimum cost of reaching each cell in the matrix.

  • Then, we can use a recursive function to calculate the minimum cost of reaching the ...read more

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Q91. Basic HR Question

Q1. Firstly was asked about the subjects I'm studying this semester
Q2. Different questions about my projects

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Q92. What you do if the customer is not happy for genivan cause?

Ans.

Listen to their concerns, apologize, offer a solution, and follow up to ensure satisfaction.

  • Listen actively to their concerns and empathize with their situation.

  • Apologize for any inconvenience caused and take responsibility for the issue.

  • Offer a solution that addresses their concerns and meets their needs.

  • Follow up with the customer to ensure their satisfaction and address any further concerns.

  • Document the issue and the steps taken to resolve it for future reference.

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Q93. JavaScript

// level: basic// tags: closures// implement a sum functionsum(4)(5) // 9// expected output const sum = x => y => x + y ,Debouncing.

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Q94. Common puzzle- There are three boxes,one box of blue balls, one green and one mixed ,all labelled incorrectly. In how many trials will i label them correctly...

read more
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Q95. Program to implement Dijkstra’s algorithm

Ans.

Dijkstra's algorithm finds the shortest path between nodes in a graph.

  • Create a graph with nodes and edges

  • Assign a tentative distance to each node

  • Set the initial node as current and mark it visited

  • For each neighbor of the current node, calculate the tentative distance

  • If the tentative distance is less than the current distance, update the distance

  • Mark the current node as visited and select the unvisited node with the smallest tentative distance

  • Repeat until the destination node ...read more

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Q96. There are 10 weights of which two weigh less than the others. Using a balance how will i identify the defective ones...

read more
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Q97. How many A4 sheets are sold in India per day?

Ans.

It is impossible to accurately determine the number of A4 sheets sold in India per day.

  • There is no centralized data on the sales of A4 sheets in India.

  • The number of A4 sheets sold can vary greatly depending on the region and industry.

  • Factors such as digitalization and environmental concerns may also impact sales.

  • Estimates or projections may be available from specific companies or industries.

  • Market research firms may have data on the overall paper market in India.

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Q98. A recursive program to print numbers in ascending order

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Q99. Program to reverse a singly linked list

Ans.

A program to reverse a singly linked list

  • Create a new empty linked list

  • Traverse the original linked list and insert each node at the beginning of the new list

  • Return the new list

Add your answer

Q100. Give examples of abstraction and polymorphism

Ans.

Abstraction is hiding implementation details while polymorphism is using a single interface for multiple types.

  • Abstraction: Encapsulation, Interfaces, Abstract classes

  • Polymorphism: Method Overloading, Method Overriding, Interfaces

  • Abstraction Example: Car - we don't need to know how the engine works to drive it

  • Polymorphism Example: Animal - different animals have different sounds but they all have a 'makeSound' method

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