UnitedHealth Interview Questions, Process, and Tips

Round duration - 60 minutes
Round difficulty - Medium

This was a technical Interview round with questions on C#, .NET and DBMS.

Q1. What is the difference between the Ref and Out keywords in C#?
Ans. 
Ref is used for passing arguments by reference, Out is used for returning multiple values.
• Ref keyword is used for passing arguments by reference, allowing the method to modify the original value.

• Out keyword is used for returning multiple values from a method, as it does not require the variable to be initialized before being passed.
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Q2. What is the difference between ViewData, ViewBag, and TempData in C#?
Ans. 
ViewData, ViewBag, and TempData are ways to pass data between controllers and views in ASP.NET MVC.
• ViewData is a dictionary object used to pass data from controller to view. It requires typecasting.

• ViewBag is a dynamic property used to pass data from controller to view. No typecasting is required.

• TempData is a dictionary object used to pass data from one controller to another or from one action to another.
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Q3. What is the difference between managed and unmanaged code in C#?
Ans. 
Managed code is executed by the CLR with memory management, while unmanaged code is executed directly by the operating system without memory management.
• Managed code is executed by the Common Language Runtime (CLR) in .NET framework.

• Unmanaged code is executed directly by the operating system without CLR.

• Managed code provides automatic memory management through garbage collection.

• Unmanaged code requires manual memory man...read more
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Q4. What are the different types of triggers in SQL Server?
Ans. 
Triggers in SQL Server are special types of stored procedures that are automatically executed when certain events occur in a database.
• Types of triggers include DML triggers (for INSERT, UPDATE, DELETE operations), DDL triggers (for CREATE, ALTER, DROP operations), and Logon triggers.

• Triggers can be set to fire before or after the triggering event.

• Examples of triggers include auditing changes to a table using an INSERT ...read more
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Q5. What are generic and non-generic collections in C#?
Ans. 
Generic collections in C# allow for type-safe collections, while non-generic collections do not enforce type safety.
• Generic collections use type parameters to specify the type of elements they can contain, ensuring type safety.

• Non-generic collections do not specify the type of elements they can contain, leading to potential runtime errors if incorrect types are used.

• Example of generic collection: List<string> nam...read more
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Round duration - 30 minutes
Round difficulty - Easy

This was a typical managerial round.

Round duration - 60 minutes
Round difficulty - Easy

There were 30 MCQ questions and 2 coding problems. The MCQs were medium-level questions. Coding problems were fairly easy.

Q1. 
Reverse Linked List Problem Statement
Given a singly linked list of integers, return the head of the reversed linked list.
Example:
Initial linked list: 1 -> 2 -> 3 -> 4 -> NULL
Reversed link...read more
Ans. 
Reverse a singly linked list of integers and return the head of the reversed linked list.
• Iterate through the linked list and reverse the pointers to point to the previous node.

• Update the head of the reversed linked list as the last node encountered.

• Ensure to handle edge cases like empty list or single node list.

• Time complexity should be O(N) and space complexity should be O(1).
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Round duration - 50 minutes
Round difficulty - Medium

The interview was scheduled by the placement cell in the evening. The interviewer seemed to be an experienced developer.
He asked me general background questions like what are you interested most in? what are your technical interests? etc.
He then asked me about my project. Explained him well on that front and he seemed satisfied. He asked me to find the Lowest Common Ancestor of a given Binary Search Tree. I solved it in around 20-30 minutes and he finally asked me to write the solution on paper. He asked some practical OOPs problems for a while and I answered correctly but the explanations could be more thorough.

Q1. 
LCA of Binary Tree Problem Statement
You are given a binary tree consisting of distinct integers and two nodes, X and Y. Your task is to find and return the Lowest Common Ancestor (LCA) of these two nodes...read more
Ans. 
Find the Lowest Common Ancestor (LCA) of two nodes in a binary tree.
• Traverse the binary tree to find the paths from the root to each node, then compare the paths to find the LCA.

• Use recursion to traverse the tree efficiently and find the LCA.

• Handle cases where one node is an ancestor of the other node.

• Consider edge cases like when one or both nodes are not present in the tree.

• Optimize the solution to achieve the desire
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Round duration - 30 minutes
Round difficulty - Easy

The interview was some 30 minutes after the technical round. The HR asked me general questions like my hobbies, technical and non-technical things in my resume, my interests, etc. The overall communication was very friendly.