| S.No |
Interview Question |
Number of times candidates experienced this question in interviews |
| 1 | Smallest Positive Number Missing in an Unsorted Array | 2267 |
| 2 | First non Repeating Element | 2134 |
| 3 | Find the Number Occurring Odd Number of Times in an Array | 1950 |
| 4 | Generate all Binary Strings Without Consecutive 1’s | 1842 |
| 5 | Second Most Repeated Word in a Sequence | 1798 |
| 6 | Program for Bridge and Torch problem | 1486 |
| 7 | Implement Two Stacks in an Array | 1366 |
| 8 | Reverse a linked list | 1338 |
| 9 | Count of index pairs with equal elements in an array | 1328 |
| 10 | Find elements which are present in first array and not in second | 1275 |
| 11 | Find Index of Closing Bracket for a Given Opening Bracket in an Expression | 1219 |
| 12 | Iterative Method to find Height of Binary Tree | 1187 |
| 13 | Design a stack that supports getMin() in O(1) time and O(1) extra space | 1151 |
| 14 | Sort 0s 1s and 2s in an Array | 1139 |
| 15 | Check if a given array contains duplicate elements within k distance from each other | 1092 |
| 16 | Queries for counts of array elements with values in given range | 1077 |
| 17 | Find distinct elements common to all rows of a matrix | 1035 |
| 18 | Check for Balanced Parentheses in an Expression | 1000 |
| 19 | Balanced Expression with Replacement | 964 |
| 20 | Largest Sum Contiguous Subarray | 963 |
| 21 | Find Nth Node | 925 |
| 22 | First missing positive | 914 |
| 23 | Check if Two Expressions With Brackets are Same | 902 |
| 24 | The Knapsack Problem | 900 |
| 25 | Non-overlapping sum of two sets | 883 |
| 26 | How to check if two given sets are disjoint? | 870 |
| 27 | Tree Traversal (Preorder, Inorder & Postorder) | 810 |
| 28 | Next Greater Element in an Array | 779 |
| 29 | Products of ranges in an array | 775 |
| 30 | Given a binary tree, how do you remove all the half nodes? | 767 |
