CitadelLeetCode Questions
VerifiedCommunity-reported coding interview questions for Citadel, organized by frequency across 30-day, 3-month, and 6-month recency windows.
# | Problem | Difficulty | Frequency↓ | Acceptance | |
|---|---|---|---|---|---|
| #239 | Sliding Window Maximum3 sources | Hard | 100% | 49.0% | |
| #2484 | Count Palindromic Subsequences3 sources | Hard | 100% | 41.5% | |
| #647 | Palindromic Substrings3 sources | Medium | 100% | 73.0% | |
| #1801 | Number of Orders in the Backlog3 sources | Medium | 99% | 54.1% | |
| #121 | Best Time to Buy and Sell Stock3 sources | Easy | 90% | 57.0% | |
| #295 | Find Median from Data Stream3 sources | Hard | 89% | 54.7% | |
| #1515 | Best Position for a Service Centre3 sources | Hard | 89% | 35.4% | |
| #56 | Merge Intervals3 sources | Medium | 89% | 52.3% | |
| #2361 | Minimum Costs Using the Train Line3 sources | Hard | 88% | 77.9% | |
| #3186 | Medium | 88% | 45.1% | ||
| #2661 | Medium | 88% | 63.9% | ||
| #718 | Maximum Length of Repeated Subarray3 sources | Medium | 88% | 51.5% | |
| #146 | LRU Cache3 sources | Medium | 88% | 47.6% | |
| #2702 | Hard | 88% | 44.2% | ||
| #380 | Insert Delete GetRandom O(1)3 sources | Medium | 87% | 55.4% | |
| #981 | Time Based Key-Value Store3 sources | Medium | 84% | 50.0% | |
| #399 | Evaluate Division3 sources | Medium | 81% | 64.4% | |
| #4069 | Medium | 81% | 0.6% | ||
| #150 | Evaluate Reverse Polish Notation3 sources | Medium | 78% | 58.2% | |
| #2050 | Parallel Courses III3 sources | Hard | 77% | 66.8% | |
| #460 | LFU Cache3 sources | Hard | 75% | 49.7% | |
| #759 | Employee Free Time3 sources | Hard | 75% | 73.0% | |
| #1229 | Meeting Scheduler3 sources | Medium | 75% | 55.2% | |
| #287 | Find the Duplicate Number3 sources | Medium | 75% | 64.6% | |
| #2958 | Medium | 75% | 56.7% | ||
| #3484 | Design Spreadsheet3 sources | Medium | 74% | 73.9% | |
| #210 | Course Schedule II3 sources | Medium | 69% | 55.9% | |
| #1606 | Hard | 69% | 45.6% | ||
| #2598 | Medium | 69% | 55.9% | ||
| #69 | Sqrt(x)3 sources | Easy | 68% | 42.1% | |
| #297 | Hard | 68% | 61.1% | ||
| #622 | Design Circular Queue3 sources | Medium | 68% | 55.0% | |
| #412 | Fizz Buzz3 sources | Easy | 68% | 75.7% | |
| #124 | Binary Tree Maximum Path Sum3 sources | Hard | 64% | 42.5% | |
| #200 | Number of Islands3 sources | Medium | 64% | 64.7% | |
| #332 | Reconstruct Itinerary3 sources | Hard | 64% | 44.7% | |
| #1004 | Max Consecutive Ones III3 sources | Medium | 64% | 68.0% | |
| #127 | Word Ladder3 sources | Hard | 64% | 46.0% | |
| #465 | Optimal Account Balancing3 sources | Hard | 64% | 50.5% | |
| #348 | Design Tic-Tac-Toe3 sources | Medium | 64% | 58.8% | |
| #1 | Two Sum3 sources | Easy | 64% | 57.8% | |
| #23 | Merge k Sorted Lists3 sources | Hard | 63% | 60.0% | |
| #765 | Couples Holding Hands3 sources | Hard | 63% | 59.5% | |
| #631 | Design Excel Sum Formula2 sources | Hard | 63% | 39.6% | |
| #37 | Sudoku Solver3 sources | Hard | 63% | 65.6% | |
| #49 | Group Anagrams2 sources | Medium | 63% | 72.9% | |
| #1268 | Search Suggestions System3 sources | Medium | 57% | 65.2% | |
| #256 | Paint House3 sources | Medium | 57% | 64.5% | |
| #1632 | Rank Transform of a Matrix3 sources | Hard | 57% | 42.4% | |
| #103 | Medium | 57% | 64.1% |
Citadel Technical Interview Overview & Company-Wise Questions
This page organizes 92 community-reported Citadel LeetCode problems by difficulty, frequency, and recency so you can build a focused preparation queue. Reports are aggregated from public datasets and should be treated as preparation signals rather than predictions.
How to prioritize Citadel preparation
Start with the 4 questions reported in the last 30 days, then work through the highest-frequency topics (Array, Dynamic Programming, Hash Table, String). This page tracks 92 community-reported questions across 6 Easy, 56 Medium, and 30 Hard problems. Data refreshed Oct 28, 2026.
Frequently Asked Questions
What are the most frequent LeetCode questions for Citadel?
The leading problems in the available Citadel interview reports include Sliding Window Maximum, Count Palindromic Subsequences, Palindromic Substrings. This page tracks 92 reported problems across Easy (6), Medium (56), and Hard (30) difficulty levels.
Where can I practice company-wise LeetCode questions for Citadel?
You can review all 92 Citadel questions on this page, filter them by 30-day, 3-month, 6-month, and all-time windows, and save practice progress for free.
How does LeetMap Pro organize Citadel interview problem recency?
LeetMap Pro groups community-reported occurrences into 30-day, 3-month, 6-month, and older windows. These are preparation signals from the available sources, not guarantees that a problem will appear in a future interview.
What is the difficulty distribution for Citadel coding questions?
Medium is the largest tracked difficulty group for Citadel, with 56 problems. The full distribution is 6 Easy, 56 Medium, and 30 Hard.