American Express vs TCS Interview Questions
American Express lists 23 LeetCode interview questions while TCS lists 228. They share 10 problems — 43% of American Express's bank and 4% of TCS's. Focus on the overlap first, then drill into 13 American Express-only and 218 TCS-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 10 overlapping problems first. These are the highest-yield questions for candidates interviewing at both American Express and TCS.
Step 2 — Company-specific depth: Add American Express-specific problems like Minimum Deletions to Make Character Frequencies Unique, Maximum Equal Frequency, Divide an Array Into Subarrays With Minimum Cost II and TCS-specific problems from the exclusive lists below.
Step 3 — Difficulty tuning: American Express skews harder in our data. Budget extra time for Hard problems if you are targeting that company.
Difficulty Comparison
Top Shared Topics
10 Shared Questions
High-priority problems to practice for both American Express and TCS.
| Problem | Difficulty |
|---|---|
| Two Sum | Easy |
| Valid Anagram | Easy |
| Longest Substring Without Repeating Characters | Medium |
| Best Time to Buy and Sell Stock | Easy |
| 3Sum | Medium |
| Rotate Array | Medium |
| Permutations | Medium |
| Linked List Cycle II | Medium |
| Longest Common Prefix | Easy |
| Consecutive Numbers | Medium |
Unique to American Express (13)
Problems in American Express's list that do not appear at TCS.
Unique to TCS (218)
Problems in TCS's list that do not appear at American Express.
| Problem | Difficulty |
|---|---|
| Friday Purchases I | Medium |
| Longest Palindromic Substring | Medium |
| Palindrome Number | Easy |
| Maximum Subarray | Medium |
| Move Zeroes | Easy |
| Majority Element | Easy |
| Sort Colors | Medium |
| Find the Index of the First Occurrence in a String | Easy |
| Single Number | Easy |
| Second Highest Salary | Medium |
| Valid Parentheses | Easy |
| Subarray Sum Equals K | Medium |
Frequently Asked Questions
How many LeetCode questions do American Express and TCS share?
American Express and TCS share 10 LeetCode interview questions. 13 problems appear only in American Express's list and 218 appear only in TCS's list.
What topics overlap most between American Express and TCS?
The most common shared topics between American Express and TCS are Array (6 shared questions), Hash Table (4 shared questions), String (3 shared questions), Two Pointers (3 shared questions), Sorting (2 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: American Express or TCS?
American Express has 8 Easy, 12 Medium, and 3 Hard questions. TCS has 99 Easy, 108 Medium, and 21 Hard questions. American Express has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both American Express and TCS?
Start with the 10 shared problems since they cover what both companies ask most often. Then add 13 American Express-specific and 20 TCS-specific questions to round out your prep.