TOP 100 TCS NQT CODING QUESTIONS

The TCS National Qualifier Test (NQT) is one of the most important assessments for anyone aspiring to work at Tata Consultancy Services. To succeed, you need to be well-prepared, especially when it comes to coding challenges. Whether you are a beginner or an experienced coder, practicing coding problems is a great way to sharpen your skills and get exam-ready.

Below, we’ve compiled a comprehensive list of coding problems categorized by topics, which will help you cover a wide range of concepts and techniques essential for cracking the TCS NQT.

TOP 100 TCS NQT CODING QUESTIONS

Problems on Arrays
Arrays are one of the most important data structures, and mastering array problems will help you tackle a variety of challenges. Here are some key problems to practice:

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 unsorted array
13. Adding 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 array
17. Maximum product subarray in an array
18. Replace each element of the array by its rank in the array
19. Sorting elements of an array by frequency
20. Rotation of elements of array- left and right
21. Finding equilibrium index of an array
22. Finding Circular rotation of an array by K positions
23. Sort an array according to the order defined by another array
24. Search an element in an array
25. Check if Array is a subset of another array or notProblems on Numbers

    
    Number-based problems are fundamental in competitive programming. These will help you improve your mathematical reasoning and logic:

26. Check if a number is palindrome or not
27. Find all Palindrome numbers in a given range
28. Check if a number is prime or not
29. Prime numbers in a given range
30. Check if a number is armstrong number of not
31. Check if a number is perfect number
32. Even or Odd
33. Check weather a given number is positive or negative
34. Sum of first N natural numbers
35. Find Sum of AP Series
36. Program to find sum of GP Series
37. Greatest of two numbers
38. Greatest of three numbers
39. Leap Year or not
40. Reverse digits of a number
41. Maximum and Minimum digit in a number
42. Print Fibonacci upto Nth Term
43. Factorial of a number
44. Power of a number
45. Factors of a given number
46. Print all prime factors of the given number
47. Check if a number is a strong number or not
48. Check if a Number is Automorphic
49. GCD of two numbers
50. LCM of two numbers
51. Check if a number is Harshad number
52. Check if the number is abundant number or not
53. Sum of digits of a number
54. Sum of numbers in the given range
55. Permutations in which N people can occupy R seats in a classroom
56. Program to add two fractions
57. Replace all 0s with 1s in a given integer
58. Can a number be expressed as a sum of two prime numbers
59. Calculate the area of circle
60. Program to find roots of a Quadratic EquationProblems on Number System

    
    These problems will test your understanding of number systems, a crucial concept for many coding interviews and exams:

61. Convert Binary to Decimal
62. Convert binary to octal
63. Decimal to Binary conversion
64. Convert decimal to octal
65. Convert octal to binary
66. Convert octal to decimal
67. Convert digits/numbers to wordsProblems on Sorting

    
    Sorting algorithms are essential, and understanding the different techniques will give you an edge in problem-solving:

68. Bubble Sort Algorithm
69. Selection Sort Algorithm
70. Insertion Sort Algorithm
71. Quick Sort Algorithm
72. Merge sort algorithm

    
    Problems on Strings
    String manipulation is an important skill, and there are many practical problems that require efficient string handling:

73. Check if a given string is palindrome or not
74. Count number of vowels, consonants, spaces in String
75. Find the ASCII value of a character
76. Remove all vowels from the string
77. Remove spaces from a string
78. Remove characters from a string except alphabets
79. Reverse a String
80. Remove brackets from an algebraic expression
81. Sum of the numbers in a String
82. Capitalize first and last character of each word
83. Calculate frequency of characters in a string
84. Find Non-repeating characters of a String
85. Check if two strings are anagram of each other
86. Count common sub-sequence in two strings
87. Check if two strings match where one string contains wildcard characters
88. Return maximum occurring character in the input string
89. Remove all duplicates from the input string.
90. Print all the duplicates in the input string.
91. Remove characters from first string present in the second string
92. Change every letter with the next lexicographic alphabet in the given string
93. Write a program to find the largest word in a given string.
94. Write a program to sort characters in a string
95. Count number of words in a given string
96. Write a program to find a word in a given string which has the highest number of repeated letters
97. Change case of each character in a string
98. Concatenate one string to another
99. Write a program to find a substring within a string. If found display its starting position
100. Reverse words in a string

Conclusion:
The key to excelling in the TCS NQT or any coding interview is consistent practice and problem-solving. By working through a diverse set of coding challenges across arrays, numbers, strings, and sorting, you’ll develop a strong grasp of the fundamental concepts and algorithms. Make sure to dedicate time regularly to practice, and remember, each problem you solve brings you one step closer to mastering coding and securing your future career at TCS. Keep coding, stay motivated, and good luck with your preparation!

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