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Interview question tracker

Citadel Coding Interview Questions — All time

Practice 96 coding questions from Citadel company-tagged LeetCode lists across all available reporting periods. Explore reported interview questions and track your progress.

Company-wide data from Fahad7177-jeh/leetcode-company-wise-questions; see its AGPL-3.0 license. All-time questions also use dataengineervishal/leetcode-companywise-questions (MIT license).

Reporting periods reflect source data, not verified interview dates. Questions can recur; inclusion does not guarantee they will appear in your interview.

Updated weekly · Latest source check: 15 Oct 2026ⓘLatest successful check of the sources used by this company. A check does not necessarily mean the questions changed.

One question at a time.

Top questions 96

Done	Question	LeetCode
Mark Palindromic Substrings completed	Palindromic Substrings	Solve
Mark Sliding Window Maximum completed	Sliding Window Maximum	Solve
Mark Best Position for a Service Centre completed	Best Position for a Service Centre	Solve
Mark Best Time to Buy and Sell Stock completed	Best Time to Buy and Sell Stock	Solve
Mark Count Palindromic Subsequences completed	Count Palindromic Subsequences	Solve
Mark Evaluate Division completed	Evaluate Division	Solve
Mark First Completely Painted Row or Column completed	First Completely Painted Row or Column	Solve
Mark Maximum Length of Repeated Subarray completed	Maximum Length of Repeated Subarray	Solve
Mark Maximum Total Damage With Spell Casting completed	Maximum Total Damage With Spell Casting	Solve
Mark Merge Intervals completed	Merge Intervals	Solve
Mark Minimum Costs Using the Train Line completed	Minimum Costs Using the Train Line	Solve
Mark Minimum Equal Sum of Two Arrays After Replacing Zeros completed	Minimum Equal Sum of Two Arrays After Replacing Zeros	Solve
Mark Minimum Operations to Make Numbers Non-positive completed	Minimum Operations to Make Numbers Non-positive	Solve
Mark Design Circular Queue completed	Design Circular Queue	Solve
Mark Employee Free Time completed	Employee Free Time	Solve
Mark Find Median from Data Stream completed	Find Median from Data Stream	Solve
Mark Find the Duplicate Number completed	Find the Duplicate Number	Solve
Mark Group Anagrams completed	Group Anagrams	Solve
Mark Length of Longest Subarray With at Most K Frequency completed	Length of Longest Subarray With at Most K Frequency	Solve
Mark LFU Cache completed	LFU Cache	Solve
Mark Longest String Chain completed	Longest String Chain	Solve
Mark LRU Cache completed	LRU Cache	Solve
Mark Meeting Scheduler completed	Meeting Scheduler	Solve
Mark Minimum Knight Moves completed	Minimum Knight Moves	Solve
Mark Number of Islands completed	Number of Islands	Solve
Mark Parallel Courses III completed	Parallel Courses III	Solve
Mark Serialize and Deserialize Binary Tree completed	Serialize and Deserialize Binary Tree	Solve
Mark Sudoku Solver completed	Sudoku Solver	Solve
Mark Binary Tree Zigzag Level Order Traversal completed	Binary Tree Zigzag Level Order Traversal	Solve
Mark Couples Holding Hands completed	Couples Holding Hands	Solve
Mark Delete and Earn completed	Delete and Earn	Solve
Mark Evaluate Reverse Polish Notation completed	Evaluate Reverse Polish Notation	Solve
Mark Find Servers That Handled Most Number of Requests completed	Find Servers That Handled Most Number of Requests	Solve
Mark Fizz Buzz completed	Fizz Buzz	Solve
Mark Insert Delete GetRandom O(1) completed	Insert Delete GetRandom O(1)	Solve
Mark Merge k Sorted Lists completed	Merge k Sorted Lists	Solve
Mark Number of Orders in the Backlog completed	Number of Orders in the Backlog	Solve
Mark Permutations completed	Permutations	Solve
Mark Reconstruct Itinerary completed	Reconstruct Itinerary	Solve
Mark Search Suggestions System completed	Search Suggestions System	Solve
Mark Smallest Missing Non-negative Integer After Operations completed	Smallest Missing Non-negative Integer After Operations	Solve
Mark Sqrt(x) completed	Sqrt(x)	Solve
Mark Trapping Rain Water completed	Trapping Rain Water	Solve
Mark Best Time to Buy and Sell Stock III completed	Best Time to Buy and Sell Stock III	Solve
Mark Binary Tree Maximum Path Sum completed	Binary Tree Maximum Path Sum	Solve
Mark Climbing Stairs completed	Climbing Stairs	Solve
Mark Combination Sum completed	Combination Sum	Solve
Mark Count Primes completed	Count Primes	Solve
Mark Course Schedule completed	Course Schedule	Solve
Mark Course Schedule II completed	Course Schedule II	Solve
Mark Design Excel Sum Formula completed	Design Excel Sum Formula	Solve
Mark Design Front Middle Back Queue completed	Design Front Middle Back Queue	Solve
Mark Find First and Last Position of Element in Sorted Array completed	Find First and Last Position of Element in Sorted Array	Solve
Mark Implement Trie (Prefix Tree) completed	Implement Trie (Prefix Tree)	Solve
Mark Koko Eating Bananas completed	Koko Eating Bananas	Solve
Mark Longest Non-decreasing Subarray From Two Arrays completed	Longest Non-decreasing Subarray From Two Arrays	Solve
Mark Max Consecutive Ones III completed	Max Consecutive Ones III	Solve
Mark Maximal Square completed	Maximal Square	Solve
Mark Meeting Rooms II completed	Meeting Rooms II	Solve
Mark Moving Average from Data Stream completed	Moving Average from Data Stream	Solve
Mark Paint House completed	Paint House	Solve
Mark Reorganize String completed	Reorganize String	Solve
Mark Sort Items by Groups Respecting Dependencies completed	Sort Items by Groups Respecting Dependencies	Solve
Mark Word Ladder II completed	Word Ladder II	Solve
Mark Alien Dictionary completed	Alien Dictionary	Solve
Mark Asteroid Collision completed	Asteroid Collision	Solve
Mark Best Time to Buy and Sell Stock II completed	Best Time to Buy and Sell Stock II	Solve
Mark Best Time to Buy and Sell Stock with Transaction Fee completed	Best Time to Buy and Sell Stock with Transaction Fee	Solve
Mark Consecutive Numbers Sum completed	Consecutive Numbers Sum	Solve
Mark Count Number of Maximum Bitwise-OR Subsets completed	Count Number of Maximum Bitwise-OR Subsets	Solve
Mark Design In-Memory File System completed	Design In-Memory File System	Solve
Mark Design Search Autocomplete System completed	Design Search Autocomplete System	Solve
Mark Egg Drop With 2 Eggs and N Floors completed	Egg Drop With 2 Eggs and N Floors	Solve
Mark Integer Break completed	Integer Break	Solve
Mark Integer to Roman completed	Integer to Roman	Solve
Mark Letter Combinations of a Phone Number completed	Letter Combinations of a Phone Number	Solve
Mark Longest Common Subsequence completed	Longest Common Subsequence	Solve
Mark Longest Increasing Path in a Matrix completed	Longest Increasing Path in a Matrix	Solve
Mark Longest Increasing Subsequence completed	Longest Increasing Subsequence	Solve
Mark Longest Palindromic Substring completed	Longest Palindromic Substring	Solve
Mark Max Points on a Line completed	Max Points on a Line	Solve
Mark Maximum Profit in Job Scheduling completed	Maximum Profit in Job Scheduling	Solve
Mark Next Permutation completed	Next Permutation	Solve
Mark Number of Dice Rolls With Target Sum completed	Number of Dice Rolls With Target Sum	Solve
Mark Pairs of Songs With Total Durations Divisible by 60 completed	Pairs of Songs With Total Durations Divisible by 60	Solve
Mark Perfect Squares completed	Perfect Squares	Solve
Mark Pow(x, n) completed	Pow(x, n)	Solve
Mark Rank Transform of a Matrix completed	Rank Transform of a Matrix	Solve
Mark Regular Expression Matching completed	Regular Expression Matching	Solve
Mark Reverse Words in a String completed	Reverse Words in a String	Solve
Mark Search a 2D Matrix II completed	Search a 2D Matrix II	Solve
Mark Simplify Path completed	Simplify Path	Solve
Mark The Skyline Problem completed	The Skyline Problem	Solve
Mark Validate Binary Search Tree completed	Validate Binary Search Tree	Solve
Mark Word Ladder completed	Word Ladder	Solve
Mark Word Search completed	Word Search	Solve