Epam Systems vs Oracle Interview Questions
Epam Systems lists 46 LeetCode interview questions while Oracle lists 314. They share 37 problems — 80% of Epam Systems's bank and 12% of Oracle's. Focus on the overlap first, then drill into 9 Epam Systems-only and 277 Oracle-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 37 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Epam Systems and Oracle.
Step 2 — Company-specific depth: Add Epam Systems-specific problems like Minimum Operations to Make a Uni-Value Grid, Reverse String, Partition Equal Subset Sum and Oracle-specific problems from the exclusive lists below.
Step 3 — Difficulty tuning: Oracle skews harder in our data. Budget extra time for Hard problems if you are targeting that company.
Difficulty Comparison
Top Shared Topics
37 Shared Questions
High-priority problems to practice for both Epam Systems and Oracle.
| Problem | Difficulty |
|---|---|
| Two Sum | Easy |
| Longest Substring Without Repeating Characters | Medium |
| Valid Parentheses | Easy |
| 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 |
| House Robber | Medium |
| Longest Consecutive Sequence | Medium |
| String Compression | Medium |
| Trapping Rain Water | Hard |
| Reverse Vowels of a String | Easy |
| 3Sum | Medium |
| First Unique Character in a String | Easy |
| Merge Intervals | Medium |
| Generate Parentheses | Medium |
| LRU Cache | Medium |
| Add Two Numbers | Medium |
| Palindrome Number | Easy |
| Reverse Integer | Medium |
| Pow(x, n) | Medium |
| Two Sum II - Input Array Is Sorted | Medium |
| Roman to Integer | Easy |
| Maximum Subarray | Medium |
| First Missing Positive | Hard |
| Multiply Strings | Medium |
Showing top 30 of 37 shared problems.
Unique to Epam Systems (9)
Problems in Epam Systems's list that do not appear at Oracle.
| Problem | Difficulty |
|---|---|
| Minimum Operations to Make a Uni-Value Grid | Medium |
| Reverse String | Easy |
| Partition Equal Subset Sum | Medium |
| Maximum Difference Between Node and Ancestor | Medium |
| Duplicate Emails | Easy |
| Count Salary Categories | Medium |
| Unique Paths | Medium |
| Counter | Easy |
| Sort Characters By Frequency | Medium |
Unique to Oracle (277)
Problems in Oracle's list that do not appear at Epam Systems.
| Problem | Difficulty |
|---|---|
| Number of Islands | Medium |
| Sliding Window Maximum | Hard |
| Merge k Sorted Lists | Hard |
| Meeting Rooms II | Medium |
| Spiral Matrix | Medium |
| Minimum One Bit Operations to Make Integers Zero | Hard |
| LFU Cache | Hard |
| Search in Rotated Sorted Array | Medium |
| Asteroid Collision | Medium |
| Remove All Adjacent Duplicates in String II | Medium |
| Container With Most Water | Medium |
| Min Stack | Medium |
Frequently Asked Questions
How many LeetCode questions do Epam Systems and Oracle share?
Epam Systems and Oracle share 37 LeetCode interview questions. 9 problems appear only in Epam Systems's list and 277 appear only in Oracle's list.
What topics overlap most between Epam Systems and Oracle?
The most common shared topics between Epam Systems and Oracle are Array (15 shared questions), String (12 shared questions), Hash Table (9 shared questions), Two Pointers (9 shared questions), Math (7 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Epam Systems or Oracle?
Epam Systems has 16 Easy, 27 Medium, and 3 Hard questions. Oracle has 61 Easy, 194 Medium, and 59 Hard questions. Oracle has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Epam Systems and Oracle?
Start with the 37 shared problems since they cover what both companies ask most often. Then add 9 Epam Systems-specific and 20 Oracle-specific questions to round out your prep.