Where can I find company-wise LeetCode questions for Citadel?

LeetMap Pro provides a complete, verified list of 90 company-wise Citadel coding interview questions filtered by 30-day, 3-month, and 6-month recency windows, 100% free with no paywall or subscription.

How does LeetMap track Citadel interview problem recency?

LeetMap weights problem occurrences across 30-day, 3-month, and 6-month recency windows to ensure candidates focus on problems actively being asked in the current hiring cycle.

What difficulty distribution should I expect in Citadel coding rounds?

For Citadel, Medium difficulty problems represent the largest share (54 problems), followed by Easy (6) and Hard (30). Mastering foundational patterns like Trees, Graphs, and Dynamic Programming is essential.

CitadelLeetCode Questions

Verified

90 questions·6 Easy·54 Medium·30 Hard

Company-wise coding interview questions asked by Citadel, ranked by real frequency across 30-day, 3-month, and 6-month recency windows.

⌘K

#239Sliding Window Maximum

Hard·Freq 100%·Acc 49.0%

#2484Count Palindromic Subsequences

Hard·Freq 100%·Acc 41.5%

#647Palindromic Substrings

Medium·Freq 100%·Acc 73.0%

#121Best Time to Buy and Sell Stock

Easy·Freq 90%·Acc 57.0%

#295Find Median from Data Stream

Hard·Freq 88%·Acc 54.7%

#1515Best Position for a Service Centre

Hard·Freq 88%·Acc 35.4%

#56Merge Intervals

Medium·Freq 88%·Acc 52.3%

#1801Number of Orders in the Backlog

Medium·Freq 88%·Acc 54.1%

#146LRU Cache

Medium·Freq 88%·Acc 47.6%

#3186Maximum Total Damage With Spell Casting

Medium·Freq 88%·Acc 45.1%

#2361Minimum Costs Using the Train Line

Hard·Freq 88%·Acc 77.9%

#2702Minimum Operations to Make Numbers Non-positive

Hard·Freq 88%·Acc 44.2%

#2661First Completely Painted Row or Column

Medium·Freq 88%·Acc 63.9%

#718Maximum Length of Repeated Subarray

Medium·Freq 88%·Acc 51.5%

#399Evaluate Division

Medium·Freq 80%·Acc 64.4%

#380Insert Delete GetRandom O(1)

Medium·Freq 77%·Acc 55.4%

#2050Parallel Courses III

Hard·Freq 77%·Acc 66.8%

#287Find the Duplicate Number

Medium·Freq 75%·Acc 64.6%

#460LFU Cache

Hard·Freq 75%·Acc 49.7%

#759Employee Free Time

Hard·Freq 75%·Acc 73.0%

#1229Meeting Scheduler

Medium·Freq 75%·Acc 55.2%

#2958Length of Longest Subarray With at Most K Frequency

Medium·Freq 75%·Acc 56.7%

#981Time Based Key-Value Store

Medium·Freq 73%·Acc 50.0%

#297Serialize and Deserialize Binary Tree

Hard·Freq 68%·Acc 61.1%

#622Design Circular Queue

Medium·Freq 68%·Acc 55.0%

#412Fizz Buzz

Easy·Freq 68%·Acc 75.7%

#69Sqrt(x)

Easy·Freq 68%·Acc 42.1%

#1606Find Servers That Handled Most Number of Requests

Hard·Freq 68%·Acc 45.6%

#2598Smallest Missing Non-negative Integer After Operations

Medium·Freq 68%·Acc 55.9%

#23Merge k Sorted Lists

Hard·Freq 63%·Acc 60.0%

#124Binary Tree Maximum Path Sum

Hard·Freq 63%·Acc 42.5%

#150Evaluate Reverse Polish Notation

Medium·Freq 63%·Acc 58.2%

#200Number of Islands

Medium·Freq 63%·Acc 64.7%

#765Couples Holding Hands

Hard·Freq 63%·Acc 59.5%

#631Design Excel Sum Formula

Hard·Freq 63%·Acc 39.6%

#210Course Schedule II

Medium·Freq 63%·Acc 55.9%

#332Reconstruct Itinerary

Hard·Freq 63%·Acc 44.7%

#1004Max Consecutive Ones III

Medium·Freq 63%·Acc 68.0%

#127Word Ladder

Hard·Freq 63%·Acc 46.0%

#348Design Tic-Tac-Toe

Medium·Freq 63%·Acc 58.8%

#3484Design Spreadsheet

Medium·Freq 63%·Acc 73.9%

#37Sudoku Solver

Hard·Freq 63%·Acc 65.6%

#49Group Anagrams

Medium·Freq 63%·Acc 72.9%

#1268Search Suggestions System

Medium·Freq 56%·Acc 65.2%

#208Implement Trie (Prefix Tree)

Medium·Freq 56%·Acc 69.7%

#1203Sort Items by Groups Respecting Dependencies

Hard·Freq 56%·Acc 66.0%

#346Moving Average from Data Stream

Easy·Freq 56%·Acc 80.2%

#256Paint House

Medium·Freq 56%·Acc 64.5%

#1632Rank Transform of a Matrix

Hard·Freq 56%·Acc 42.4%

#103Binary Tree Zigzag Level Order Traversal

Medium·Freq 56%·Acc 64.1%

#204Count Primes

Medium·Freq 56%·Acc 36.2%

#253Meeting Rooms II

Medium·Freq 56%·Acc 52.7%

#465Optimal Account Balancing

Hard·Freq 56%·Acc 50.5%

#42Trapping Rain Water

Hard·Freq 56%·Acc 67.7%

#39Combination Sum

Medium·Freq 50%·Acc 76.8%

#46Permutations

Medium·Freq 50%·Acc 82.1%

#123Best Time to Buy and Sell Stock III

Hard·Freq 50%·Acc 54.2%

#207Course Schedule

Medium·Freq 50%·Acc 51.8%

#279Perfect Squares

Medium·Freq 50%·Acc 56.7%

#79Word Search

Medium·Freq 50%·Acc 47.7%

#1670Design Front Middle Back Queue

Medium·Freq 50%·Acc 58.3%

#767Reorganize String

Medium·Freq 50%·Acc 57.3%

#2044Count Number of Maximum Bitwise-OR Subsets

Medium·Freq 50%·Acc 89.5%

#126Word Ladder II

Hard·Freq 50%·Acc 27.8%

#17Letter Combinations of a Phone Number

Medium·Freq 50%·Acc 66.4%

#70Climbing Stairs

Easy·Freq 50%·Acc 54.2%

#50Pow(x, n)

Medium·Freq 50%·Acc 38.9%

#875Koko Eating Bananas

Medium·Freq 50%·Acc 50.2%

#149Max Points on a Line

Hard·Freq 50%·Acc 31.0%

#5Longest Palindromic Substring

Medium·Freq 50%·Acc 38.2%

#34Find First and Last Position of Element in Sorted Array

Medium·Freq 50%·Acc 49.3%

#31Next Permutation

Medium·Freq 50%·Acc 45.6%

#98Validate Binary Search Tree

Medium·Freq 50%·Acc 36.0%

#1155Number of Dice Rolls With Target Sum

Medium·Freq 50%·Acc 62.5%

#188Best Time to Buy and Sell Stock IV

Hard·Freq 50%·Acc 50.7%

#155Min Stack

Medium·Freq 50%·Acc 58.4%

#53Maximum Subarray

Medium·Freq 50%·Acc 53.5%

#1Two Sum

Easy·Freq 50%·Acc 57.8%

#782Transform to Chessboard

Hard·Freq 50%·Acc 51.6%

#1244Design A Leaderboard

Medium·Freq 50%·Acc 68.1%

#588Design In-Memory File System

Hard·Freq 50%·Acc 48.3%

#714Best Time to Buy and Sell Stock with Transaction Fee

Medium·Freq 50%·Acc 72.3%

#688Knight Probability in Chessboard

Medium·Freq 50%·Acc 57.2%

#8String to Integer (atoi)

Medium·Freq 50%·Acc 21.3%

#1411Number of Ways to Paint N × 3 Grid

Hard·Freq 50%·Acc 80.5%

#802Find Eventual Safe States

Medium·Freq 50%·Acc 71.2%

#1048Longest String Chain

Medium·Freq 50%·Acc 63.3%

#221Maximal Square

Medium·Freq 50%·Acc 50.6%

#151Reverse Words in a String

Medium·Freq 50%·Acc 57.0%

#642Design Search Autocomplete System

Hard·Freq 46%·Acc 0.5%

#	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%
#121	Best Time to Buy and Sell Stock3 sources	Easy	90%	57.0%
#295	Find Median from Data Stream3 sources	Hard	88%	54.7%
#1515	Best Position for a Service Centre3 sources	Hard	88%	35.4%
#56	Merge Intervals3 sources	Medium	88%	52.3%
#1801	Number of Orders in the Backlog3 sources	Medium	88%	54.1%
#146	LRU Cache3 sources	Medium	88%	47.6%
#3186	Maximum Total Damage With Spell Casting3 sources	Medium	88%	45.1%
#2361	Minimum Costs Using the Train Line3 sources	Hard	88%	77.9%
#2702	Minimum Operations to Make Numbers Non-positive3 sources	Hard	88%	44.2%
#2661	First Completely Painted Row or Column3 sources	Medium	88%	63.9%
#718	Maximum Length of Repeated Subarray3 sources	Medium	88%	51.5%
#399	Evaluate Division3 sources	Medium	80%	64.4%
#380	Insert Delete GetRandom O(1)3 sources	Medium	77%	55.4%
#2050	Parallel Courses III3 sources	Hard	77%	66.8%
#287	Find the Duplicate Number3 sources	Medium	75%	64.6%
#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%
#2958	Length of Longest Subarray With at Most K Frequency3 sources	Medium	75%	56.7%
#981	Time Based Key-Value Store3 sources	Medium	73%	50.0%
#297	Serialize and Deserialize Binary Tree3 sources	Hard	68%	61.1%
#622	Design Circular Queue3 sources	Medium	68%	55.0%
#412	Fizz Buzz3 sources	Easy	68%	75.7%
#69	Sqrt(x)3 sources	Easy	68%	42.1%
#1606	Find Servers That Handled Most Number of Requests3 sources	Hard	68%	45.6%
#2598	Smallest Missing Non-negative Integer After Operations3 sources	Medium	68%	55.9%
#23	Merge k Sorted Lists3 sources	Hard	63%	60.0%
#124	Binary Tree Maximum Path Sum3 sources	Hard	63%	42.5%
#150	Evaluate Reverse Polish Notation3 sources	Medium	63%	58.2%
#200	Number of Islands3 sources	Medium	63%	64.7%
#765	Couples Holding Hands3 sources	Hard	63%	59.5%
#631	Design Excel Sum Formula3 sources	Hard	63%	39.6%
#210	Course Schedule II3 sources	Medium	63%	55.9%
#332	Reconstruct Itinerary3 sources	Hard	63%	44.7%
#1004	Max Consecutive Ones III3 sources	Medium	63%	68.0%
#127	Word Ladder3 sources	Hard	63%	46.0%
#348	Design Tic-Tac-Toe3 sources	Medium	63%	58.8%
#3484	Design Spreadsheet3 sources	Medium	63%	73.9%
#37	Sudoku Solver3 sources	Hard	63%	65.6%
#49	Group Anagrams3 sources	Medium	63%	72.9%
#1268	Search Suggestions System3 sources	Medium	56%	65.2%
#208	Implement Trie (Prefix Tree)3 sources	Medium	56%	69.7%
#1203	Sort Items by Groups Respecting Dependencies3 sources	Hard	56%	66.0%
#346	Moving Average from Data Stream3 sources	Easy	56%	80.2%
#256	Paint House3 sources	Medium	56%	64.5%
#1632	Rank Transform of a Matrix3 sources	Hard	56%	42.4%
#103	Binary Tree Zigzag Level Order Traversal3 sources	Medium	56%	64.1%
#204	Count Primes3 sources	Medium	56%	36.2%
#253	Meeting Rooms II3 sources	Medium	56%	52.7%
#465	Optimal Account Balancing3 sources	Hard	56%	50.5%
#42	Trapping Rain Water3 sources	Hard	56%	67.7%
#39	Combination Sum3 sources	Medium	50%	76.8%
#46	Permutations3 sources	Medium	50%	82.1%
#123	Best Time to Buy and Sell Stock III3 sources	Hard	50%	54.2%
#207	Course Schedule3 sources	Medium	50%	51.8%
#279	Perfect Squares3 sources	Medium	50%	56.7%
#79	Word Search3 sources	Medium	50%	47.7%
#1670	Design Front Middle Back Queue3 sources	Medium	50%	58.3%
#767	Reorganize String3 sources	Medium	50%	57.3%
#2044	Count Number of Maximum Bitwise-OR Subsets3 sources	Medium	50%	89.5%
#126	Word Ladder II3 sources	Hard	50%	27.8%
#17	Letter Combinations of a Phone Number3 sources	Medium	50%	66.4%
#70	Climbing Stairs3 sources	Easy	50%	54.2%
#50	Pow(x, n)3 sources	Medium	50%	38.9%
#875	Koko Eating Bananas3 sources	Medium	50%	50.2%
#149	Max Points on a Line3 sources	Hard	50%	31.0%
#5	Longest Palindromic Substring3 sources	Medium	50%	38.2%
#34	Find First and Last Position of Element in Sorted Array3 sources	Medium	50%	49.3%
#31	Next Permutation3 sources	Medium	50%	45.6%
#98	Validate Binary Search Tree3 sources	Medium	50%	36.0%
#1155	Number of Dice Rolls With Target Sum3 sources	Medium	50%	62.5%
#188	Best Time to Buy and Sell Stock IV3 sources	Hard	50%	50.7%
#155	Min Stack3 sources	Medium	50%	58.4%
#53	Maximum Subarray3 sources	Medium	50%	53.5%
#1	Two Sum3 sources	Easy	50%	57.8%
#782	Transform to Chessboard3 sources	Hard	50%	51.6%
#1244	Design A Leaderboard3 sources	Medium	50%	68.1%
#588	Design In-Memory File System3 sources	Hard	50%	48.3%
#714	Best Time to Buy and Sell Stock with Transaction Fee3 sources	Medium	50%	72.3%
#688	Knight Probability in Chessboard3 sources	Medium	50%	57.2%
#8	String to Integer (atoi)3 sources	Medium	50%	21.3%
#1411	Number of Ways to Paint N × 3 Grid3 sources	Hard	50%	80.5%
#802	Find Eventual Safe States3 sources	Medium	50%	71.2%
#1048	Longest String Chain	Medium	50%	63.3%
#221	Maximal Square	Medium	50%	50.6%
#151	Reverse Words in a String	Medium	50%	57.0%
#642	Design Search Autocomplete System2 sources	Hard	46%	0.5%

Showing 90 of 90 questionsWindow: All Time

Citadel Technical Interview Overview & Company-Wise Questions

Software engineering and technical interviews at Citadel emphasize real-world problem solving, algorithmic efficiency, and scalable data structure design. The curated dataset above contains 90 verified LeetCode problems, categorized by frequency and filtered across recent interview seasons.

Frequently Asked Questions

What are the top LeetCode questions for Citadel?

Leading questions include Sliding Window Maximum, Count Palindromic Subsequences, Palindromic Substrings. Reviewing questions with higher recency (within the last 30 to 90 days) yields the highest return on preparation time.

Where can I practice company-wise LeetCode questions for Citadel?

You can practice all 90 Citadel LeetCode questions right here on LeetMap Pro. Filter by 30-day, 3-month, and 6-month recency, track your progress with local checkpoints, and practice curated SQL problems completely free.

How should I prepare for Citadel coding rounds?

Begin by reviewing Medium-difficulty problems (54 tracked), which constitute the majority of technical rounds. Complement coding practice with foundational DSA patterns like Sliding Window, Two Pointers, and Graph Traversal.

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Recommended Patterns

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