If you’re preparing for TCS NQT (National Qualifier Test), this blog will be your complete coding roadmap.

This post contains 100 most frequently asked TCS NQT coding questions, categorized topic-wise. I will be adding detailed solutions for each problem in this blog (or linking them individually).

💡 Tip: It is believed that TCS gives additional weightage to candidates who solve more coding questions during campus hiring. While there is no official confirmation, strong coding performance definitely improves your chances.

📌 About TCS NQT

TCS NQT (National Qualifier Test) is conducted by Tata Consultancy Services (TCS) to hire candidates for roles like:

• TCS Ninja
• TCS Digital

Every year, more than 10 lakh+ candidates appear for this exam.

The Coding section plays a crucial role in final selection.

📚 TCS NQT Coding Questions (Topic Wise)

🔢 1. Problems on Arrays

Below are the most important array-based coding questions asked in TCS NQT:

1. Find the smallest number in an array
2. Find the largest number in an array
3. Second smallest and second largest element in an array
4. Reverse a given array
5. Count frequency of each element in an array
6. Rearrange array in increasing-decreasing order
7. Calculate sum of the elements of the array
8. Rotate array by K elements (Block Swap Algorithm)
9. Average of all elements in an array
10. Find the median of the given array
11. Remove duplicates from a sorted array
12. Remove duplicates from an unsorted array
13. Add element in an array
14. Find all repeating elements in an array
15. Find all non-repeating elements in an array
16. Find all symmetric pairs in an array
17. Maximum product subarray in an array
18. Replace each element by its rank
19. Sort elements by frequency
20. Left and Right rotation of array
21. Find equilibrium index of an array
22. Circular rotation of array by K positions
23. Sort array according to order defined by another array
24. Search an element in an array
25. Check if array is subset of another array

👉 (Add your solutions below each question or link them individually)

🔢 2. Problems on Numbers

These number-based questions are extremely common in TCS coding tests:

1. Check if a number is palindrome
2. Find all palindrome numbers in a range
3. Check if a number is prime
4. Prime numbers in a given range
5. Check if a number is Armstrong
6. Check if a number is Perfect number
7. Even or Odd
8. Positive or Negative number
9. Sum of first N natural numbers
10. Sum of AP Series
11. Sum of GP Series
12. Greatest of two numbers
13. Greatest of three numbers
14. Leap Year or not
15. Reverse digits of a number
16. Maximum and minimum digit in a number
17. Fibonacci series up to N terms
18. Factorial of a number
19. Power of a number
20. Factors of a given number
21. Print all prime factors
22. Check if number is Strong number
23. Check if number is Automorphic
24. GCD of two numbers
25. LCM of two numbers
26. Harshad number
27. Abundant number
28. Sum of digits
29. Sum of numbers in a range
30. Permutations (N people occupying R seats)
31. Add two fractions
32. Replace all 0s with 1s in an integer
33. Express number as sum of two primes
34. Area of circle
35. Roots of quadratic equation

👉 (Add detailed explanations and code solutions below each question)

🔢 3. Problems on Number System

Important conversion-based questions:

1. Binary to Decimal
2. Binary to Octal
3. Decimal to Binary
4. Decimal to Octal
5. Octal to Binary
6. Octal to Decimal
7. Convert digits/numbers to words

🔄 4. Problems on Sorting

Sorting algorithms are fundamental and frequently asked:

1. Bubble Sort
2. Selection Sort
3. Insertion Sort
4. Quick Sort
5. Merge Sort

👉 Include:

• Algorithm explanation
• Time complexity
• Code implementation

🔤 5. Problems on Strings

String problems are very common in TCS NQT:

1. Check if string is palindrome
2. Count vowels, consonants, spaces
3. ASCII value of a character
4. Remove vowels from string
5. Remove spaces from string
6. Remove characters except alphabets
7. Reverse a string
8. Remove brackets from algebraic expression
9. Sum of numbers in a string
10. Capitalize first and last character of each word
11. Frequency of characters
12. Find non-repeating characters
13. Check if two strings are anagrams
14. Count common subsequences
15. Wildcard string matching
16. Maximum occurring character
17. Remove duplicates from string
18. Print duplicate characters
19. Remove characters of second string from first
20. Replace each letter with next lexicographic alphabet
21. Largest word in string
22. Sort characters in string
23. Count number of words
24. Word with highest repeated letters
25. Change case of characters
26. Concatenate strings
27. Find substring and display position
28. Reverse words in string

👉 Add:

• Approach explanation
• Optimized solution
• Time & space complexity

🎯 How to Use This Coding Sheet Effectively

✔ Solve questions topic-wise
✔ Practice without looking at solutions first
✔ Time yourself
✔ Revise important logic patterns
✔ Focus on edge cases

💡 Final Tips to Crack TCS NQT Coding Section

• Practice basic data structures thoroughly
• Master arrays and strings
• Be strong in number theory basics
• Understand sorting and recursion
• Improve speed and accuracy
• Practice previous year questions

📢 Coming Soon

I will be adding:

• ✅ Detailed solutions for each question
• ✅ Optimized code in C++ / Java / Python
• ✅ Time & Space Complexity analysis
• ✅ Practice test sets

Stay tuned and bookmark this page! 🚀