Happiest Minds Technologies SDE Interview Questions and Answers

Q1. What is HashMap working?
Ans. 
HashMap is a data structure that stores key-value pairs and allows for fast retrieval of values based on keys.
• HashMap uses hashing to store and retrieve key-value pairs efficiently.

• Keys in a HashMap must be unique, but values can be duplicated.

• HashMap allows for null keys and null values.

• Example: HashMap map = new HashMap<>(); map.put("apple", 5); int value = map.get("apple");
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2 leetcode medium level type problems were given. This was a cut-off test were majority will be cut-off.

Long coding round - Paired with another thoughtworker

Q1. Questions on project
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Q2. Frameworks related
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Deep coding knowledge required

Some mcq questions and coding question. Both where easy to medium level. Prepare combination/permutation/Time complexity etc

A question related to Binary search and some other follow ups.

Q1. Why did we hired you
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Q2. What is next 5 years see your self
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Q1. Explain random forest
Ans. 
Random forest is an ensemble learning method that builds multiple decision trees and merges them to improve accuracy and prevent overfitting.
• Random forest is a type of ensemble learning method.

• It builds multiple decision trees during training.

• Each tree is built using a subset of the training data and a random subset of features.

• The final prediction is made by averaging the predictions of all the individual trees.

• Random...read more
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Q2. What is boosting
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Boosting is a machine learning ensemble technique where multiple weak learners are combined to create a strong learner.
• Boosting is an iterative process where each weak learner is trained based on the errors of the previous learners.

• Examples of boosting algorithms include AdaBoost, Gradient Boosting, and XGBoost.

• Boosting is used to improve the accuracy of models and reduce bias and variance.
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Coding test contains 4 coding question easy to medium, Topic Array, String but DSA questions are in image formate first you have to decode the image then code.

Q1. Some question from resume project.
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Q2. How we can improve this project
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Q3. Add 20% discount code, Implement cashback
Ans. 
To add a 20% discount code and implement cashback in an application.
• Create a discount code field in the application where users can enter the code to avail 20% off.

• Calculate the discounted price by applying the 20% discount on the original price.

• Implement a cashback feature where users receive a certain percentage of the purchase amount back as cashback.

• Ensure that the cashback amount is credited to the user's account
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Typing test 40 WPM and Grammar

Q1. Where do you see yourself in this company in next 2 years ?
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Q2. What is the role of a customer service
Ans. 
The role of customer service is to assist customers with their inquiries, concerns, and issues to ensure a positive experience.
• Providing assistance and support to customers

• Resolving customer complaints and issues

• Answering customer inquiries and providing information

• Ensuring customer satisfaction and retention

• Building positive relationships with customers
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