IBM vs TCS Interview Questions
IBM lists 115 LeetCode interview questions while TCS lists 228. They share 45 problems — 39% of IBM's bank and 20% of TCS's. Focus on the overlap first, then drill into 70 IBM-only and 183 TCS-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 45 overlapping problems first. These are the highest-yield questions for candidates interviewing at both IBM and TCS.
Step 2 — Company-specific depth: Add IBM-specific problems like Find the Smallest Divisor Given a Threshold, Gray Code, Exclusive Time of Functions 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
45 Shared Questions
High-priority problems to practice for both IBM and TCS.
| Problem | Difficulty |
|---|---|
| 3Sum | Medium |
| Integer to Roman | Medium |
| Fizz Buzz | Easy |
| Roman to Integer | Easy |
| Best Time to Buy and Sell Stock | Easy |
| Two Sum | Easy |
| Rotate Image | Medium |
| Find Pivot Index | Easy |
| The kth Factor of n | Medium |
| Merge Intervals | Medium |
| Longest Substring Without Repeating Characters | Medium |
| String Compression | Medium |
| Longest Common Prefix | Easy |
| Valid Parentheses | Easy |
| Letter Combinations of a Phone Number | Medium |
| Maximum Sum of Distinct Subarrays With Length K | Medium |
| Longest Consecutive Sequence | Medium |
| Longest Palindromic Substring | Medium |
| Merge Sorted Array | Easy |
| Maximum Subarray | Medium |
| Spiral Matrix | Medium |
| Group Anagrams | Medium |
| Subarray Product Less Than K | Medium |
| Climbing Stairs | Easy |
| Trapping Rain Water | Hard |
| Product of Array Except Self | Medium |
| Next Permutation | Medium |
| Find the Index of the First Occurrence in a String | Easy |
| Longest Increasing Subsequence | Medium |
| Subarray Sum Equals K | Medium |
Showing top 30 of 45 shared problems.
Unique to IBM (70)
Problems in IBM's list that do not appear at TCS.
Unique to TCS (183)
Problems in TCS's list that do not appear at IBM.
| Problem | Difficulty |
|---|---|
| Friday Purchases I | Medium |
| Move Zeroes | Easy |
| Sort Colors | Medium |
| Valid Anagram | Easy |
| Single Number | Easy |
| Second Highest Salary | Medium |
| Container With Most Water | Medium |
| Jump Game | Medium |
| Contains Duplicate | Easy |
| Remove Letter To Equalize Frequency | Easy |
| Maximum Ascending Subarray Sum | Easy |
| Count the Digits That Divide a Number | Easy |
Frequently Asked Questions
How many LeetCode questions do IBM and TCS share?
IBM and TCS share 45 LeetCode interview questions. 70 problems appear only in IBM's list and 183 appear only in TCS's list.
What topics overlap most between IBM and TCS?
The most common shared topics between IBM and TCS are Array (18 shared questions), String (11 shared questions), Hash Table (9 shared questions), Two Pointers (7 shared questions), Math (6 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: IBM or TCS?
IBM has 33 Easy, 73 Medium, and 9 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 IBM and TCS?
Start with the 45 shared problems since they cover what both companies ask most often. Then add 20 IBM-specific and 20 TCS-specific questions to round out your prep.