Citadel vs Walmart Labs Interview Questions
Citadel lists 101 LeetCode interview questions while Walmart Labs lists 144. They share 32 problems — 32% of Citadel's bank and 22% of Walmart Labs's. Focus on the overlap first, then drill into 69 Citadel-only and 112 Walmart Labs-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 32 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Citadel and Walmart Labs.
Step 2 — Company-specific depth: Add Citadel-specific problems like Longest Non-decreasing Subarray From Two Arrays, Binary Tree Maximum Path Sum, Minimum Knight Moves and Walmart Labs-specific problems from the exclusive lists below.
Step 3 — Difficulty tuning: Citadel skews harder in our data. Budget extra time for Hard problems if you are targeting that company.
Difficulty Comparison
Top Shared Topics
32 Shared Questions
High-priority problems to practice for both Citadel and Walmart Labs.
| Problem | Difficulty |
|---|---|
| Palindromic Substrings | Medium |
| Sliding Window Maximum | Hard |
| LFU Cache | Hard |
| LRU Cache | Medium |
| Merge Intervals | Medium |
| Best Time to Buy and Sell Stock | Easy |
| Find the Duplicate Number | Medium |
| Number of Islands | Medium |
| Find Median from Data Stream | Hard |
| Group Anagrams | Medium |
| Merge k Sorted Lists | Hard |
| Binary Tree Zigzag Level Order Traversal | Medium |
| Trapping Rain Water | Hard |
| Best Time to Buy and Sell Stock II | Medium |
| Combination Sum | Medium |
| Perfect Squares | Medium |
| Median of Two Sorted Arrays | Hard |
| House Robber | Medium |
| 3Sum | Medium |
| Word Search | Medium |
| Asteroid Collision | Medium |
| Longest Common Subsequence | Medium |
| Container With Most Water | Medium |
| Pow(x, n) | Medium |
| Longest Increasing Subsequence | Medium |
| Rotting Oranges | Medium |
| Bus Routes | Hard |
| Populating Next Right Pointers in Each Node | Medium |
| Basic Calculator | Hard |
| Course Schedule II | Medium |
Showing top 30 of 32 shared problems.
Unique to Citadel (69)
Problems in Citadel's list that do not appear at Walmart Labs.
Unique to Walmart Labs (112)
Problems in Walmart Labs's list that do not appear at Citadel.
Frequently Asked Questions
How many LeetCode questions do Citadel and Walmart Labs share?
Citadel and Walmart Labs share 32 LeetCode interview questions. 69 problems appear only in Citadel's list and 112 appear only in Walmart Labs's list.
What topics overlap most between Citadel and Walmart Labs?
The most common shared topics between Citadel and Walmart Labs are Array (18 shared questions), Dynamic Programming (8 shared questions), Breadth-First Search (7 shared questions), Two Pointers (6 shared questions), String (5 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Citadel or Walmart Labs?
Citadel has 5 Easy, 60 Medium, and 36 Hard questions. Walmart Labs has 22 Easy, 96 Medium, and 26 Hard questions. Citadel has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Citadel and Walmart Labs?
Start with the 32 shared problems since they cover what both companies ask most often. Then add 20 Citadel-specific and 20 Walmart Labs-specific questions to round out your prep.