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Roblox DSA Interview Questions
56 curated coding interview questions directly asked in Roblox technical rounds, sorted by frequency with recency and difficulty diagnostics.
56
Total Questions
8 (14%)
Easy Problems
35 (62%)
Medium Problems
13 (23%)
Hard Problems
🔥 Most Tested Topics:
Core DSA (26)Arrays (14)Strings (6)Design (5)Trees (4)
📂 Sourced Datasets:
Last 3 monthsLast 6 monthsAll questionsOlder than 6 months
| ID | Problem | Difficulty | Topic | Pattern | Acceptance | Frequency | Recency |
|---|---|---|---|---|---|---|---|
| 359 | Logger Rate Limiter | Easy | Design | Data Structure Design | 76.8% | 100.0% | 3m |
| 723 | Candy Crush | Medium | Core DSA | Implementation / Reasoning | 77.4% | 100.0% | 6m |
| 1434 | Number of Ways to Wear Different Hats to Each Other | Hard | Core DSA | Implementation / Reasoning | 46.0% | 100.0% | 6m |
| 767 | Reorganize String | Medium | Strings | Hashing / Sliding Window | 57.1% | 100.0% | all |
| 621 | Task Scheduler | Medium | Greedy | Greedy | 63.1% | 87.5% | all |
| 210 | Course Schedule II | Medium | Graphs | BFS / DFS / Topological Sort | 55.5% | 87.5% | all |
| 68 | Text Justification | Hard | Core DSA | Implementation / Reasoning | 51.2% | 75.0% | 6m |
| 642 | Design Search Autocomplete System | Hard | Binary Search; Design | Binary Search; Data Structure Design | 50.0% | 75.0% | 6m |
| 362 | Design Hit Counter | Medium | Design | Data Structure Design | 69.7% | 75.0% | 6m |
| 1 | Two Sum | Easy | Arrays | Sorting / Prefix / Scan; Two Pointers | 57.5% | 75.0% | 6m |
| 849 | Maximize Distance to Closest Person | Medium | Core DSA | Implementation / Reasoning | 49.8% | 75.0% | 6m |
| 48 | Rotate Image | Medium | Arrays | Sorting / Prefix / Scan | 80.1% | 75.0% | all |
| 1552 | Magnetic Force Between Two Balls | Medium | Core DSA | Implementation / Reasoning | 72.1% | 75.0% | all |
| 811 | Subdomain Visit Count | Medium | Core DSA | Implementation / Reasoning | 77.2% | 75.0% | all |
| 1248 | Count Number of Nice Subarrays | Medium | Arrays | Sorting / Prefix / Scan | 75.1% | 75.0% | all |
| 1282 | Group the People Given the Group Size They Belong To | Medium | Core DSA | Implementation / Reasoning | 87.5% | 75.0% | all |
| 1290 | Convert Binary Number in a Linked List to Integer | Easy | Linked List | Two Pointers | 82.4% | 75.0% | all |
| 1280 | Students and Examinations | Easy | Core DSA | Implementation / Reasoning | 61.2% | 75.0% | all |
| 1297 | Maximum Number of Occurrences of a Substring | Medium | Arrays; Strings; Trees | Sorting / Prefix / Scan; Hashing / Sliding Window; DFS / BFS | 54.5% | 75.0% | all |
| 1364 | Number of Trusted Contacts of a Customer | Medium | Core DSA | Implementation / Reasoning | 74.7% | 75.0% | all |
| 273 | Integer to English Words | Hard | Strings | Hashing / Sliding Window | 35.0% | 75.0% | all |
| 20 | Valid Parentheses | Easy | Strings | Hashing / Sliding Window | 44.2% | 62.5% | all |
| 208 | Implement Trie (Prefix Tree) | Medium | Trees | DFS / BFS | 69.5% | 62.5% | all |
| 2817 | Minimum Absolute Difference Between Elements With Constraint | Medium | Arrays | Sorting / Prefix / Scan | 37.7% | 62.5% | all |
| 3043 | Find the Length of the Longest Common Prefix | Medium | Core DSA | Implementation / Reasoning | 62.2% | 62.5% | all |
| 2021 | Brightest Position on Street | Medium | Trees | DFS / BFS | 60.6% | 62.5% | all |
| 3161 | Block Placement Queries | Hard | Core DSA | Implementation / Reasoning | 18.7% | 62.5% | all |
| 992 | Subarrays with K Different Integers | Hard | Arrays | Sorting / Prefix / Scan | 68.1% | 62.5% | all |
| 2672 | Number of Adjacent Elements With the Same Color | Medium | Core DSA | Implementation / Reasoning | 59.6% | 62.5% | all |
| 1861 | Rotating the Box | Medium | Core DSA | Implementation / Reasoning | 82.5% | 62.5% | all |
| 207 | Course Schedule | Medium | Graphs | BFS / DFS / Topological Sort | 51.4% | 62.5% | all |
| 2768 | Number of Black Blocks | Medium | Core DSA | Implementation / Reasoning | 41.8% | 62.5% | all |
| 3071 | Minimum Operations to Write the Letter Y on a Grid | Medium | Arrays; Strings | Sorting / Prefix / Scan; Hashing / Sliding Window | 64.6% | 62.5% | all |
| 14 | Longest Common Prefix | Easy | Core DSA | Implementation / Reasoning | 47.6% | 50.0% | all |
| 1472 | Design Browser History | Medium | Design | Data Structure Design | 78.3% | 50.0% | all |
| 56 | Merge Intervals | Medium | Arrays | Sorting / Prefix / Scan | 51.8% | 50.0% | all |
| 2251 | Number of Flowers in Full Bloom | Hard | Core DSA | Implementation / Reasoning | 57.9% | 50.0% | all |
| 84 | Largest Rectangle in Histogram | Hard | Core DSA | Implementation / Reasoning | 49.9% | 50.0% | all |
| 54 | Spiral Matrix | Medium | Arrays | Sorting / Prefix / Scan | 56.8% | 50.0% | all |
| 42 | Trapping Rain Water | Hard | Core DSA | Two Pointers | 67.4% | 50.0% | all |
| 933 | Number of Recent Calls | Easy | Core DSA | Implementation / Reasoning | 78.5% | 50.0% | all |
| 2537 | Count the Number of Good Subarrays | Medium | Arrays | Sorting / Prefix / Scan | 65.8% | 50.0% | all |
| 3459 | Length of Longest V-Shaped Diagonal Segment | Hard | Core DSA | Implementation / Reasoning | 56.2% | 50.0% | all |
| 1419 | Minimum Number of Frogs Croaking | Medium | Arrays | Sorting / Prefix / Scan | 51.1% | 37.5% | all |
| 759 | Employee Free Time | Hard | Core DSA | Implementation / Reasoning | 72.9% | 37.5% | all |
| 994 | Rotting Oranges | Medium | Core DSA | Implementation / Reasoning | 58.7% | 37.5% | all |
| 3 | Longest Substring Without Repeating Characters | Medium | Strings; Trees | Hashing / Sliding Window; DFS / BFS; Sliding Window | 39.1% | 37.5% | all |
| 661 | Image Smoother | Easy | Core DSA | Implementation / Reasoning | 69.3% | 37.5% | all |
| 128 | Longest Consecutive Sequence | Medium | Core DSA | Implementation / Reasoning | 47.1% | 37.5% | all |
| 770 | Basic Calculator IV | Hard | Stack / Queue | Monotonic Stack / Simulation | 49.8% | 37.5% | all |
| 1743 | Restore the Array From Adjacent Pairs | Medium | Arrays | Sorting / Prefix / Scan | 75.0% | 37.5% | all |
| 1814 | Count Nice Pairs in an Array | Medium | Arrays | Sorting / Prefix / Scan | 48.4% | 37.5% | all |
| 380 | Insert Delete GetRandom O(1) | Medium | Core DSA | Implementation / Reasoning | 55.4% | 37.5% | all |
| 528 | Random Pick with Weight | Medium | Core DSA | Implementation / Reasoning | 49.1% | 37.5% | all |
| 2502 | Design Memory Allocator | Medium | Design | Data Structure Design | 50.1% | 37.5% | all |
| 239 | Sliding Window Maximum | Hard | Arrays | Sorting / Prefix / Scan; Sliding Window | 48.8% | 37.5% | all |