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Epam Systems DSA Interview Questions
50 curated coding interview questions directly asked in Epam Systems technical rounds, sorted by frequency with recency and difficulty diagnostics.
50
Total Questions
17 (34%)
Easy Problems
30 (60%)
Medium Problems
3 (6%)
Hard Problems
🔥 Most Tested Topics:
Arrays (18)Strings (15)Core DSA (12)Dynamic Programming (4)Trees (3)
📂 Sourced Datasets:
Last 6 monthsAll questionsOlder than 6 months
| ID | Problem | Difficulty | Topic | Pattern | Acceptance | Frequency | Recency |
|---|---|---|---|---|---|---|---|
| 283 | Move Zeroes | Easy | Core DSA | Two Pointers | 63.8% | 100.0% | 6m |
| 1 | Two Sum | Easy | Arrays | Sorting / Prefix / Scan; Two Pointers | 57.5% | 87.5% | 6m |
| 88 | Merge Sorted Array | Easy | Arrays | Sorting / Prefix / Scan | 54.9% | 87.5% | 6m |
| 49 | Group Anagrams | Medium | Strings | Hashing / Sliding Window | 72.6% | 87.5% | 6m |
| 3 | Longest Substring Without Repeating Characters | Medium | Strings; Trees | Hashing / Sliding Window; DFS / BFS; Sliding Window | 39.1% | 87.5% | 6m |
| 5 | Longest Palindromic Substring | Medium | Strings; Trees | Hashing / Sliding Window; DFS / BFS | 37.8% | 87.5% | 6m |
| 146 | LRU Cache | Medium | Design | Data Structure Design | 47.4% | 87.5% | 6m |
| 20 | Valid Parentheses | Easy | Strings | Hashing / Sliding Window | 44.2% | 87.5% | all |
| 2033 | Minimum Operations to Make a Uni-Value Grid | Medium | Arrays | Sorting / Prefix / Scan | 70.7% | 87.5% | all |
| 14 | Longest Common Prefix | Easy | Core DSA | Implementation / Reasoning | 47.6% | 87.5% | all |
| 121 | Best Time to Buy and Sell Stock | Easy | Core DSA | Implementation / Reasoning | 56.8% | 75.0% | all |
| 242 | Valid Anagram | Easy | Strings | Hashing / Sliding Window | 68.1% | 75.0% | all |
| 189 | Rotate Array | Medium | Arrays | Sorting / Prefix / Scan | 44.9% | 75.0% | all |
| 42 | Trapping Rain Water | Hard | Core DSA | Two Pointers | 67.4% | 62.5% | all |
| 198 | House Robber | Medium | Dynamic Programming | State Transition | 53.2% | 62.5% | all |
| 416 | Partition Equal Subset Sum | Medium | Arrays; Dynamic Programming | Sorting / Prefix / Scan; State Transition | 49.5% | 62.5% | all |
| 1026 | Maximum Difference Between Node and Ancestor | Medium | Arrays; Trees | Sorting / Prefix / Scan; DFS / BFS | 78.2% | 62.5% | all |
| 128 | Longest Consecutive Sequence | Medium | Core DSA | Implementation / Reasoning | 47.1% | 62.5% | all |
| 443 | String Compression | Medium | Strings | Hashing / Sliding Window | 60.0% | 62.5% | all |
| 344 | Reverse String | Easy | Strings | Hashing / Sliding Window | 80.8% | 62.5% | all |
| 387 | First Unique Character in a String | Easy | Strings | Hashing / Sliding Window | 65.5% | 62.5% | all |
| 56 | Merge Intervals | Medium | Arrays | Sorting / Prefix / Scan | 51.8% | 62.5% | all |
| 22 | Generate Parentheses | Medium | Strings | Hashing / Sliding Window | 78.7% | 62.5% | all |
| 345 | Reverse Vowels of a String | Easy | Strings | Hashing / Sliding Window | 61.3% | 62.5% | all |
| 43 | Multiply Strings | Medium | Strings | Hashing / Sliding Window | 44.2% | 62.5% | all |
| 2 | Add Two Numbers | Medium | Core DSA | Implementation / Reasoning | 48.5% | 50.0% | all |
| 9 | Palindrome Number | Easy | Strings | Hashing / Sliding Window | 60.6% | 50.0% | all |
| 15 | 3Sum | Medium | Arrays | Sorting / Prefix / Scan | 39.1% | 50.0% | all |
| 735 | Asteroid Collision | Medium | Core DSA | Implementation / Reasoning | 47.9% | 50.0% | all |
| 322 | Coin Change | Medium | Dynamic Programming | State Transition | 48.4% | 50.0% | all |
| 7 | Reverse Integer | Medium | Core DSA | Implementation / Reasoning | 31.9% | 50.0% | all |
| 167 | Two Sum II - Input Array Is Sorted | Medium | Arrays | Sorting / Prefix / Scan; Two Pointers | 65.1% | 50.0% | all |
| 50 | Pow(x, n) | Medium | Core DSA | Implementation / Reasoning | 38.7% | 50.0% | all |
| 182 | Duplicate Emails | Easy | Arrays | Sorting / Prefix / Scan | 73.8% | 50.0% | all |
| 1907 | Count Salary Categories | Medium | Core DSA | Implementation / Reasoning | 64.4% | 50.0% | all |
| 26 | Remove Duplicates from Sorted Array | Easy | Arrays | Sorting / Prefix / Scan; Two Pointers | 62.8% | 50.0% | all |
| 53 | Maximum Subarray | Medium | Arrays | Sorting / Prefix / Scan | 53.3% | 50.0% | all |
| 151 | Reverse Words in a String | Medium | Strings | Hashing / Sliding Window | 56.4% | 50.0% | all |
| 62 | Unique Paths | Medium | Core DSA | Implementation / Reasoning | 66.8% | 50.0% | all |
| 72 | Edit Distance | Medium | Dynamic Programming | State Transition | 60.6% | 50.0% | all |
| 13 | Roman to Integer | Easy | Strings | Hashing / Sliding Window | 66.6% | 50.0% | all |
| 2620 | Counter | Easy | Core DSA | Implementation / Reasoning | 82.4% | 50.0% | all |
| 206 | Reverse Linked List | Easy | Linked List | Two Pointers | 80.6% | 50.0% | all |
| 451 | Sort Characters By Frequency | Medium | Arrays; Strings | Sorting / Prefix / Scan; Hashing / Sliding Window | 75.3% | 50.0% | all |
| 347 | Top K Frequent Elements | Medium | Heap | Priority Queue | 66.4% | 50.0% | all |
| 215 | Kth Largest Element in an Array | Medium | Arrays; Heap | Sorting / Prefix / Scan; Priority Queue | 68.9% | 50.0% | all |
| 41 | First Missing Positive | Hard | Arrays | Sorting / Prefix / Scan | 42.9% | 50.0% | all |
| 4 | Median of Two Sorted Arrays | Hard | Arrays; Heap | Sorting / Prefix / Scan; Priority Queue | 46.6% | 50.0% | all |
| 21 | Merge Two Sorted Lists | Easy | Arrays; Linked List | Sorting / Prefix / Scan; Two Pointers | 68.3% | 50.0% | all |
| 54 | Spiral Matrix | Medium | Arrays | Sorting / Prefix / Scan | 56.8% | 50.0% | all |