Cognizant vs Epam Systems Interview Questions
Cognizant lists 29 LeetCode interview questions while Epam Systems lists 46. They share 15 problems — 52% of Cognizant's bank and 33% of Epam Systems's. Focus on the overlap first, then drill into 14 Cognizant-only and 31 Epam Systems-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 15 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Cognizant and Epam Systems.
Step 2 — Company-specific depth: Add Cognizant-specific problems like Count Subarrays of Length Three With a Condition, Smallest Value of the Rearranged Number, Fibonacci Number and Epam Systems-specific problems from the exclusive lists below.
Step 3 — Difficulty tuning: Epam Systems skews harder in our data. Budget extra time for Hard problems if you are targeting that company.
Difficulty Comparison
Top Shared Topics
15 Shared Questions
High-priority problems to practice for both Cognizant and Epam Systems.
| Problem | Difficulty |
|---|---|
| Palindrome Number | Easy |
| Two Sum | Easy |
| Longest Palindromic Substring | Medium |
| Valid Anagram | Easy |
| Longest Common Prefix | Easy |
| Maximum Subarray | Medium |
| Reverse Integer | Medium |
| Valid Parentheses | Easy |
| Median of Two Sorted Arrays | Hard |
| Longest Substring Without Repeating Characters | Medium |
| Merge Sorted Array | Easy |
| 3Sum | Medium |
| Move Zeroes | Easy |
| Merge Two Sorted Lists | Easy |
| Add Two Numbers | Medium |
Unique to Cognizant (14)
Problems in Cognizant's list that do not appear at Epam Systems.
| Problem | Difficulty |
|---|---|
| Count Subarrays of Length Three With a Condition | Easy |
| Smallest Value of the Rearranged Number | Medium |
| Fibonacci Number | Easy |
| Second Highest Salary | Medium |
| Remove Duplicates from Sorted Array | Easy |
| Managers with at Least 5 Direct Reports | Medium |
| Product Sales Analysis I | Easy |
| Count Primes | Medium |
| Happy Number | Easy |
| Binary Search | Easy |
| Fizz Buzz | Easy |
| Rising Temperature | Easy |
Unique to Epam Systems (31)
Problems in Epam Systems's list that do not appear at Cognizant.
| Problem | Difficulty |
|---|---|
| Minimum Operations to Make a Uni-Value Grid | Medium |
| Best Time to Buy and Sell Stock | Easy |
| Group Anagrams | Medium |
| Rotate Array | Medium |
| Reverse String | Easy |
| House Robber | Medium |
| Partition Equal Subset Sum | Medium |
| Longest Consecutive Sequence | Medium |
| String Compression | Medium |
| Trapping Rain Water | Hard |
| Reverse Vowels of a String | Easy |
| First Unique Character in a String | Easy |
Frequently Asked Questions
How many LeetCode questions do Cognizant and Epam Systems share?
Cognizant and Epam Systems share 15 LeetCode interview questions. 14 problems appear only in Cognizant's list and 31 appear only in Epam Systems's list.
What topics overlap most between Cognizant and Epam Systems?
The most common shared topics between Cognizant and Epam Systems are Array (6 shared questions), String (5 shared questions), Two Pointers (4 shared questions), Math (3 shared questions), Hash Table (3 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Cognizant or Epam Systems?
Cognizant has 18 Easy, 10 Medium, and 1 Hard questions. Epam Systems has 16 Easy, 27 Medium, and 3 Hard questions. Epam Systems has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Cognizant and Epam Systems?
Start with the 15 shared problems since they cover what both companies ask most often. Then add 14 Cognizant-specific and 20 Epam Systems-specific questions to round out your prep.