11 curated coding interview questions directly asked in Mastercard technical rounds, sorted by frequency with recency and difficulty diagnostics.
| ID | Problem | Difficulty | Topic | Pattern | Acceptance | Frequency | Recency |
|---|---|---|---|---|---|---|---|
| 121 | Best Time to Buy and Sell Stock | Easy | Core DSA | Implementation / Reasoning | 56.8% | 100.0% | 3m |
| 412 | Fizz Buzz | Easy | Core DSA | Implementation / Reasoning | 75.5% | 100.0% | 6m |
| 1 | Two Sum | Easy | Arrays | Sorting / Prefix / Scan; Two Pointers | 57.5% | 100.0% | all |
| 20 | Valid Parentheses | Easy | Strings | Hashing / Sliding Window | 44.2% | 87.5% | all |
| 322 | Coin Change | Medium | Dynamic Programming | State Transition | 48.4% | 87.5% | all |
| 242 | Valid Anagram | Easy | Strings | Hashing / Sliding Window | 68.1% | 75.0% | all |
| 11 | Container With Most Water | Medium | Core DSA | Two Pointers | 60.0% | 75.0% | all |
| 5 | Longest Palindromic Substring | Medium | Strings; Trees | Hashing / Sliding Window; DFS / BFS | 37.8% | 75.0% | all |
| 134 | Gas Station | Medium | Greedy | Greedy | 48.0% | 75.0% | all |
| 79 | Word Search | Medium | Strings; Binary Search | Hashing / Sliding Window; Binary Search | 47.4% | 75.0% | all |
| 518 | Coin Change II | Medium | Dynamic Programming | State Transition | 60.0% | 75.0% | all |