LFU cache - January 29, 2023

Design a leaderboard - December 28, 2022

Prefix and suffix search - December 27, 2022

Moving average from data stream - December 13, 2022

Design hit counter - December 9, 2022

Range frequency queries - December 8, 2022

Design tic tac toe - December 7, 2022

Encode and decode strings - December 6, 2022

Implement trie II (prefix tree) - December 4, 2022

Unique word abbreviation - November 30, 2022

Design hashset - November 28, 2022

Design phone directory - November 28, 2022

Random pick index - November 22, 2022

Shuffle an array - November 22, 2022

design linked list - November 21, 2022

Maximum frequency stack - November 13, 2022

Design an ordered stream - November 6, 2022

Encode and decode tinyurl - November 4, 2022

Longest uploaded prefix - October 26, 2022

Serialize and deserialize bst - October 25, 2022

Number of recent calls - October 11, 2022

Design front middle back queue - September 29, 2022

Product of the last k numbers - September 28, 2022

Design circular deque - September 27, 2022

Flatten nested list iterator - September 27, 2022

Iterator for combination - September 17, 2022

Design an atm machine - September 16, 2022

Finding pairs with a certain sum - September 16, 2022

Range sum query immutable - September 13, 2022

Peeking iterator - September 9, 2022

Design a food rating system - September 9, 2022

Implement magic dictionary - September 6, 2022

Design a stack with increment operation - September 6, 2022

Design underground system - September 3, 2022

Design parking system - August 19, 2022

Design circular queue - August 13, 2022

Find median from data stream - August 7, 2022

Design twitter - August 6, 2022

Serialize and deserialize binary tree - August 6, 2022

LRU cache - August 5, 2022

Implement queue using stacks - July 24, 2022

Design add and search words data structure - July 23, 2022

Time based key value store - July 23, 2022

Implement stack using queues - July 21, 2022

Implement trie prefix tree - July 21, 2022

Min stack - July 19, 2022