TCS vs X Interview Questions
TCS lists 228 LeetCode interview questions while X lists 51. They share 12 problems — 5% of TCS's bank and 24% of X's. Focus on the overlap first, then drill into 216 TCS-only and 39 X-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 12 overlapping problems first. These are the highest-yield questions for candidates interviewing at both TCS and X.
Step 2 — Company-specific depth: Add TCS-specific problems like Friday Purchases I, Two Sum, Longest Palindromic Substring 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
12 Shared Questions
High-priority problems to practice for both TCS and X.
| Problem | Difficulty |
|---|---|
| Valid Parentheses | Easy |
| Trapping Rain Water | Hard |
| Merge Intervals | Medium |
| Pascal's Triangle | Easy |
| Happy Number | Easy |
| Merge k Sorted Lists | Hard |
| LRU Cache | Medium |
| Reverse Linked List | Easy |
| Remove All Occurrences of a Substring | Medium |
| Regular Expression Matching | Hard |
| Integer to Roman | Medium |
| Multiply Strings | Medium |
Unique to TCS (216)
Problems in TCS's list that do not appear at X.
| Problem | Difficulty |
|---|---|
| Friday Purchases I | Medium |
| Two Sum | Easy |
| Longest Palindromic Substring | Medium |
| Palindrome Number | Easy |
| Maximum Subarray | Medium |
| Move Zeroes | Easy |
| Majority Element | Easy |
| Longest Common Prefix | Easy |
| Best Time to Buy and Sell Stock | Easy |
| Sort Colors | Medium |
| Valid Anagram | Easy |
| Find the Index of the First Occurrence in a String | Easy |
Unique to X (39)
Problems in X's list that do not appear at TCS.
| 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 |
| Word Break II | Hard |
| Alien Dictionary | Hard |
| Time Needed to Buy Tickets | Easy |
| Max Points on a Line | Hard |
| Trapping Rain Water II | Hard |
| Finding the Users Active Minutes | Medium |
Frequently Asked Questions
How many LeetCode questions do TCS and X share?
TCS and X share 12 LeetCode interview questions. 216 problems appear only in TCS's list and 39 appear only in X's list.
What topics overlap most between TCS and X?
The most common shared topics between TCS and X are String (5 shared questions), Stack (3 shared questions), Array (3 shared questions), Dynamic Programming (3 shared questions), Hash Table (3 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: TCS or X?
TCS has 99 Easy, 108 Medium, and 21 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 TCS and X?
Start with the 12 shared problems since they cover what both companies ask most often. Then add 20 TCS-specific and 20 X-specific questions to round out your prep.