American Express vs Walmart Labs Interview Questions
American Express lists 23 LeetCode interview questions while Walmart Labs lists 144. They share 6 problems — 26% of American Express's bank and 4% of Walmart Labs's. Focus on the overlap first, then drill into 17 American Express-only and 138 Walmart Labs-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 6 overlapping problems first. These are the highest-yield questions for candidates interviewing at both American Express and Walmart Labs.
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 Walmart Labs-specific problems from the exclusive lists below.
Step 3 — Difficulty tuning: Walmart Labs skews harder in our data. Budget extra time for Hard problems if you are targeting that company.
Difficulty Comparison
Top Shared Topics
6 Shared Questions
High-priority problems to practice for both American Express and Walmart Labs.
| Problem | Difficulty |
|---|---|
| Two Sum | 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 (17)
Problems in American Express's list that do not appear at Walmart Labs.
Unique to Walmart Labs (138)
Problems in Walmart Labs's list that do not appear at American Express.
| Problem | Difficulty |
|---|---|
| Number of Islands | Medium |
| LRU Cache | Medium |
| Valid Parentheses | Easy |
| Trapping Rain Water | Hard |
| Generate Parentheses | Medium |
| Merge Intervals | Medium |
| Search in Rotated Sorted Array | Medium |
| Divide Intervals Into Minimum Number of Groups | Medium |
| Middle of the Linked List | Easy |
| Maximum Number of Tasks You Can Assign | Hard |
| The Winner University | Easy |
| Count Good Triplets in an Array | Hard |
Frequently Asked Questions
How many LeetCode questions do American Express and Walmart Labs share?
American Express and Walmart Labs share 6 LeetCode interview questions. 17 problems appear only in American Express's list and 138 appear only in Walmart Labs's list.
What topics overlap most between American Express and Walmart Labs?
The most common shared topics between American Express and Walmart Labs are Array (5 shared questions), Hash Table (2 shared questions), String (2 shared questions), Two Pointers (2 shared questions), Sliding Window (1 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: American Express or Walmart Labs?
American Express has 8 Easy, 12 Medium, and 3 Hard questions. Walmart Labs has 22 Easy, 96 Medium, and 26 Hard questions. Walmart Labs has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both American Express and Walmart Labs?
Start with the 6 shared problems since they cover what both companies ask most often. Then add 17 American Express-specific and 20 Walmart Labs-specific questions to round out your prep.