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Citadel Master DSA Sheet

This compilation contains exclusive, previously asked data structure and algorithm questions from real Citadel interviews. Focus on these core problem patterns to confidently tackle even the hardest interview challenges.

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Course Schedule II6 Months
Word Ladder II
Design A Leaderboard3 Months
Meeting Rooms II
Find Servers That Handled Most Number of Requests
Number of Orders in the Backlog3 Months
Min Stack3 Months
Design Tic-Tac-Toe3 Months
Pow(x, n)
Trapping Rain Water
Climbing Stairs
Time Based Key-Value Store
Serialize and Deserialize Binary Tree
Next Permutation6 Months
Best Position for a Service Centre
Minimum Costs Using the Train Line
Longest Palindromic Substring
Merge Intervals
Koko Eating Bananas
Search Suggestions System
Longest String Chain
Optimal Account Balancing6 Months
Maximum Profit in Job Scheduling
Regular Expression Matching
Design Excel Sum Formula
Sqrt(x)
Parallel Courses III
Longest Non-decreasing Subarray From Two Arrays
Minimum Knight Moves
Insert Delete GetRandom O(1)
Design Circular Queue
Max Points on a Line
Combination Sum
Course Schedule
Reverse Words in a String
Maximum Total Damage With Spell Casting
Palindromic Substrings
Couples Holding Hands
LFU Cache
Permutations
Maximal Square
Word Ladder6 Months
Minimum Equal Sum of Two Arrays After Replacing Zeros
Number of Islands
Two Sum6 Months
LRU Cache6 Months
Maximum Subarray
Moving Average from Data Stream
Max Consecutive Ones III6 Months
Find the Duplicate Number
Simplify Path
Letter Combinations of a Phone Number
Design Front Middle Back Queue
Reconstruct Itinerary
Evaluate Division
Critical Connections in a Network
Word Search
Best Time to Buy and Sell Stock6 Months
Binary Tree Maximum Path Sum
Group Anagrams
Implement Trie (Prefix Tree)
Merge k Sorted Lists
Pairs of Songs With Total Durations Divisible by 60
Integer to Roman
Sudoku Solver
Reorganize String
Find Median from Data Stream3 Months
Sliding Window Maximum6 Months
Maximum Length of Repeated Subarray
Best Time to Buy and Sell Stock III
Delete and Earn
Validate Binary Search Tree6 Months
Longest Increasing Subsequence
Perfect Squares
Minimum Operations to Make Numbers Non-positive
Find First and Last Position of Element in Sorted Array
Binary Tree Zigzag Level Order Traversal
Length of Longest Subarray With at Most K Frequency
Best Time to Buy and Sell Stock IV
Fizz Buzz
Count Primes
Meeting Scheduler
Design Search Autocomplete System
Integer Break
Count Palindromic Subsequences
Paint House
Transform to Chessboard
Evaluate Reverse Polish Notation3 Months
Employee Free Time
Smallest Missing Non-negative Integer After Operations6 Months
Count Number of Maximum Bitwise-OR Subsets
Number of Dice Rolls With Target Sum
Egg Drop With 2 Eggs and N Floors
Rank Transform of a Matrix
Sort Items by Groups Respecting Dependencies
First Completely Painted Row or Column