Cognizant vs TCS Interview Questions
Cognizant lists 29 LeetCode interview questions while TCS lists 228. They share 25 problems — 86% of Cognizant's bank and 11% of TCS's. Focus on the overlap first, then drill into 4 Cognizant-only and 203 TCS-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 25 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Cognizant and TCS.
Step 2 — Company-specific depth: Add Cognizant-specific problems like Count Subarrays of Length Three With a Condition, Smallest Value of the Rearranged Number, Rising Temperature and TCS-specific problems from the exclusive lists below.
Step 3 — Difficulty tuning: TCS skews harder in our data. Budget extra time for Hard problems if you are targeting that company.
Difficulty Comparison
Top Shared Topics
25 Shared Questions
High-priority problems to practice for both Cognizant and TCS.
| Problem | Difficulty |
|---|---|
| Palindrome Number | Easy |
| Two Sum | Easy |
| Fibonacci Number | Easy |
| Longest Palindromic Substring | Medium |
| Valid Anagram | Easy |
| Second Highest Salary | Medium |
| Remove Duplicates from Sorted Array | Easy |
| Longest Common Prefix | Easy |
| Managers with at Least 5 Direct Reports | Medium |
| Maximum Subarray | Medium |
| Reverse Integer | Medium |
| Product Sales Analysis I | Easy |
| Valid Parentheses | Easy |
| Median of Two Sorted Arrays | Hard |
| Longest Substring Without Repeating Characters | Medium |
| Merge Sorted Array | Easy |
| Count Primes | Medium |
| 3Sum | Medium |
| Happy Number | Easy |
| Move Zeroes | Easy |
| Binary Search | Easy |
| Merge Two Sorted Lists | Easy |
| Add Two Numbers | Medium |
| Fizz Buzz | Easy |
| Search Insert Position | Easy |
Unique to Cognizant (4)
Problems in Cognizant's list that do not appear at TCS.
| Problem | Difficulty |
|---|---|
| Count Subarrays of Length Three With a Condition | Easy |
| Smallest Value of the Rearranged Number | Medium |
| Rising Temperature | Easy |
| Students and Examinations | Easy |
Unique to TCS (203)
Problems in TCS's list that do not appear at Cognizant.
| Problem | Difficulty |
|---|---|
| Friday Purchases I | Medium |
| Majority Element | Easy |
| Best Time to Buy and Sell Stock | Easy |
| Sort Colors | Medium |
| Find the Index of the First Occurrence in a String | Easy |
| Single Number | Easy |
| Subarray Sum Equals K | Medium |
| Rotate Array | Medium |
| Container With Most Water | Medium |
| Jump Game | Medium |
| Contains Duplicate | Easy |
| Remove Letter To Equalize Frequency | Easy |
Frequently Asked Questions
How many LeetCode questions do Cognizant and TCS share?
Cognizant and TCS share 25 LeetCode interview questions. 4 problems appear only in Cognizant's list and 203 appear only in TCS's list.
What topics overlap most between Cognizant and TCS?
The most common shared topics between Cognizant and TCS are Array (10 shared questions), Math (7 shared questions), Two Pointers (6 shared questions), String (6 shared questions), Hash Table (4 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Cognizant or TCS?
Cognizant has 18 Easy, 10 Medium, and 1 Hard questions. TCS has 99 Easy, 108 Medium, and 21 Hard questions. TCS has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Cognizant and TCS?
Start with the 25 shared problems since they cover what both companies ask most often. Then add 4 Cognizant-specific and 20 TCS-specific questions to round out your prep.