Epam Systems vs X Interview Questions
Epam Systems lists 46 LeetCode interview questions while X lists 51. They share 6 problems — 13% of Epam Systems's bank and 12% of X's. Focus on the overlap first, then drill into 40 Epam Systems-only and 45 X-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 6 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Epam Systems and X.
Step 2 — Company-specific depth: Add Epam Systems-specific problems like Two Sum, Longest Substring Without Repeating Characters, Minimum Operations to Make a Uni-Value Grid and X-specific problems from the exclusive lists below.
Step 3 — Difficulty tuning: X skews harder in our data. Budget extra time for Hard problems if you are targeting that company.
Difficulty Comparison
Top Shared Topics
6 Shared Questions
High-priority problems to practice for both Epam Systems and X.
| Problem | Difficulty |
|---|---|
| Valid Parentheses | Easy |
| Trapping Rain Water | Hard |
| Merge Intervals | Medium |
| LRU Cache | Medium |
| Multiply Strings | Medium |
| Reverse Linked List | Easy |
Unique to Epam Systems (40)
Problems in Epam Systems's list that do not appear at X.
| Problem | Difficulty |
|---|---|
| Two Sum | Easy |
| Longest Substring Without Repeating Characters | Medium |
| Minimum Operations to Make a Uni-Value Grid | Medium |
| Move Zeroes | Easy |
| Longest Common Prefix | Easy |
| Longest Palindromic Substring | Medium |
| Merge Sorted Array | Easy |
| Valid Anagram | Easy |
| Best Time to Buy and Sell Stock | Easy |
| Group Anagrams | Medium |
| Rotate Array | Medium |
| Reverse String | Easy |
Unique to X (45)
Problems in X's list that do not appear at Epam Systems.
| Problem | Difficulty |
|---|---|
| Tweet Counts Per Frequency | Medium |
| Flatten Nested List Iterator | Medium |
| Implement Trie (Prefix Tree) | Medium |
| Insert Delete GetRandom O(1) | Medium |
| Design Twitter | Medium |
| Binary Gap | Easy |
| Regular Expression Matching | Hard |
| Integer to Roman | Medium |
| Word Break II | Hard |
| Alien Dictionary | Hard |
| Time Needed to Buy Tickets | Easy |
| Max Points on a Line | Hard |
Frequently Asked Questions
How many LeetCode questions do Epam Systems and X share?
Epam Systems and X share 6 LeetCode interview questions. 40 problems appear only in Epam Systems's list and 45 appear only in X's list.
What topics overlap most between Epam Systems and X?
The most common shared topics between Epam Systems and X are String (2 shared questions), Stack (2 shared questions), Array (2 shared questions), Linked List (2 shared questions), Two Pointers (1 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Epam Systems or X?
Epam Systems has 16 Easy, 27 Medium, and 3 Hard questions. X has 8 Easy, 31 Medium, and 12 Hard questions. X has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Epam Systems and X?
Start with the 6 shared problems since they cover what both companies ask most often. Then add 20 Epam Systems-specific and 20 X-specific questions to round out your prep.