Infosys Round 2 Preparation 2026 – Coding, Interview & Most Important Patterns

Preparing for Infosys Round 2 can feel confusing because there is a lot of material available online. The better approach is not to study everything at once, but to build a practical preparation order around the skills that are most useful for the coding assessment and the technical interview.

This guide is designed as a focused preparation resource for candidates who have reached the next stage of an Infosys hiring process. It combines coding-pattern revision with SQL, Computer Science fundamentals, resume preparation and basic system-design preparation. The goal is to help you decide what to study first, what to revise later and how to explain your answers during an interview.

The preparation areas below are based on the accompanying preparation material and are intended as a study framework rather than a guaranteed prediction of a particular assessment. Hiring processes, question difficulty and evaluation criteria can vary between drives, batches and roles.

Infosys Round 2 Preparation – What Should You Prepare?

The biggest mistake during last-minute preparation is trying to complete hundreds of unrelated DSA problems. A more useful strategy is to understand common problem-solving patterns and then practice a small number of representative questions from each pattern.

The recommended coding priority in the preparation guide is:

• Dynamic Programming
• Greedy Algorithms
• Sliding Window
• Two Pointers
• Bit Manipulation
• Trees
• Graphs

Do not treat this order as a fixed cutoff or a guarantee of what will appear. Use it as a revision sequence. For every topic, try to understand the pattern, identify when it should be used, solve a few problems without looking at the solution and then review your mistakes.

Most Important Coding Patterns for Infosys Round 2

1. Dynamic Programming – Highest Priority

Dynamic Programming is an important part of the preparation framework because it tests whether you can break a larger problem into smaller overlapping subproblems. Instead of memorizing individual solutions, learn how to identify a state, transition and base case.

Useful DP patterns to revise include:

• 0/1 Knapsack and Subset Sum
• Partition Equal Subset Sum
• Target Sum
• Coin Change
• Longest Common Subsequence
• Longest Palindromic Subsequence
• Longest Increasing Subsequence
• Edit Distance
• House Robber
• Decode Ways
• Word Break
• Jump Game
• Frog Jump

A good way to revise DP is to first solve a problem recursively, understand the repeated work and then convert the idea into memoization or tabulation. Pay attention to time and space complexity because an interviewer may ask why your optimized solution is better than brute force.

2. Greedy Algorithms

Greedy problems require you to make a locally useful choice while maintaining a path toward the global objective. The important part is not simply knowing the answer; you should be able to explain why the greedy choice is safe.

Revise problems such as:

• Jump Game
• Jump Game II
• Gas Station
• Partition Labels
• Best Time to Buy and Sell Stock II

When practicing greedy problems, ask yourself whether the current choice can ever prevent an optimal solution later. This habit is more valuable than memorizing a particular implementation.

3. Sliding Window

Sliding Window is useful for array and string problems where a contiguous range needs to be maintained efficiently. Learn the difference between fixed-size and variable-size windows and understand when a frequency map or counter is required.

Important practice problems include:

• Longest Substring Without Repeating Characters
• Minimum Size Subarray Sum
• Longest Repeating Character Replacement
• Permutation in String
• Minimum Window Substring

During practice, concentrate on the condition that makes the window expand or shrink. Many mistakes happen because candidates know the template but cannot identify the correct condition.

4. Two Pointers

Two Pointers can reduce unnecessary nested loops in sorted arrays and string problems. Learn when two indices should move toward each other and when they should move in the same direction.

Useful questions include:

• Two Sum II
• 3Sum
• Container With Most Water
• Sort Colors
• Remove Duplicates from Sorted Array

For every solution, state the reason for moving the left or right pointer. This makes your explanation much clearer in an interview.

5. Bit Manipulation

Bit Manipulation can look difficult initially, but a small collection of patterns covers many common questions. Revise XOR, set-bit operations and common bit checks before moving to more advanced bitmasking problems.

• XOR
• n & (n-1)
• Counting set bits
• Bitmasking basics
• Odd/even checks

Also practice Single Number, Missing Number, Number of 1 Bits, Counting Bits and Power of Two.

Trees & Graphs for Infosys Coding Preparation

After completing the higher-priority patterns, revise the fundamentals of Trees and Graphs. You do not need to memorize dozens of implementations. Make sure you can write and explain standard traversals and understand the difference between BFS and DFS.

Important areas include:

• Inorder, Preorder and Postorder Traversals
• Level Order Traversal
• Tree Height and Diameter
• Lowest Common Ancestor
• BST Operations
• BFS and DFS
• Connected Components
• Cycle Detection
• Shortest Path Basics

For graphs, practice representing a graph using an adjacency list and understand visited arrays or sets. For trees, be comfortable writing recursive traversal code and explaining the complexity.

Infosys Round 2 Coding Strategy

Before starting a coding assessment, quickly scan all available questions if the test format allows it. Classify them mentally by difficulty and by the pattern they appear to use. Starting with a question you understand can help you secure a complete solution before spending time on a harder problem.

Your first objective should be a fully working solution. A correct solution with appropriate complexity is more useful than several unfinished attempts. Once the first problem is stable, use the remaining time to improve or attempt another question.

Do not spend most of your test time repeatedly debugging one approach without reassessing it. If the constraints suggest that an O(n²) solution will not work, step back and look for a better pattern.

Infosys Wingspan Interview Preparation

Clearing a coding assessment does not mean the next stage will necessarily be limited to HR questions. Candidates preparing for technical roles should be ready to discuss coding, Computer Science fundamentals, SQL, projects and their resume. System Design may also be useful for candidates targeting higher technical roles.

The preparation material describes the coding section as requiring strong problem-solving ability and recommends the following revision order:

DP → Greedy → Sliding Window → Two Pointers → Bit Manipulation → Trees → Graphs

More importantly, practice explaining your solution aloud. An interview is different from solving privately because the interviewer also needs to understand how you reached your answer.

5-Part Framework for Explaining Coding Solutions

Use this simple structure whenever you are asked to solve a coding problem:

1. Brute Force: Explain the straightforward approach and its complexity.
2. Observation: Identify the important property or pattern.
3. Optimization: Explain how the observation improves the solution.
4. Complexity: State time and space complexity clearly.
5. Edge Cases: Discuss empty input, one element, duplicates, negative values, maximum constraints and unusual input ordering where relevant.

This framework prevents your explanation from becoming a collection of disconnected statements. It also gives the interviewer a clear view of your reasoning process.

SQL Questions to Prepare for Infosys Interview

Do not prepare only DSA. SQL is an important practical skill for software and technology roles, and candidates should be comfortable writing basic queries as well as explaining how joins and aggregation work.

Revise:

• SELECT and WHERE
• GROUP BY and HAVING
• ORDER BY
• Aggregate Functions
• INNER JOIN
• LEFT JOIN
• Multiple JOINs
• Subqueries and CTEs
• Window Functions
• ROW_NUMBER()
• RANK()
• DENSE_RANK()

Practice classic interview-style tasks such as finding the second-highest salary, finding the highest salary in each department, identifying duplicate records, finding employees whose salary is above their department average and finding the nth-highest salary.

While practicing, do not focus only on getting the expected output. Understand why a JOIN is required, why GROUP BY changes the result and when a window function is preferable to a grouped query.

Core CS Subjects for Infosys Interview

Technical interviews can move from coding into fundamentals very quickly. Keep your revision focused on concepts that you can explain with simple examples rather than trying to read an entire textbook again.

DBMS

• Normalization
• ACID properties
• Transactions
• Keys
• Indexing
• Joins
• Primary Key vs Foreign Key
• DELETE vs TRUNCATE vs DROP

OOP

• Encapsulation
• Inheritance
• Polymorphism
• Abstraction
• Overloading vs Overriding
• Interface vs Abstract Class
• SOLID basics

Operating Systems

• Process vs Thread
• Deadlock
• CPU Scheduling
• Paging
• Virtual Memory
• Synchronization
• Context Switching

Computer Networks

• TCP vs UDP
• HTTP vs HTTPS
• OSI Model
• IP addressing basics
• DNS
• REST APIs
• HTTP Status Codes

A useful revision technique is to prepare a one- or two-minute explanation for each major concept. If you cannot explain a concept without reading notes, revise it again.

System Design for Infosys SP Candidates

Candidates targeting more advanced technical roles should understand basic system-design concepts. The preparation guide recommends starting with the simple architecture:

Client → API → Server → Database

Then gradually revise:

• Load Balancers
• Caching
• API Gateways
• Message Queues
• Database Selection
• Authentication and Authorization
• Horizontal vs Vertical Scaling
• SQL vs NoSQL
• Rate Limiting

You can practice explaining a URL shortener, food-delivery application, online bookstore, ride-booking system or chat application. The objective is not to produce an extremely complicated architecture. Instead, learn how to identify users, APIs, data, bottlenecks and scaling requirements.

Prepare Your Resume & Projects

One of the most overlooked parts of interview preparation is the candidate's own resume. Anything you mention can become a follow-up question.

If your resume contains Java, Python, AWS, React, Android, Flutter, REST APIs, databases or machine-learning projects, be ready to explain what you personally built and why you selected those technologies.

For every major project, prepare answers to these seven questions:

1. What problem does your project solve?
2. Why did you build it?
3. What technologies did you use?
4. What was your individual contribution?
5. What was the biggest technical challenge?
6. How did you solve that challenge?
7. How would you improve or scale the project?

A strong project explanation should include at least one real technical decision. For example, explain why you selected a particular database, how authentication works, how you handled an API failure or how you improved performance. Avoid presenting a project as a list of technologies.

Infosys Round 2 Last-Minute Preparation Order

If you have only a few days left, use a structured plan instead of switching randomly between topics.

Coding Assessment Roadmap:

1. Dynamic Programming
2. Greedy
3. Sliding Window
4. Two Pointers
5. Bit Manipulation
6. Trees
7. Graphs

Interview Roadmap:

1. Coding problems
2. SQL
3. DBMS
4. OOP
5. Operating Systems
6. Resume and Projects
7. System Design for relevant roles
8. HR and Behavioral Questions

The most useful way to follow this roadmap is to combine learning with active practice. For example, after revising Sliding Window, immediately solve two or three representative problems without looking at the solution. Then write down the mistake you made and revisit that pattern later.

How to Use Your Final 24 Hours

If your assessment or interview is very close, avoid starting completely new advanced topics. Instead, review the patterns you already know and make sure you can implement them without depending on notes.

For coding, revise templates and common edge cases. For SQL, practice joins, aggregation and window functions. For DBMS, OOP and OS, review definitions and prepare simple examples. For your resume, read every line and make sure you can explain every technology, project and achievement mentioned there.

Do not sacrifice all your sleep for another long list of practice questions. A clear mind helps with reading constraints, choosing an approach and communicating during an interview.

Important Note About Infosys Cutoffs and Hiring Process

Preparation benchmarks should not be treated as guaranteed cutoffs. The number of questions required to progress can vary depending on the hiring drive, assessment difficulty, role, candidate pool and evaluation process.

Similarly, interview experiences shared by candidates should be used as preparation references rather than promises about what every candidate will face. Your assessment may contain different questions or your interview may follow a different sequence.

The safest strategy is therefore to prepare the underlying skills instead of preparing only for a predicted question or cutoff.

Frequently Asked Questions

What should I prepare first for Infosys Round 2?

Start with the major coding patterns: Dynamic Programming, Greedy, Sliding Window, Two Pointers and Bit Manipulation. Then revise Trees and Graphs. After coding preparation, move to SQL and core CS subjects.

Which DSA topics are included in this preparation guide?

The guide focuses on DP, Greedy, Sliding Window, Two Pointers, Bit Manipulation, Trees and Graphs. It also provides representative problem types for each area.

Should I prepare SQL for the Infosys interview?

Yes. Revise joins, aggregation, subqueries, CTEs and window functions, and practice common interview queries such as second-highest salary and duplicate records.

Should I prepare DBMS, OOP and OS?

Yes. These are included in the interview preparation framework. Focus on fundamentals and be able to explain each concept using a practical example.

Is System Design required for every candidate?

The preparation material gives particular importance to System Design for candidates targeting higher-level technical roles. Candidates should adjust the depth of preparation according to the role they are pursuing.

Are these guaranteed Infosys questions?

No. This page is a preparation resource, not a guarantee of future assessment or interview questions. Hiring processes can change between drives.

How should I prepare if I have only a few days?

Prioritize patterns instead of trying to solve hundreds of problems. Revise coding first, then SQL, DBMS, OOP and OS. Finally, review your resume, projects and role-specific topics.

Final Preparation Checklist

• Can you identify the correct DSA pattern from a new problem?
• Can you explain brute force before presenting an optimized solution?
• Can you state time and space complexity?
• Can you handle common edge cases?
• Can you write joins and aggregation queries in SQL?
• Can you explain normalization, ACID, indexing and transactions?
• Can you explain OOP principles with examples?
• Can you differentiate processes and threads?
• Can you explain your projects without reading your resume?
• Can you describe one basic system from client to database?

If you can confidently answer most of these questions, your preparation is much more structured than simply collecting large numbers of “most repeated questions.”

Download the Infosys Last-Moment Preparation Guide 2026

If you want the accompanying preparation material, you can use the resource below. It covers the coding patterns, interview preparation, SQL, core CS subjects, projects and system-design areas discussed on this page.

📥 Preparation Guide:
Download Infosys Last-Moment Preparation Guide 2026

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About This Preparation Resource

This page is intended to provide a practical preparation framework for candidates preparing for Infosys-related coding and interview stages. The content is written to help candidates understand what to study, how to prioritize it and how to communicate their approach. It should be used alongside official communication received from Infosys and the instructions provided for the candidate's particular hiring process.

Hiring stages, assessment formats, role mapping and interview questions may change over time. Always check the latest official communication before making decisions based on an older candidate experience or preparation benchmark.