Citadel LeetCode Interview Questions
Practice 87 coding problems currently tagged to Citadel. Use the frequency and topic signals to build a focused software engineering interview practice plan.
Last updated:
Top Topics at Citadel
Ace your Citadel interview with AI
Get real-time AI assistance during your actual interview. Invisible to screensharing.
Citadel LeetCode Interview Questions
| Problem | DifficultyDiff | Action |
|---|---|---|
Sliding Window Maximum 100% | HardH | Solve→ |
Count Palindromic Subsequences 98.6% | HardH | Solve→ |
Palindromic Substrings 93.8% | MediumM | Solve→ |
Best Time to Buy and Sell Stock 89.9% | EasyE | Solve→ |
Find Median from Data Stream 87.8% | HardH | Solve→ |
Best Position for a Service Centre 87.8% | HardH | Solve→ |
Merge Intervals 87.8% | MediumM | Solve→ |
Number of Orders in the Backlog 85.4% | MediumM | Solve→ |
LRU Cache 82.8% | MediumM | Solve→ |
Maximum Total Damage With Spell Casting 82.8% | MediumM | Solve→ |
Minimum Costs Using the Train Line 82.8% | HardH | Solve→ |
Minimum Operations to Make Numbers Non-positive 82.8% | HardH | Solve→ |
Evaluate Division 79.9% | MediumM | Solve→ |
First Completely Painted Row or Column 79.9% | MediumM | Solve→ |
Maximum Length of Repeated Subarray 79.9% | MediumM | Solve→ |
Insert Delete GetRandom O(1) 76.5% | MediumM | Solve→ |
Parallel Courses III 76.5% | HardH | Solve→ |
Find the Duplicate Number 72.7% | MediumM | Solve→ |
LFU Cache 72.7% | HardH | Solve→ |
Employee Free Time 72.7% | HardH | Solve→ |
Meeting Scheduler 72.7% | MediumM | Solve→ |
Time Based Key-Value Store 72.7% | MediumM | Solve→ |
Serialize and Deserialize Binary Tree 68.2% | HardH | Solve→ |
Design Circular Queue 68.2% | MediumM | Solve→ |
Fizz Buzz 68.2% | EasyE | Solve→ |
Pass your interview with AI assistance
Get real-time solutions during your actual coding interview. Invisible to screensharing.
Sqrt(x) 68.2% | EasyE | Solve→ |
Find Servers That Handled Most Number of Requests 68.2% | HardH | Solve→ |
Smallest Missing Non-negative Integer After Operations 68.2% | MediumM | Solve→ |
Merge k Sorted Lists 62.7% | HardH | Solve→ |
Binary Tree Maximum Path Sum 62.7% | HardH | Solve→ |
Evaluate Reverse Polish Notation 62.7% | MediumM | Solve→ |
Number of Islands 62.7% | MediumM | Solve→ |
Length of Longest Subarray With at Most K Frequency 62.7% | MediumM | Solve→ |
Couples Holding Hands 62.7% | HardH | Solve→ |
Design Excel Sum Formula 62.7% | HardH | Solve→ |
Course Schedule II 62.7% | MediumM | Solve→ |
Reconstruct Itinerary 62.7% | HardH | Solve→ |
Max Consecutive Ones III 62.7% | MediumM | Solve→ |
Word Ladder 62.7% | HardH | Solve→ |
Design Tic-Tac-Toe 62.7% | MediumM | Solve→ |
Design Spreadsheet 62.7% | MediumM | Solve→ |
Sudoku Solver 55.6% | HardH | Solve→ |
Search Suggestions System 55.6% | MediumM | Solve→ |
Group Anagrams 55.6% | MediumM | Solve→ |
Implement Trie (Prefix Tree) 55.6% | MediumM | Solve→ |
Sort Items by Groups Respecting Dependencies 55.6% | HardH | Solve→ |
Moving Average from Data Stream 55.6% | EasyE | Solve→ |
Paint House 55.6% | MediumM | Solve→ |
Rank Transform of a Matrix 55.6% | HardH | Solve→ |
Binary Tree Zigzag Level Order Traversal 55.6% | MediumM | Solve→ |
Pass your interview with AI assistance
Get real-time solutions during your actual coding interview. Invisible to screensharing.
Count Primes 55.6% | MediumM | Solve→ |
Meeting Rooms II 55.6% | MediumM | Solve→ |
Optimal Account Balancing 55.6% | HardH | Solve→ |
Trapping Rain Water 55.6% | HardH | Solve→ |
Combination Sum 45.7% | MediumM | Solve→ |
Permutations 45.7% | MediumM | Solve→ |
Best Time to Buy and Sell Stock III 45.7% | HardH | Solve→ |
Course Schedule 45.7% | MediumM | Solve→ |
Perfect Squares 45.7% | MediumM | Solve→ |
Word Search 45.7% | MediumM | Solve→ |
Design Front Middle Back Queue 45.7% | MediumM | Solve→ |
Reorganize String 45.7% | MediumM | Solve→ |
Count Number of Maximum Bitwise-OR Subsets 45.7% | MediumM | Solve→ |
Word Ladder II 45.7% | HardH | Solve→ |
Letter Combinations of a Phone Number 45.7% | MediumM | Solve→ |
Climbing Stairs 45.7% | EasyE | Solve→ |
Pow(x, n) 45.7% | MediumM | Solve→ |
Koko Eating Bananas 45.7% | MediumM | Solve→ |
Max Points on a Line 45.7% | HardH | Solve→ |
Longest Palindromic Substring 45.7% | MediumM | Solve→ |
Find First and Last Position of Element in Sorted Array 45.7% | MediumM | Solve→ |
Next Permutation 45.7% | MediumM | Solve→ |
Validate Binary Search Tree 45.7% | MediumM | Solve→ |
Number of Dice Rolls With Target Sum 45.7% | MediumM | Solve→ |
Best Time to Buy and Sell Stock IV 45.7% | HardH | Solve→ |
Pass your interview with AI assistance
Get real-time solutions during your actual coding interview. Invisible to screensharing.
Min Stack 45.7% | MediumM | Solve→ |
Maximum Subarray 45.7% | MediumM | Solve→ |
Two Sum 45.7% | EasyE | Solve→ |
Transform to Chessboard 45.7% | HardH | Solve→ |
Design A Leaderboard 45.7% | MediumM | Solve→ |
Design In-Memory File System 45.7% | HardH | Solve→ |
Best Time to Buy and Sell Stock with Transaction Fee 45.7% | MediumM | Solve→ |
Knight Probability in Chessboard 45.7% | MediumM | Solve→ |
String to Integer (atoi) 45.7% | MediumM | Solve→ |
Number of Ways to Paint N × 3 Grid 45.7% | HardH | Solve→ |
Find Eventual Safe States 45.7% | MediumM | Solve→ |
Design Search Autocomplete System 45.7% | HardH | Solve→ |
Similar Companies
Explore company practice sets with a similar number of tagged coding questions.
Frequently Asked Questions
What LeetCode problems are tagged to Citadel?
Our current Citadel practice dataset contains 87 tagged coding problems, including Sliding Window Maximum, Count Palindromic Subsequences, Palindromic Substrings. The difficulty breakdown is 6 Easy, 51 Medium, and 30 Hard problems.
How should I prepare for a Citadel coding interview?
Focus on the most frequently asked problems first, especially those with high frequency scores. Citadel interviews typically emphasize Array and Hash Table. Practice explaining your thought process while coding.
What is the difficulty level of Citadel coding interviews?
Based on our data, Citadel interviews include 6 Easy (7%), 51 Medium (59%), and 30 Hard (34%) problems.
Ready to ace your Citadel interview?
Join thousands of engineers who landed offers at top tech companies.
Get Started FreeNo credit card required