Problem library

Design

All problems that are about designing a system.

46 / 46 problems

Problem	Category	Time	Solved
LFU cache linked-list design	linked list design	O(1)	Jan 29, 2023
Design a leaderboard array-and-hashmap design	array and hashmap design	O(1)	Dec 28, 2022
Prefix and suffix search array-and-hashmap design	array and hashmap design	O(n)	Dec 27, 2022
Moving average from data stream queue design	queue design	O(1)	Dec 13, 2022
Design hit counter design queue	design queue	O(n)	Dec 9, 2022
Range frequency queries binary-search design	binary search design	O(log(n))	Dec 8, 2022
Design tic tac toe design	design	O(1)	Dec 7, 2022
Encode and decode strings design	design	O(n)	Dec 6, 2022
Implement trie II (prefix tree) trie design	trie design	O(n)	Dec 4, 2022
Unique word abbreviation array-and-hashmap design	array and hashmap design	O(n)	Nov 30, 2022
Design hashset design array-and-hashmap	design array and hashmap	O(1)	Nov 28, 2022
Design phone directory design	design	O(1)	Nov 28, 2022
Random pick index array-and-hashmap design	array and hashmap design	O(1)	Nov 22, 2022
Shuffle an array math-and-geometry design	math and geometry design	O(n)	Nov 22, 2022
design linked list linked-list design	linked list design	—	Nov 21, 2022
Maximum frequency stack stack design	stack design	—	Nov 13, 2022
Design an ordered stream design	design	O(n)	Nov 6, 2022
Encode and decode tinyurl design	design	O(1)	Nov 4, 2022
Longest uploaded prefix heap design	heap design	O(n)	Oct 26, 2022
Serialize and deserialize bst tree design	tree design	O(n)	Oct 25, 2022
Number of recent calls queue design	queue design	O(n)	Oct 11, 2022
Design front middle back queue queue design	queue design	O(1)	Sep 29, 2022
Product of the last k numbers queue design	queue design	O(1)	Sep 28, 2022
Design circular deque queue design	queue design	O(1)	Sep 27, 2022
Flatten nested list iterator queue design	queue design	O(n)	Sep 27, 2022
Iterator for combination design backtracking	design backtracking	O(nCk)	Sep 17, 2022
Design an atm machine greedy design	greedy design	O(1)	Sep 16, 2022
Finding pairs with a certain sum design	design	O(n+m)	Sep 16, 2022
Range sum query immutable design	design	O(n)	Sep 13, 2022
Design a food rating system heap design	heap design	O(nlog(n))	Sep 9, 2022
Peeking iterator design	design	O(1)	Sep 9, 2022
Design a stack with increment operation design stack	design stack	O(1)	Sep 6, 2022
Implement magic dictionary trie design	trie design	O(n^2)	Sep 6, 2022
Design underground system design	design	O(1)	Sep 3, 2022
Design parking system array-and-hashmap design	array and hashmap design	O(1)	Aug 19, 2022
Design circular queue queue design	queue design	O(1)	Aug 13, 2022
Find median from data stream heap design	heap design	O(1)	Aug 7, 2022
Design twitter heap design	heap design	O(1)	Aug 6, 2022
Serialize and deserialize binary tree tree design	tree design	O(n)	Aug 6, 2022
LRU cache linked-list design	linked list design	O(1)	Aug 5, 2022
Implement queue using stacks queue design	queue design	O(1)	Jul 24, 2022
Design add and search words data structure trie design	trie design	O(n)	Jul 23, 2022
Time based key value store binary-search design	binary search design	O(1)	Jul 23, 2022
Implement stack using queues queue design	queue design	O(1)	Jul 21, 2022
Implement trie prefix tree trie design	trie design	O(n)	Jul 21, 2022
Min stack stack design	stack design	O(n+n)	Jul 19, 2022