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Citadel interview questions and practice
73 coding questions are known to come up in Citadel interviews (5 easy, 45 medium, 23 hard), 5 of them in the last six months. The most common topics are Array, Dynamic Programming, Hash Table, String.
Practice interviews built from public job posts and question lists. Each open post links to the original so you can apply on Citadel’s own site; Citadel does not run, see or review your practice.
Coding questions Citadel asks
From public company-tagged interview question lists. Most recent and most frequent first.
- Array40
- Dynamic Programming18
- Hash Table17
- String16
- Breadth-First Search12
- Math12
- Depth-First Search11
- Design10
- Graph9
- Binary Search9
- Two Pointers7
- Sorting7
| Question | Difficulty | Asked recently |
|---|---|---|
| Find Median from Data Stream | Hard | Yes |
| Number of Orders in the Backlog | Medium | Yes |
| Parallel Courses III | Hard | Yes |
| Time Based Key-Value Store | Medium | Yes |
| Word Ladder | Hard | Yes |
| Sliding Window Maximum | Hard | No |
| Count Palindromic Subsequences | Hard | No |
| Palindromic Substrings | Medium | No |
| Best Time to Buy and Sell Stock | Easy | No |
| Best Position for a Service Centre | Hard | No |
| Merge Intervals | Medium | No |
| Maximum Total Damage With Spell Casting | Medium | No |
| LRU Cache | Medium | No |
| First Completely Painted Row or Column | Medium | No |
| Maximum Length of Repeated Subarray | Medium | No |
| Evaluate Division | Medium | No |
| Insert Delete GetRandom O(1) | Medium | No |
| LFU Cache | Hard | No |
| Find the Duplicate Number | Medium | No |
| Smallest Missing Non-negative Integer After Operations | Medium | No |
| Find Servers That Handled Most Number of Requests | Hard | No |
| Design Circular Queue | Medium | No |
| Fizz Buzz | Easy | No |
| Serialize and Deserialize Binary Tree | Hard | No |
| Sqrt(x) | Easy | No |
Questions about Citadel interviews
What topics do Citadel interviews cover?
The ones that come up most are Array, Dynamic Programming, Hash Table, String, Breadth-First Search.
What coding questions does Citadel ask?
73 questions are tagged to Citadel in public interview lists: 5 easy, 45 medium and 23 hard. The most asked include Find Median from Data Stream, Number of Orders in the Backlog, Parallel Courses III.
How do I practise a Citadel interview?
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