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HCLTech DSA Interview Questions

Crack the HCLTech technical selection engine with this definitive, high-yield DSA preparation sheet containing 74 highly recurring coding questions aggregated from recent Graduate Engineer Trainee (GET), Software Engineer (SE), and campus mass hiring drives. HCLTech's screening framework strictly tests rapid code implementation, logic loops, basic numerical math conversions, and structural string operations under tight timelines. Use this fully shuffled, production-grade dataset—loaded with direct LeetCode and GeeksforGeeks links alongside live popularity tags—to dramatically scale user engagement, crawl metrics, and structural candidate traction on your site.

74 Problems
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Overall Progress

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1. Move Hash to Front
GeeksforGeeks•
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Very Hot
2. Valid Palindrome
LeetCode•
•
Very Hot
3. Climbing Stairs
LeetCode•
•
Very Hot
4. Fibonacci Number
LeetCode•
•
Hot
5. Maximum Subarray
LeetCode•
•
Very Hot
6. Two Sum
LeetCode•
•
Very Hot
7. Valid Parentheses
LeetCode•
•
Very Hot
8. Majority Element
LeetCode•
•
Hot
9. Best Time to Buy and Sell Stock
LeetCode•
•
Very Hot
10. Valid Anagram
LeetCode•
•
Hot
11. Longest Common Prefix
LeetCode•
•
Hot
12. Missing Number
LeetCode•
•
Hot
13. Single Number
LeetCode•
•
Very Hot
14. Reverse Linked List
LeetCode•
•
Very Hot
15. Merge Two Sorted Lists
LeetCode•
•
Hot
16. Pascal's Triangle
LeetCode•
•
Hot
17. Search Insert Position
LeetCode•
•
Hot
18. Contains Duplicate
LeetCode•
•
Very Hot
19. Binary Search
LeetCode•
•
Very Hot
20. Find the Index of the First Occurrence in a String
LeetCode•
•
Hot
21. Search a 2D Matrix
LeetCode•
•
Very Hot
22. Container With Most Water
LeetCode•
•
Hot
23. Product of Array Except Self
LeetCode•
•
Hot
24. Subarray Sum Equals K
LeetCode•
•
Hot
25. Group Anagrams
LeetCode•
•
Warm
26. Longest Substring Without Repeating Characters
LeetCode•
•
Very Hot
27. Number of Islands
LeetCode•
•
Very Hot
28. Rotting Oranges
LeetCode•
•
Very Hot
29. Spiral Matrix
LeetCode•
•
Hot
30. Sort Colors
LeetCode•
•
Hot
31. Coin Change
LeetCode•
•
Very Hot
32. House Robber
LeetCode•
•
Hot
33. Longest Consecutive Sequence
LeetCode•
•
Hot
34. Word Break
LeetCode•
•
Warm
35. Permutations
LeetCode•
•
Warm
36. Subsets
LeetCode•
•
Warm
37. 3Sum
LeetCode•
•
Hot
38. Min Stack
LeetCode•
•
Hot
39. Merge Intervals
LeetCode•
•
Hot
40. Meeting Rooms
GeeksforGeeks•
•
Hot
41. Check if a Binary Tree is BST
LeetCode•
•
Hot
42. Lowest Common Ancestor of a Binary Tree
LeetCode•
•
Hot
43. Maximum Depth of Binary Tree
LeetCode•
•
Hot
44. Inorder Traversal of Binary Tree
LeetCode•
•
Warm
45. Symmetric Tree
LeetCode•
•
Warm
46. Gas Station
LeetCode•
•
Warm
47. Next Permutation
LeetCode•
•
Warm
48. Find the Duplicate Number
LeetCode•
•
Hot
49. Search in Rotated Sorted Array
LeetCode•
•
Very Hot
50. Is Subsequence
LeetCode•
•
Hot
51. Find Peak Element
LeetCode•
•
Hot
52. Shortest Path in a Binary Maze
GeeksforGeeks•
•
Hot
53. Count Primes
LeetCode•
•
Very Hot
54. Maximum Product Subarray
LeetCode•
•
Hot
55. Longest Palindromic Substring
LeetCode•
•
Very Hot
56. Valid Sudoku
LeetCode•
•
Hot
57. Jump Game
LeetCode•
•
Very Hot
58. Kth Smallest Element in a BST
LeetCode•
•
Hot
59. Unique Paths
LeetCode•
•
Hot
60. Set Matrix Zeroes
LeetCode•
•
Hot
61. Word Search
LeetCode•
•
Warm
62. Rotate Image
LeetCode•
•
Hot
63. Remove Duplicates from Sorted Array
LeetCode•
•
Very Hot
64. Implement Queue using Stacks
LeetCode•
•
Warm
65. Flatten Binary Tree to Linked List
LeetCode•
•
Warm
66. Binary Tree Zigzag Level Order Traversal
LeetCode•
•
Hot
67. Longest Palindromic Subsequence
LeetCode•
•
Warm
68. Edit Distance
LeetCode•
•
Hot
69. Network Delay Time
LeetCode•
•
Warm
70. Generate Parentheses
LeetCode•
•
Hot
71. Minimum Path Sum
LeetCode•
•
Hot
72. Smallest Substring with All Distinct Characters
LeetCode•
•
Very Hot
73. Fizz Buzz Level 2 (Custom Repetitions)
LeetCode•
•
Hot