American Express vs Deloitte Interview Questions
American Express lists 23 LeetCode interview questions while Deloitte lists 43. They share 7 problems — 30% of American Express's bank and 16% of Deloitte's. Focus on the overlap first, then drill into 16 American Express-only and 36 Deloitte-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 7 overlapping problems first. These are the highest-yield questions for candidates interviewing at both American Express and Deloitte.
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 Deloitte-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
7 Shared Questions
High-priority problems to practice for both American Express and Deloitte.
| 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 |
| Longest Common Prefix | Easy |
Unique to American Express (16)
Problems in American Express's list that do not appear at Deloitte.
Unique to Deloitte (36)
Problems in Deloitte's list that do not appear at American Express.
| Problem | Difficulty |
|---|---|
| Merge k Sorted Lists | Hard |
| Change Null Values in a Table to the Previous Value | Medium |
| Second Highest Salary | Medium |
| Valid Parentheses | Easy |
| Longest Palindromic Substring | Medium |
| Container With Most Water | Medium |
| Palindrome Number | Easy |
| Climbing Stairs | Easy |
| Valid Palindrome | Easy |
| Add Binary | Easy |
| Managers with at Least 5 Direct Reports | Medium |
| Minimum Time to Repair Cars | Medium |
Frequently Asked Questions
How many LeetCode questions do American Express and Deloitte share?
American Express and Deloitte share 7 LeetCode interview questions. 16 problems appear only in American Express's list and 36 appear only in Deloitte's list.
What topics overlap most between American Express and Deloitte?
The most common shared topics between American Express and Deloitte are Array (5 shared questions), Hash Table (3 shared questions), String (3 shared questions), Sorting (2 shared questions), Two Pointers (2 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: American Express or Deloitte?
American Express has 8 Easy, 12 Medium, and 3 Hard questions. Deloitte has 17 Easy, 23 Medium, and 3 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 Deloitte?
Start with the 7 shared problems since they cover what both companies ask most often. Then add 16 American Express-specific and 20 Deloitte-specific questions to round out your prep.