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Cognizant DSA Interview Questions

Crack the Cognizant technical assessment with this definitive, high-yield DSA preparation sheet featuring 74 highly recurring coding questions aggregated from recent GenC, GenC Elevate, and GenC Next mass hiring loops. Cognizant's technical evaluation framework heavily targets proficiency in foundational data handling, logical loops, element filtering, and multi-pointer search arrays. Use this verified production-ready dataset—complete with direct LeetCode and GeeksforGeeks links alongside real student frequency indexes—to significantly scale traffic, organic search indexing, and candidate utility on your tracking platform.

74 Problems
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1. Valid Palindrome
LeetCode•
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Very Hot
2. Reverse String
LeetCode•
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Hot
3. Climbing Stairs
LeetCode•
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Very Hot
4. Merge Sorted Array
LeetCode•
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Hot
5. Find First and Last Position of Element in Sorted Array
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Very Hot
6. Fibonacci Number
LeetCode•
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Hot
7. Fizz Buzz
LeetCode•
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Warm
8. Maximum Subarray
LeetCode•
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Very Hot
9. Linked List Cycle
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Hot
10. Two Sum
LeetCode•
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Very Hot
11. Valid Parentheses
LeetCode•
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Very Hot
12. Majority Element
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Hot
13. Move Zeroes
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Hot
14. First Unique Character in a String
LeetCode•
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Hot
15. Best Time to Buy and Sell Stock
LeetCode•
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Very Hot
16. Valid Anagram
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Hot
17. Longest Common Prefix
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Hot
18. Missing Number
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Hot
19. Single Number
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Very Hot
20. Intersection of Two Arrays II
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Warm
21. Reverse Linked List
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Very Hot
22. Merge Two Sorted Lists
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Hot
23. Middle of the Linked List
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Hot
24. Remove Duplicates from Sorted List
LeetCode•
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Warm
25. Pascal's Triangle
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Hot
26. Search Insert Position
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Hot
27. Contains Duplicate
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Very Hot
28. Length of Last Word
LeetCode•
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Warm
29. Count and Say
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Warm
30. Binary Search
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Very Hot
31. Find the Index of the First Occurrence in a String
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Hot
32. Plus One
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Warm
33. Power of Three
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Warm
34. Squares of a Sorted Array
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Hot
35. Search a 2D Matrix
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Very Hot
36. Container With Most Water
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Hot
37. Reverse Words in a String
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Hot
38. Product of Array Except Self
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Hot
39. Subarray Sum Equals K
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Hot
40. Group Anagrams
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Warm
41. Longest Substring Without Repeating Characters
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Very Hot
42. Number of Islands
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Very Hot
43. Rotting Oranges
LeetCode•
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Very Hot
44. Spiral Matrix
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Hot
45. Remove Nth Node From End of List
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Hot
46. Add Two Numbers
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Very Hot
47. Palindrome Linked List
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Hot
48. Sort Colors
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Hot
49. Kth Largest Element in an Array
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Hot
50. Top K Frequent Elements
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Hot
51. Coin Change
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Very Hot
52. House Robber
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Hot
53. Longest Consecutive Sequence
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Hot
54. Word Break
LeetCode•
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Warm
55. Permutations
LeetCode•
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Warm
56. Subsets
LeetCode•
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Warm
57. 3Sum
LeetCode•
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Hot
58. Min Stack
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Hot
59. Evaluate Reverse Polish Notation
LeetCode•
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Warm
60. Network Delay Time
LeetCode•
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Warm
61. Merge Intervals
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Hot
62. Meeting Rooms
GeeksforGeeks•
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Hot
63. Check if a Binary Tree is BST
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Hot
64. Lowest Common Ancestor of a Binary Tree
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Hot
65. Maximum Depth of Binary Tree
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Hot
66. Inorder Traversal of Binary Tree
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Warm
67. Symmetric Tree
LeetCode•
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Warm
68. Gas Station
LeetCode•
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Warm
69. Next Permutation
LeetCode•
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Warm
70. Find the Duplicate Number
LeetCode•
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Hot
71. Search in Rotated Sorted Array
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Very Hot
72. Is Subsequence
LeetCode•
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Hot
73. Find Peak Element
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Hot
74. Shortest Path in a Binary Maze
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Hot