Wise Finserv Java Developer Interview Questions and Answers

DSA medium level questions were asked.

Q1. Design MakeMyTrip kind of application.
Ans. 
MakeMyTrip is a travel booking application that allows users to book flights, hotels, and holiday packages.
• Include features like flight/hotel search, booking, payment gateway integration, and user profiles.

• Implement filters for search results, reviews/ratings for hotels, and notifications for booking updates.

• Integrate maps for location tracking, weather forecasts, and customer support chatbot.

• Offer discounts, loyalty p...read more
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Q2. Oops based questions.
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70 minutes test, and 4 questions

Q1. Behavioural Queston
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Aptitude test question for credit Agricole company

Questions on Collections

Q1. 2 coding questions
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Q2. Questions on Collections
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Round duration - 70 Minutes
Round difficulty - Hard

The test link was active for a week, and you can give anytime you like. The IDE was very good and self explanatory. There were 2 coding questions and 15 aptitude questions.

Q1. 
Unweighted Graph Shortest Path Problem
You are tasked with finding the shortest path between two houses in the city of Ninjaland, represented as an unweighted graph. The city has N houses numbered from 1 ...read more
Ans. 
This is a straight forward application of Floyd Warshal algorithm
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Q2. 
Check If Two Nodes Are Cousins
You are given an arbitrary binary tree consisting of N nodes, where each node is associated with a certain value, and two node values, a and b. Your task is to determine if ...read more
Ans. 
This was a modified version of DFS on tree and storing the results in a dp to avoid recalculation.
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Round duration - 60 Minutes
Round difficulty - Medium

It contained two programming questions.

Q1. 
Counting Nodes in a Complete Binary Tree - Problem Statement
Given the root of a complete binary tree, calculate the total number of nodes in this tree.
A complete binary tree is defined as a binary tree...read more
Ans. 
The basic solution of this problem is easy. You just need to do a level order traversal of the tree and wherever you find the first vacant spot, you can enter the node there.
The trick was to find the optimal solution. You need to use the property of almost full binary tree. Knowing the value of the node to enter, you can directly eliminate one side of the tree and just traverse the other side of the tree.
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Q2. 
Rearrange Array Numbers for Largest Possible Number
Given an array ARR consisting of non-negative integers, rearrange the numbers to form the largest possible numerical value. You are not permitted to alt...read more
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This was a standard array manipulation problem. You just need to find the cases that should be satisfied by the second largest number.
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Round duration - 60 Minutes
Round difficulty - Medium

This was more of a interaction round with some technical skills.

Q1. Can you explain the ACID properties and the rollback mechanism in DBMS?
Ans. 
Tip 1 : Focus on the basics of DBMS 
Tip 2 : Try applying the DBMS concepts on the problems at hand.
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Tell me about a time where you resolve a conflict

Reverse a string, identify anagram

Q1. 1st round was virtual round basic queation of core java , design pattern, threading object creation singleton design pattern deep ,threading class level objevt level,collection differances java 8 stream...read more
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Q2. Singleton design implementation and deep dive into it
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Q3. Immutable implementation ,design classes interfaces with certain scenario
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Q1. Need to visit Nomura office
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Q2. Data structure questions arraylist linked list stack queue imple
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Q3. BFS related question
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Q4. Data structure related questions
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Round duration - 90 minutes
Round difficulty - Easy

Consisted of 3 DSA questions and MCQ on python proficiency

Q1. 
Palindromic Substrings Problem Statement
Given a string S, your task is to return all distinct palindromic substrings of the given string in alphabetical order.
Explanation:
A string is considered a pal...read more
Ans. 
Solved it using a mathematical score, got a partial score
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Round duration - 60 minutes
Round difficulty - Medium

It was a pure DSA round and interviewer was very helpful with providing significant hints to solve the given problems

Q1. 
Island Perimeter Calculation Problem
Given a binary grid representation of a map of an island, calculate the perimeter of the island. The grid uses '0' for water and '1' for land.
The grid has only one i...read more
Ans. 
Solved it using DFS over graph and calculating perimeter for each connected component.
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Round duration - 60 minutes
Round difficulty - Hard

DSA+OS

Q1. 
Clearing the Forest Problem Statement
Ninja lives in a city called Byteland where a festive event is being organized. To make space for this event, Ninja is tasked with clearing a nearby forest. The fores...read more
Ans. 
Change the (x,y) coordinates into parametric coordinates, and then apply sliding window.
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