Razorpay SDE (Software Development Engineer) Interview Questions and Answers

Q1. Number of Islands
Ans. 
Count the number of islands in a 2D grid.
• Iterate through the grid and for each '1', perform a depth-first search to mark all connected '1's as visited.

• Increment the count of islands for each new '1' encountered.

• Return the total count of islands.
Answered by AI
Add your answer
Q2. Coin change problem
Ans. 
The coin change problem involves finding the minimum number of coins needed to make a certain amount of change.
• Use dynamic programming to solve the problem efficiently

• Start with a base case where the amount of change is 0

• Iterate through each coin denomination and calculate the minimum number of coins needed for each amount of change

• Store the results in a table and use them to calculate the minimum number of coins for l
Answered by AI
Add your answer

Q1. Javascript based questions
Add your answer

Q1. Discussion with a senior manager
Add your answer

3 coding question 1 SQL query

Q1. Question about tree check tree is bst or not ?write code on it
Add your answer
Q2. Array question find 1st repeated element in o(n).
Ans. 
Find the first repeated element in an array of strings in O(n) time complexity.
• Create a hash table to store the frequency of each element.

• Traverse the array and check if the element is already present in the hash table.

• If it is present, return the element as the first repeated element.

• If no element is repeated, return null or -1.

• Example: ['apple', 'banana', 'orange', 'apple'] => 'apple'
Answered by AI
Add your answer

Q1. Multiple of big integers and find complexity
Ans. 
Question about finding complexity of multiplying big integers.
• Big integers require more memory and processing power than regular integers.

• Multiplying two n-digit integers takes O(n^2) time using the standard algorithm.

• There are faster algorithms like Karatsuba and FFT which have lower complexity.

• The complexity of multiplying two n-digit integers using Karatsuba algorithm is O(n^log2(3)).

• The complexity of multiplying tw...read more
Answered by AI
Add your answer

Q1. Where do you see yourself in 5 years?
Add your answer
Q2. What are your strengths and weaknesses?
Add your answer
Q3. Tell me about yourself.
Add your answer

Q1. Explain the react lifecycle functions and how they work
Ans. 
React lifecycle functions are methods that are automatically called at specific points in a component's life cycle.
• Mounting: constructor, render, componentDidMount

• Updating: render, componentDidUpdate

• Unmounting: componentWillUnmount
Answered by AI
Add your answer
Q2. Css box model, difference between padding and margin
Ans. 
Padding is the space inside the border of an element, while margin is the space outside the border.
• Padding is used to create space between the content and the border of an element.

• Margin is used to create space between the border of an element and other elements.

• Padding affects the size of the content area, while margin affects the positioning of the element.

• Example: padding: 10px will create 10 pixels of space inside ...read more
Answered by AI
Add your answer

Q1. What are your salary expectations in CTC and variables?
Add your answer
Q2. Will you relocate to the location required?
Add your answer

Q1. WHAT IS OOPS, INHERITANCE, STATIC DYNAMIC BINDING
Ans. 
OOPS is Object-Oriented Programming, Inheritance is the ability of a class to inherit properties and behavior from another class, Static Binding is resolved at compile time, Dynamic Binding is resolved at runtime.
• OOPS stands for Object-Oriented Programming, which is a programming paradigm based on the concept of objects.

• Inheritance is a feature in OOP that allows a class to inherit properties and behavior from another ...read more
Answered by AI
Add your answer

75 min test with 18 Java theory questions

Q1. Synchronized keyword usage
Ans. 
The synchronized keyword in Java is used to control access to shared resources in a multithreaded environment.
• Synchronized keyword can be used to synchronize access to critical sections of code to prevent race conditions.

• It can be applied to methods or code blocks to ensure only one thread can access them at a time.

• Example: synchronized void myMethod() { // code }

• Example: synchronized(this) { // code }
Answered by AI
Add your answer
Q2. Message Queue types
Add your answer
Q3. Thread Contention
Add your answer
Q4. Java Profiling Tools
Add your answer
Q5. Abstract classes
Add your answer

1 hour, the coding test was based on a project given to us

Q1. Detailed questionnaire on React
Add your answer
Q2. Problem solving based on array manipulations
Add your answer

Q1. Binary search algo quetion
Add your answer

Q1. One leetcode easy-medium problem
Add your answer
Q2. Java, springboot and oops question
Add your answer

Q1. Project related questions
Add your answer
Q2. System design questions
Add your answer