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Mastercard DSA Interview Questions

Crack your Mastercard SDE interview in 2026 with this handpicked DSA sheet — the fastest way to prepare for Mastercard coding rounds without wasting hours scrolling random blogs. Mastercard's fintech-grade payment systems demand rock-solid fundamentals in arrays, strings, hashing, and object-oriented design, alongside the ability to reason about transaction-scale data under tight time and space constraints. This sheet compiles 61 of the most frequently asked Mastercard interview questions on LeetCode and GeeksforGeeks, covering high-frequency patterns like sliding window, two pointers, dynamic programming, tree/graph traversal, and system-style design problems. Each question is tagged by topic, difficulty, and real candidate-reported frequency, so you spend your prep time on what actually gets asked — not everything under the sun. Bookmark this Mastercard coding interview questions sheet and start solving smarter today.

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1. Two Sum
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2. Maximum Subarray
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3. Best Time to Buy and Sell Stock
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4. Best Time to Buy and Sell Stock II
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5. Valid Parentheses
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6. Longest Substring Without Repeating Characters
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7. Longest Palindromic Substring
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8. Merge Intervals
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9. Insert Interval
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10. Group Anagrams
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11. Product of Array Except Self
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12. Subarray Sum Equals K
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13. 3Sum
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14. Container With Most Water
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15. Trapping Rain Water
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16. Kth Largest Element in an Array
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17. Top K Frequent Elements
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18. Search in Rotated Sorted Array
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19. Find Minimum in Rotated Sorted Array
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20. Rotate Array
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21. Spiral Matrix
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22. Rotate Image
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23. Set Matrix Zeroes
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24. Reverse Linked List
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25. Merge Two Sorted Lists
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26. Linked List Cycle
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27. Add Two Numbers
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28. Copy List with Random Pointer
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29. LRU Cache
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30. Binary Tree Inorder Traversal
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31. Binary Tree Level Order Traversal
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32. Validate Binary Search Tree
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33. Lowest Common Ancestor of a Binary Tree
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34. Diameter of Binary Tree
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35. Maximum Depth of Binary Tree
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36. Number of Islands
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37. Course Schedule
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38. Clone Graph
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39. Word Break
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40. Coin Change
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41. House Robber
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42. Climbing Stairs
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43. Unique Paths
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44. Longest Increasing Subsequence
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45. Partition Equal Subset Sum
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46. Decode Ways
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47. Word Search
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48. Subsets
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49. Permutations
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50. Combination Sum
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51. Implement Queue using Stacks
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52. Min Stack
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53. Evaluate Reverse Polish Notation
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54. Design a Data Structure for LRU Cache
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55. Detect Cycle in a Directed Graph
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56. Find the Longest Common Subsequence
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57. Find the Kth Smallest Element in an Unsorted Array
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58. Boundary Traversal of a Binary Tree
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59. Rat in a Maze Problem
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60. Find Median of Two Sorted Arrays of Different Sizes
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61. Design an ATM Machine
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