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Citadel
Previous Year Questions
Consecutive Numbers Sum
Hard
Longest String Chain
Medium
Different Ways to Add Parentheses
Medium
Palindromic Substrings
Medium
Inorder Successor in BST
Medium
Longest Valid Parentheses
Hard
Knight Dialer
Medium
Best Time to Buy and Sell Stock
Easy
Trapping Rain Water
Hard
Best Time to Buy and Sell Stock II
Easy
Maximal Square
Medium
Valid Parentheses
Easy
Find Median from Data Stream
Hard
Design Circular Queue
Medium
Sliding Window Maximum
Hard
Search a 2D Matrix II
Medium
LRU Cache
Medium
Find Pivot Index
Easy
Reconstruct Itinerary
Medium
Best Time to Buy and Sell Stock III
Hard
Binary Tree Right Side View
Medium
Construct Binary Tree from Preorder and Inorder Traversal
Medium
Maximum Product of Three Numbers
Easy
Two Sum
Easy
Implement Stack using Queues
Easy
Longest Substring with At Most K Distinct Characters
Hard
Serialize and Deserialize Binary Tree
Hard
3Sum
Medium
Maximum Subarray
Easy
Maximal Rectangle
Hard
Number of Islands
Medium
Implement Queue using Stacks
Easy
Word Search II
Hard
Climbing Stairs
Easy
Implement strStr()
Easy
Meeting Rooms II
Medium
Reverse Words in a String
Medium
String to Integer (atoi)
Medium
Binary Tree Level Order Traversal
Medium
Maximum Length of Repeated Subarray
Medium
Best Position for a Service Centre
Hard
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