Company: Citadel
- Alien Dictionary
- Asteroid Collision
- Best Position for a Service Centre
- Best Time to Buy and Sell Stock II
- Best Time to Buy and Sell Stock III
- Best Time to Buy and Sell Stock IV
- Best Time to Buy and Sell Stock
- Binary Tree Maximum Path Sum
- Binary Tree Zigzag Level Order Traversal
- Climbing Stairs
- Combination Sum
- Container With Most Water
- Count Number of Maximum Bitwise-OR Subsets
- Count Palindromic Subsequences
- Count Ways To Build Good Strings
- Couples Holding Hands
- Delete and Earn
- Design Circular Queue
- Design Excel Sum Formula
- Design Front Middle Back Queue
- Design Search Autocomplete System
- Employee Free Time
- Evaluate Division
- Evaluate Reverse Polish Notation
- Find Median from Data Stream
- Find the Duplicate Number
- First Completely Painted Row or Column
- Fizz Buzz
- Group Anagrams
- House Robber
- Implement Trie (Prefix Tree)
- Insert Delete GetRandom O(1)
- Integer to Roman
- Knight Probability in Chessboard
- Koko Eating Bananas
- Length of Longest Subarray With at Most K Frequency
- Letter Combinations of a Phone Number
- LFU Cache
- Longest Common Subsequence
- Longest Increasing Path in a Matrix
- Longest Increasing Subsequence
- Longest Non-decreasing Subarray From Two Arrays
- Longest String Chain
- LRU Cache
- Maximal Square
- Maximum Length of Repeated Subarray
- Maximum Total Damage With Spell Casting
- Meeting Scheduler
- Merge Intervals
- Merge k Sorted Lists
- Minimum Costs Using the Train Line
- Minimum Equal Sum of Two Arrays After Replacing Zeros
- Minimum Height Trees
- Minimum Knight Moves
- Minimum Operations to Make Numbers Non-positive
- Moving Average from Data Stream
- N-Queens
- Number of Good Binary Strings
- Number of Islands
- Paint House
- Palindromic Substrings
- Parallel Courses III
- Perfect Squares
- Permutations
- Populating Next Right Pointers in Each Node II
- Populating Next Right Pointers in Each Node
- Pow(x, n)
- Rank Transform of a Matrix
- Regular Expression Matching
- Robot Room Cleaner
- Rotate Image
- Rotting Oranges
- Search Suggestions System
- Serialize and Deserialize Binary Tree
- Sliding Window Maximum
- Sort Items by Groups Respecting Dependencies
- Subarray Sums Divisible by K
- Sudoku Solver
- Transform to Chessboard
- Trapping Rain Water
- Validate Binary Search Tree
- Word Ladder II
- Word Search