Citadel vs Expedia Interview Questions
Citadel lists 101 LeetCode interview questions while Expedia lists 64. They share 16 problems — 16% of Citadel's bank and 25% of Expedia's. Focus on the overlap first, then drill into 85 Citadel-only and 48 Expedia-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 16 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Citadel and Expedia.
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 Expedia-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
16 Shared Questions
High-priority problems to practice for both Citadel and Expedia.
| Problem | Difficulty |
|---|---|
| Sliding Window Maximum | Hard |
| LFU Cache | Hard |
| Number of Good Binary Strings | Medium |
| LRU Cache | Medium |
| Merge Intervals | Medium |
| Best Time to Buy and Sell Stock | Easy |
| Number of Islands | Medium |
| Group Anagrams | Medium |
| Validate Binary Search Tree | Medium |
| Trapping Rain Water | Hard |
| Letter Combinations of a Phone Number | Medium |
| House Robber | Medium |
| Container With Most Water | Medium |
| Rotting Oranges | Medium |
| Reorganize String | Medium |
| Koko Eating Bananas | Medium |
Unique to Citadel (85)
Problems in Citadel's list that do not appear at Expedia.
Unique to Expedia (48)
Problems in Expedia's list that do not appear at Citadel.
Frequently Asked Questions
How many LeetCode questions do Citadel and Expedia share?
Citadel and Expedia share 16 LeetCode interview questions. 85 problems appear only in Citadel's list and 48 appear only in Expedia's list.
What topics overlap most between Citadel and Expedia?
The most common shared topics between Citadel and Expedia are Array (10 shared questions), Hash Table (5 shared questions), Dynamic Programming (4 shared questions), Sorting (3 shared questions), String (3 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Citadel or Expedia?
Citadel has 5 Easy, 60 Medium, and 36 Hard questions. Expedia has 13 Easy, 42 Medium, and 9 Hard questions. Citadel has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Citadel and Expedia?
Start with the 16 shared problems since they cover what both companies ask most often. Then add 20 Citadel-specific and 20 Expedia-specific questions to round out your prep.