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Deloitte DSA Interview Questions
41 curated coding interview questions directly asked in Deloitte technical rounds, sorted by frequency with recency and difficulty diagnostics.
41
Total Questions
16 (39%)
Easy Problems
22 (54%)
Medium Problems
3 (7%)
Hard Problems
🔥 Most Tested Topics:
Core DSA (14)Arrays (13)Strings (11)Dynamic Programming (3)Trees (3)
📂 Sourced Datasets:
Last 3 monthsLast 6 monthsAll questionsOlder than 6 months
| ID | Problem | Difficulty | Topic | Pattern | Acceptance | Frequency | Recency |
|---|---|---|---|---|---|---|---|
| 1 | Two Sum | Easy | Arrays | Sorting / Prefix / Scan; Two Pointers | 57.5% | 100.0% | 3m |
| 23 | Merge k Sorted Lists | Hard | Arrays; Linked List; Heap | Sorting / Prefix / Scan; Two Pointers; Priority Queue | 59.6% | 100.0% | all |
| 402 | Remove K Digits | Medium | Core DSA | Implementation / Reasoning | 36.9% | 87.5% | 3m |
| 70 | Climbing Stairs | Easy | Dynamic Programming | State Transition | 54.1% | 87.5% | 3m |
| 2388 | Change Null Values in a Table to the Previous Value | Medium | Core DSA | Implementation / Reasoning | 51.5% | 87.5% | all |
| 14 | Longest Common Prefix | Easy | Core DSA | Implementation / Reasoning | 47.6% | 75.0% | 6m |
| 67 | Add Binary | Easy | Core DSA | Implementation / Reasoning | 58.1% | 75.0% | 6m |
| 3 | Longest Substring Without Repeating Characters | Medium | Strings; Trees | Hashing / Sliding Window; DFS / BFS; Sliding Window | 39.1% | 75.0% | 6m |
| 20 | Valid Parentheses | Easy | Strings | Hashing / Sliding Window | 44.2% | 75.0% | 6m |
| 121 | Best Time to Buy and Sell Stock | Easy | Core DSA | Implementation / Reasoning | 56.8% | 75.0% | all |
| 5 | Longest Palindromic Substring | Medium | Strings; Trees | Hashing / Sliding Window; DFS / BFS | 37.8% | 75.0% | all |
| 176 | Second Highest Salary | Medium | Core DSA | Implementation / Reasoning | 47.0% | 75.0% | all |
| 9 | Palindrome Number | Easy | Strings | Hashing / Sliding Window | 60.6% | 62.5% | all |
| 570 | Managers with at Least 5 Direct Reports | Medium | Core DSA | Implementation / Reasoning | 49.0% | 62.5% | all |
| 11 | Container With Most Water | Medium | Core DSA | Two Pointers | 60.0% | 62.5% | all |
| 56 | Merge Intervals | Medium | Arrays | Sorting / Prefix / Scan | 51.8% | 62.5% | all |
| 53 | Maximum Subarray | Medium | Arrays | Sorting / Prefix / Scan | 53.3% | 62.5% | all |
| 387 | First Unique Character in a String | Easy | Strings | Hashing / Sliding Window | 65.5% | 62.5% | all |
| 15 | 3Sum | Medium | Arrays | Sorting / Prefix / Scan | 39.1% | 62.5% | all |
| 26 | Remove Duplicates from Sorted Array | Easy | Arrays | Sorting / Prefix / Scan; Two Pointers | 62.8% | 62.5% | all |
| 72 | Edit Distance | Medium | Dynamic Programming | State Transition | 60.6% | 50.0% | all |
| 2594 | Minimum Time to Repair Cars | Medium | Arrays | Sorting / Prefix / Scan | 59.5% | 50.0% | all |
| 322 | Coin Change | Medium | Dynamic Programming | State Transition | 48.4% | 50.0% | all |
| 197 | Rising Temperature | Easy | Core DSA | Implementation / Reasoning | 51.3% | 50.0% | all |
| 485 | Max Consecutive Ones | Easy | Core DSA | Implementation / Reasoning | 65.2% | 50.0% | all |
| 215 | Kth Largest Element in an Array | Medium | Arrays; Heap | Sorting / Prefix / Scan; Priority Queue | 68.9% | 50.0% | all |
| 183 | Customers Who Never Order | Easy | Core DSA | Implementation / Reasoning | 71.8% | 50.0% | all |
| 13 | Roman to Integer | Easy | Strings | Hashing / Sliding Window | 66.6% | 50.0% | all |
| 177 | Nth Highest Salary | Medium | Core DSA | Implementation / Reasoning | 39.2% | 50.0% | all |
| 493 | Reverse Pairs | Hard | Core DSA | Implementation / Reasoning | 34.2% | 50.0% | all |
| 49 | Group Anagrams | Medium | Strings | Hashing / Sliding Window | 72.6% | 50.0% | all |
| 128 | Longest Consecutive Sequence | Medium | Core DSA | Implementation / Reasoning | 47.1% | 50.0% | all |
| 3703 | Remove K-Balanced Substrings | Medium | Strings; Trees | Hashing / Sliding Window; DFS / BFS | 32.7% | 50.0% | all |
| 410 | Split Array Largest Sum | Hard | Arrays | Sorting / Prefix / Scan | 60.4% | 50.0% | all |
| 581 | Shortest Unsorted Continuous Subarray | Medium | Arrays | Sorting / Prefix / Scan | 38.2% | 50.0% | all |
| 189 | Rotate Array | Medium | Arrays | Sorting / Prefix / Scan | 44.9% | 50.0% | all |
| 242 | Valid Anagram | Easy | Strings | Hashing / Sliding Window | 68.1% | 50.0% | all |
| 1047 | Remove All Adjacent Duplicates In String | Easy | Arrays; Strings | Sorting / Prefix / Scan; Hashing / Sliding Window | 73.2% | 50.0% | all |
| 560 | Subarray Sum Equals K | Medium | Arrays | Sorting / Prefix / Scan | 47.3% | 50.0% | all |
| 125 | Valid Palindrome | Easy | Strings | Hashing / Sliding Window | 53.3% | 50.0% | all |
| 31 | Next Permutation | Medium | Backtracking | Backtracking | 45.3% | 50.0% | all |