BNY Full Stack Developer Interview Questions, Process, and Tips

Round duration - 90 minutes
Round difficulty - Medium

The test happened at 9 PM, and the duration was of 90 mins. The test was held on Codility platform.

Q1. Reach the destination
Given a source point (sx, sy) and a destination point (dx, dy), the task is to check if it is possible to reach the destination point using the following valid moves:
(a, b) -> (a...read more
Ans. Brute force approach
The naive approach to solve this problem is to consider each and every possible move until we reach the destination.
 
This can be done using recursion. Below is the algorithm:
 
• Check for the bases:
  • If the source and destination coordinates are the same, return true.
  • Return false, if the x (or y) coordinate of source point is greater than the x (or y) coordinate of the destination point. As the...read more
Answered by CodingNinjas
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Q2. Circular Move
You have a robot currently standing at the origin (0, 0) of a two-dimensional grid and facing north direction. You are given a sequence of moves for the robot in the form of a string of size...read more
Ans. Optimal Approach
Initialize a variable ‘direction’ with 0 which means that the robot is initially facing towards the north.
direction: 0 -> Robot is facing towards the North
direction: 1 -> Robot is facing towards the West 
direction: 2 -> Robot is facing towards the South 
direction: 3 -> Robot is facing towards the West
 
Initialize two variables ‘x’ and ‘y’ as 0. They will represent the position ...read more
Answered by CodingNinjas
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Q3. Buy and Sell Stock
You are Harshad Mehta’s friend. He told you the price of a particular stock for the next ‘N’ days. You can either buy or sell a stock. Also, you can only complete at most 2-transactions....read more
Ans. Recursion
This problem can be solved by solving its subproblems and then combining the solutions of the solved subproblems to solve the original problem. We will do this using recursion.
Basically, we have to buy the stock at the minimum possible price and sell at the maximum possible price, keeping in mind that we have to sell the stock before buying it again.
 
 
Below is the detailed algorithm: 
 
1. Call ...read more
Answered by CodingNinjas
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Round duration - 45 minutes
Round difficulty - Easy

The timing for this round was around 10 AM. How to optimize website assets loading? Explain Hoisting in javascript.

Q1. Number Of Pairs With Given Sum
You have been given an integer array/list(arr) and a number 'Sum'. Find and return the total number of pairs in the array/list which when added, results equal to the ...read more
Ans. Brute Force Approach
• Initialize the ans = 0
• Run two loops first from i = 0 to n-1 and second from j = i+1 to  n-1 and if arr[i] + arr[j] == Sum then increase the ans by 1.
• Return ans
Space Complexity: O(1)Explanation:
O(1)
 
As constant extra space is used.
Time Complexity: O(n^2)Explanation:
O(N^2), where N is the size of the array.

As we are running two nested loops of size N.
Answered by CodingNinjas
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Round duration - 30 minutes
Round difficulty - Easy

This was a problem solving round and consisted of puzzles and mathematical problems.

Q1. Puzzle
A man fell in a 50m deep well. He climbs 4 meters up and slips 3 meters down in one day. How many days would it take for him to come out of the well?
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Q2. Puzzle
Suppose you take 5 mins to think for a coding task, another 10 mins to code where you write 100 lines of code. You take a break of 5 mins every 10 mins. How much lines of code will you have written a...read more
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Q3. Puzzle
There is a room with a door (closed) and three light bulbs. Outside the room, there are three switches, connected to the bulbs. You may manipulate the switches as you wish, but once you open the door...read more
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Q4. Puzzle
You are given Rs 100 every week. Every day you put Rs 5 in you piggy bank except on Sunday you put Rs 10. You take a bus to college, one side trip costs Rs 4, you do 2 trips a day. You have your lunc...read more
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Q1. They grind u in javascript,typescript
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Q2. Html css, angular
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Q3. Deep preparation needed
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Question Related to the DP and the Graph

Q1. Kth Max Element in a Array
Ans. 
Find the Kth maximum element in an array of strings.
• Sort the array in descending order.

• Return the element at index K-1.
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Q2. Coin Change and optimization through DP
Ans. 
Coin change problem can be solved using dynamic programming to find the minimum number of coins needed to make a certain amount of change.
• Use dynamic programming to build up solutions for smaller subproblems

• Start by initializing an array to store the minimum number of coins needed for each amount from 0 to the target amount

• Iterate through each coin denomination and update the array with the minimum number of coins need
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Q1. Project include in your Resume
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Q2. HR common question
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MCQ test consisting of 70 mcqs in 75 minutes from aptitude english and cs fundamentals. If cleared next paper 2 coding qs medium level

Q1. Two sum leetcode problem
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Q2. What problems you faced in your project
Ans. 
I faced challenges with integrating third-party APIs and debugging complex logic.
• Difficulty in understanding and implementing third-party APIs

• Issues with data synchronization between different systems

• Troubleshooting complex logic errors

• Managing dependencies and version conflicts

• Time constraints affecting problem-solving
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Q1. OOP basic about the concept
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Q2. Ms Sql based sql queries
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Q1. How exception handing in api
Ans. 
Exception handling in API involves catching and handling errors that occur during API execution.
• Use try-catch blocks to catch exceptions and handle them appropriately

• Throw custom exceptions to provide meaningful error messages to API consumers

• Use status codes to indicate the outcome of API requests (e.g. 200 for success, 400 for client errors, 500 for server errors)

• Log exceptions to track errors and troubleshoot issues

• ...read more
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Q2. Code for multiplication table
Ans. 
Code to generate a multiplication table in a programming language
• Use nested loops to iterate through rows and columns

• Print the product of row and column for each cell

• Consider formatting the output for better readability
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DP graphs strings it was good

Q1. Reverse a linkded list
Ans. 
Reverse a linked list by changing the direction of pointers
• Start with three pointers: current, previous, and next

• Iterate through the list, updating pointers to reverse the direction

• Return the new head of the reversed list
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Q2. Print fibonacci series
Ans. 
The Fibonacci series is a sequence of numbers where each number is the sum of the two preceding ones.
• Start with two variables initialized to 0 and 1

• Loop through desired number of iterations, adding the previous two numbers to get the next number

• Print or store each number in the series
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Logical,quants,coding

Q1. Java,sql,testing,sdlc
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Q2. What is method overriding?
Ans. 
Method overriding is a feature in object-oriented programming where a subclass provides a specific implementation of a method that is already provided by its parent class.
• In method overriding, the method in the subclass has the same name, return type, and parameters as the method in the parent class.

• The purpose of method overriding is to provide a specific implementation of a method in the subclass that is different fr...read more
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Q3. What is exception handling in java?
Ans. 
Exception handling in Java is a mechanism to handle runtime errors and prevent program crashes.
• Exceptions are objects that represent errors or unexpected events during program execution.

• Java provides try, catch, and finally blocks to handle exceptions.

• try block contains the code that may throw an exception, catch block handles the exception, and finally block is executed regardless of an exception.

• Example: try { // cod...read more
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Q1. Normal questions
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Q2. Why you want to join our company?
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