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Quantiphi Analytics Solutions Private Limited Software Developer Interview Questions and Answers

Updated 12 Dec 2024

Q1. Fruits and Baskets Problem Statement

You are given 'n' fruit trees planted along a road, numbered from 0 to n-1. Each tree bears a fruit type represented by an uppercase English alphabet. A Ninja walking along ...read more

Ans.

The problem is to find the maximum number of fruits the Ninja can put in both baskets after satisfying given conditions.

  • The Ninja can start at any tree and end at any tree, but cannot skip a tree.

  • He can pick one fruit from each tree until he cannot, i.e., when he has to pick a fruit of the third type.

  • The restriction is that each basket can have only one type of fruit.

  • We need to find the maximum number of fruits that can be put in both baskets.

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Q2. Sort 0 1 2 Problem Statement

Given an integer array arr of size 'N' containing only 0s, 1s, and 2s, write an algorithm to sort the array.

Input:

The first line contains an integer 'T' representing the number of...read more
Ans.

The problem requires sorting an array of 0s, 1s, and 2s in a single scan.

  • Use three pointers to keep track of the positions of 0s, 1s, and 2s.

  • Initialize the low pointer at the beginning of the array and the high pointer at the end.

  • Iterate through the array using a current pointer and swap elements based on their values.

  • Move the pointers accordingly until the array is sorted.

  • The time complexity of this solution is O(N) as we only iterate through the array once.

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Q3. What is treeset and weakhashmap?

Ans.

TreeSet is a sorted set implementation in Java. WeakHashMap is a hash table-based Map implementation with weak keys.

  • TreeSet is implemented using a tree structure and maintains elements in sorted order.

  • WeakHashMap is a Map implementation that allows keys to be garbage collected when they are no longer referenced.

  • WeakHashMap is useful for caching or memoization where the keys are not always needed and can be garbage collected to free up memory.

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Q4. What is comparable and comparator?

Ans.

Comparable and Comparator are interfaces used for sorting objects in Java.

  • Comparable interface is used to define the natural ordering of objects based on their own class.

  • Comparator interface is used to define the ordering of objects based on a separate class.

  • Comparable interface has compareTo() method while Comparator interface has compare() method.

  • Comparable interface is implemented by the class whose objects need to be sorted while Comparator interface is implemented by a s...read more

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Q5. oops concept, explain each of them

Ans.

Object-oriented programming concepts that help in organizing and structuring code.

  • Encapsulation: Bundling data and methods that operate on the data into a single unit (class).

  • Inheritance: Allowing a class to inherit properties and behavior from another class.

  • Polymorphism: Ability to present the same interface for different data types.

  • Abstraction: Hiding the complex implementation details and showing only the necessary features of an object.

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Q6. REST API for User CRUD

Ans.

Design a RESTful API for CRUD operations on user resources.

  • Use HTTP methods like GET, POST, PUT, DELETE for CRUD operations

  • Create endpoints like /users for listing all users, /users/{id} for specific user

  • Use status codes like 200 for success, 404 for not found, 400 for bad request

  • Implement authentication and authorization mechanisms for security

  • Include request and response body formats like JSON or XML

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Interview Process at Quantiphi Analytics Solutions Private Limited Software Developer

based on 8 interviews
3 Interview rounds
Aptitude Test Round
Coding Test Round
HR Round
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