All Citadel Coding Interview Questions
75 questions we track for Citadel, most frequently asked first. Practice any of them in the code editor and get AI feedback on your solution.
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- Junior7% (5)
- Mid/Senior64% (48)
- Staff29% (22)
Questions
- Two Sum129 companiesJunior
- Longest Palindromic Substring76 companiesMid/Senior
- Regular Expression Matching27 companiesStaff
- Integer to Roman32 companiesMid/Senior
- Letter Combinations of a Phone Number40 companiesMid/Senior
- Merge k Sorted Lists53 companiesStaff
- Next Permutation31 companiesMid/Senior
- Find First and Last Position of Element in Sorted Array31 companiesMid/Senior
- Sudoku Solver18 companiesStaff
- Combination Sum30 companiesMid/Senior
- Trapping Rain Water78 companiesStaff
- Permutations26 companiesMid/Senior
- Group Anagrams91 companiesMid/Senior
- Pow(x, n)23 companiesMid/Senior
- Maximum Subarray66 companiesMid/Senior
- Merge Intervals109 companiesMid/Senior
- Sqrt(x)19 companiesJunior
- Climbing Stairs38 companiesJunior
- Simplify Path25 companiesMid/Senior
- Word Search40 companiesMid/Senior
- Validate Binary Search Tree20 companiesMid/Senior
- Binary Tree Zigzag Level Order Traversal19 companiesMid/Senior
- Best Time to Buy and Sell Stock90 companiesJunior
- Best Time to Buy and Sell Stock III14 companiesStaff
- Binary Tree Maximum Path Sum23 companiesStaff
- Word Ladder II16 companiesStaff
- Word Ladder40 companiesStaff
- Max Points on a Line16 companiesStaff
- Evaluate Reverse Polish Notation18 companiesMid/Senior
- Reverse Words in a String29 companiesMid/Senior
- Best Time to Buy and Sell Stock IV11 companiesStaff
- Number of Islands81 companiesMid/Senior
- Count Primes17 companiesMid/Senior
- Course Schedule41 companiesMid/Senior
- Course Schedule II35 companiesMid/Senior
- Maximal Square28 companiesMid/Senior
- Sliding Window Maximum46 companiesStaff
- Meeting Rooms II43 companiesMid/Senior
- Paint House8 companiesMid/Senior
- Perfect Squares11 companiesMid/Senior
- Find the Duplicate Number22 companiesMid/Senior
- Longest Increasing Subsequence31 companiesMid/Senior
- Reconstruct Itinerary22 companiesStaff
- Integer Break7 companiesMid/Senior
- Evaluate Division23 companiesMid/Senior
- Fizz Buzz19 companiesJunior
- Optimal Account Balancing11 companiesStaff
- Palindromic Substrings25 companiesMid/Senior
- Knight Probability in Chessboard6 companiesMid/Senior
- Best Time to Buy and Sell Stock with Transaction Fee8 companiesMid/Senior
- Maximum Length of Repeated Subarray7 companiesMid/Senior
- Employee Free Time13 companiesStaff
- Couples Holding Hands5 companiesStaff
- Reorganize String21 companiesMid/Senior
- Transform to Chessboard2 companiesStaff
- Koko Eating Bananas38 companiesMid/Senior
- Max Consecutive Ones III19 companiesMid/Senior
- Pairs of Songs With Total Durations Divisible by 608 companiesMid/Senior
- Longest String Chain16 companiesMid/Senior
- Number of Dice Rolls With Target Sum5 companiesMid/Senior
- Minimum Knight Moves12 companiesMid/Senior
- Sort Items by Groups Respecting Dependencies5 companiesStaff
- Meeting Scheduler8 companiesMid/Senior
- Search Suggestions System21 companiesMid/Senior
- Best Position for a Service Centre1 companyStaff
- Find Servers That Handled Most Number of Requests6 companiesStaff
- Rank Transform of a Matrix3 companiesStaff
- Number of Orders in the Backlog4 companiesMid/Senior
- Count Number of Maximum Bitwise-OR Subsets7 companiesMid/Senior
- Parallel Courses III9 companiesStaff
- Count Palindromic Subsequences12 companiesStaff
- Smallest Missing Non-negative Integer After Operations6 companiesMid/Senior
- First Completely Painted Row or Column5 companiesMid/Senior
- Length of Longest Subarray With at Most K Frequency4 companiesMid/Senior
- Maximum Total Damage With Spell Casting7 companiesMid/Senior