Infosys SP & DSE – Previous Year Coding Questions with Solutions + How to Crack the Online Assessment
If you’re preparing for Infosys Specialist Programmer (SP) or Digital Specialist Engineer (DSE) roles, the coding round is the most crucial step. These roles demand stronger programming knowledge and problem-solving skills compared to the generic Infosys NQT. This guide breaks down real previous year Infosys SP & DSE coding questions with beginner-friendly explanations, code solutions, and tips on how to crack the online assessment.
How to Crack Infosys SP & DSE Online Assessment
The Infosys SP/DSE online test includes advanced-level programming questions, usually from data structures, algorithms, and problem-solving domains. Here’s how to approach it smartly:
1. Understand the Test Structure
- Total Questions: 3 coding problems
- Time Limit: 3 hours
- Difficulty: Medium to Hard (DSA level)
- Languages Allowed: C, C++, Java, Python
- Questions are usually based on:
- Arrays and Strings
- Hashing and Sorting
- Recursion, Backtracking
- Stack, Queue, Linked List
- Tree/Graph Basics
Infosys SP,DSE Exam pattern & Cut-Off – Click here
2. Brush Up These Topics
- String manipulation (palindrome, anagram, substrings)
- Two-pointer and sliding window techniques
- Sorting and searching algorithms (binary search)
- Recursion and dynamic programming (for SP roles)
- Hash maps and sets (counting, lookups)
- Prefix sum, subarray problems
3. Practice Pattern-Based Questions
Pattern questions are regularly asked to check logical flow. Practice printing patterns using loops and conditionals.
4. Write Clean & Efficient Code
- Start with a brute-force solution to show clarity
- Optimize using better logic if time permits
- Add comments where needed
- Use meaningful variable names
5. Dry Run Your Code
Test your solution with:
- Edge cases (empty strings, single element arrays)
- Maximum input size
- Incorrect or malformed input
6. Use Online IDEs & Timed Practice
- Use platforms like LeetCode, GeeksforGeeks, CodeStudio, HackerRank
- Set a timer for 1-hour coding practice daily
- Solve 2 Medium + 1 Hard problem every day
7. Revise Past Infosys Questions
Refer to previous questions asked in:
- HackWithInfy
- Infosys Certification Challenge
- Off-campus SP/DSE drives
Sample Infosys Coding Questions
- Print Diamond Pattern
- Max Difference in Array (Larger After Smaller)
- Check Anagram
- Leaders in Array
- First Non-Repeating Character
- Longest Unique Substring (Sliding Window)
- Merge Intervals (Sorting)
- Detect Cycle in Linked List (Floyd’s Algorithm)
These are representative of what you may face in the exam. Check the solutions above for step-by-step code.
Final Advice
- Consistency is the key – practice daily
- Choose one preferred language and master it
- Focus more on logic than syntax
- Attempt mock assessments before the actual test
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