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Zenefits DSA Interview Questions
21 curated coding interview questions directly asked in Zenefits technical rounds, sorted by frequency with recency and difficulty diagnostics.
21
Total Questions
5 (24%)
Easy Problems
11 (52%)
Medium Problems
5 (24%)
Hard Problems
🔥 Most Tested Topics:
Core DSA (6)Strings (4)Graphs (4)Arrays (3)Trees (3)
📂 Sourced Datasets:
All questionsOlder than 6 months
| ID | Problem | Difficulty | Topic | Pattern | Acceptance | Frequency | Recency |
|---|---|---|---|---|---|---|---|
| 4 | Median of Two Sorted Arrays | Hard | Arrays; Heap | Sorting / Prefix / Scan; Priority Queue | 46.6% | 100.0% | all |
| 20 | Valid Parentheses | Easy | Strings | Hashing / Sliding Window | 44.2% | 100.0% | all |
| 22 | Generate Parentheses | Medium | Strings | Hashing / Sliding Window | 78.7% | 100.0% | all |
| 42 | Trapping Rain Water | Hard | Core DSA | Two Pointers | 67.4% | 100.0% | all |
| 52 | N-Queens II | Hard | Backtracking | Backtracking | 78.7% | 100.0% | all |
| 109 | Convert Sorted List to Binary Search Tree | Medium | Arrays; Trees; Linked List; Binary Search | Sorting / Prefix / Scan; DFS / BFS; Two Pointers; Binary Search | 66.6% | 100.0% | all |
| 125 | Valid Palindrome | Easy | Strings | Hashing / Sliding Window | 53.3% | 100.0% | all |
| 146 | LRU Cache | Medium | Design | Data Structure Design | 47.4% | 100.0% | all |
| 155 | Min Stack | Medium | Stack / Queue | Monotonic Stack / Simulation | 58.2% | 100.0% | all |
| 168 | Excel Sheet Column Title | Easy | Core DSA | Implementation / Reasoning | 46.5% | 100.0% | all |
| 169 | Majority Element | Easy | Core DSA | Implementation / Reasoning | 66.3% | 100.0% | all |
| 200 | Number of Islands | Medium | Graphs | BFS / DFS / Topological Sort | 64.4% | 100.0% | all |
| 206 | Reverse Linked List | Easy | Linked List | Two Pointers | 80.6% | 100.0% | all |
| 207 | Course Schedule | Medium | Graphs | BFS / DFS / Topological Sort | 51.4% | 100.0% | all |
| 210 | Course Schedule II | Medium | Graphs | BFS / DFS / Topological Sort | 55.5% | 100.0% | all |
| 229 | Majority Element II | Medium | Core DSA | Implementation / Reasoning | 56.2% | 100.0% | all |
| 239 | Sliding Window Maximum | Hard | Arrays | Sorting / Prefix / Scan; Sliding Window | 48.8% | 100.0% | all |
| 251 | Flatten 2D Vector | Medium | Core DSA | Implementation / Reasoning | 50.5% | 100.0% | all |
| 255 | Verify Preorder Sequence in Binary Search Tree | Medium | Trees; Binary Search | DFS / BFS; Binary Search | 51.8% | 100.0% | all |
| 261 | Graph Valid Tree | Medium | Strings; Trees; Graphs | Hashing / Sliding Window; DFS / BFS; BFS / DFS / Topological Sort | 50.0% | 100.0% | all |
| 317 | Shortest Distance from All Buildings | Hard | Core DSA | Implementation / Reasoning | 44.9% | 100.0% | all |