Service-Based DSA Interview Master

120+ Interview-Focused DSA Problems for Service-Based Companies

Preparing for TCS, Infosys, Wipro, Accenture, Cognizant, Capgemini, HCLTech or Tech Mahindra?

Instead of randomly solving hundreds of DSA problems, use a structured, company-focused practice list.

This PDF is designed to help students understand what to practice, where to practice it, which topics matter, and how to prepare systematically.

WHAT YOU GET

✅ 120+ carefully selected DSA problems

✅ Direct clickable links to practice each problem

✅ Topic-wise organization

✅ Easy / Medium / Hard difficulty

✅ Company association for major service-based companies

✅ Reported interview questions clearly identified

✅ High-value preparation questions separately identified

✅ Company-wise preparation strategy

✅ 5-phase DSA preparation roadmap

✅ 40-problem Fast Track list for students with limited time

✅ Interview-day DSA checklist

✅ Time & Space Complexity preparation guidance

COMPANIES COVERED

The preparation strategy covers:

• TCS

• Infosys

• Wipro

• Accenture

• Cognizant

• Capgemini

• HCLTech

• Tech Mahindra

🧠 TOPICS COVERED

Arrays

Two Sum, Kadane's Algorithm, Majority Element, Move Zeroes, Rotate Array, Product of Array Except Self and more.

Strings

Palindrome, Anagram, Longest Substring, String Compression, Roman to Integer and more.

Linked Lists

Reverse Linked List, Cycle Detection, Merge Lists, Intersection, Remove Nth Node and more.

Stack & Queue

Valid Parentheses, Next Greater Element, Min Stack, Queue Using Stacks and more.

Searching & Sorting

Binary Search, Rotated Sorted Array, Merge Sort, Count Inversions and more.

Hashing

HashMap / HashSet patterns, frequency counting, Group Anagrams, Subarray Sum and more.

Sliding Window & Two Pointers

Two Sum II, Container With Most Water, Longest Substring and more.

Recursion & Backtracking

Subsets, Permutations, Generate Parentheses, Rat in a Maze and more.

Trees & BST

Traversals, Level Order, Maximum Depth, Diameter, LCA, Validate BST and more.

Graphs

BFS, DFS, Number of Islands, Flood Fill, Number of Provinces and Cycle Detection.

Greedy

Activity Selection, Fractional Knapsack, Jump Game, Gas Station and more.

Dynamic Programming

Climbing Stairs, House Robber, Coin Change, 0/1 Knapsack, LCS, LIS, Edit Distance and more.

WHY THIS PDF?

The biggest problem students face isn't finding DSA questions.

It's knowing:

❌ What should I solve first?

❌ Which questions are important for my target company?

❌ Which topics should I prioritize?

❌ Where can I actually practice the question?

❌ How much DSA is enough for service-based interviews?

This resource organizes that preparation into one place.

40-PROBLEM FAST TRACK

Don't have time to solve everything?

The PDF includes a Fast Track list of high-value problems covering the major DSA patterns.

You can start with these before moving to the complete 120+ question list.

5-PHASE ROADMAP

The PDF also gives you a structured path:

Phase 1 → Arrays + Strings

Phase 2 → Linked List + Stack + Queue

Phase 3 → Searching + Sorting + Hashing + Sliding Window

Phase 4 → Recursion + Trees + Graphs

Phase 5 → Greedy + Dynamic Programming

HOW TO USE IT

Don't just read the questions.

For every problem:

1️⃣ Understand the problem

2️⃣ Try the brute-force approach

3️⃣ Optimize it

4️⃣ Code it yourself

5️⃣ Test edge cases

6️⃣ Write down Time & Space Complexity

7️⃣ Re-solve it later without looking at the solution

This turns the PDF into an actual DSA preparation system, not just another question list.

IMPORTANT!!!!

Company interviews can change based on hiring drive, role, location, experience and interviewer.

Therefore, company associations in this resource should be used as preparation guidance, not as a guarantee of the exact question you will receive.

The goal is to build strong DSA fundamentals and interview-ready problem-solving ability.

BEST FOR

• B.Tech / MCA students

• Freshers

• Placement preparation

• Service-based company preparation

• TCS / Infosys / Wipro / Accenture preparation

• Students starting DSA

• Students who don't know what DSA questions to practice

START YOUR DSA PREPARATION

Stop randomly solving questions.

Follow a structured path.

Learn → Practice → Revise → Interview

Build your DSA fundamentals and become placement-ready.

Instant digital access after purchase.