Dashboard Questions Topics Companies Sheets

Design

Topic

123 coding problems covering Design concepts. Master this topic and improve your problem-solving skills.

123

Problems

Easy

Medium

Hard

Difficulty

All123 Easy14 Medium79 Hard30

Title	Solve	Difficulty	Companies	Topics
146. LRU Cache	Solve	Medium	Accolite+56	Design Doubly-Linked List+2
155. Min Stack	Solve	Medium	Adobe+7	Design Stack
170. Two Sum III - Data structure design	Solve	Easy	LinkedIn	Array Data Stream+3
173. Binary Search Tree Iterator	Solve	Medium	Amazon+5	Binary Search Tree Binary Tree+4
208. Implement Trie (Prefix Tree)	Solve	Medium	Amazon+8	Design Hash Table+2
211. Design Add and Search Words Data Structure	Solve	Medium	Amazon+6	Depth-First Search Design+2
225. Implement Stack using Queues	Solve	Easy	Accenture+54	Design Queue+1
232. Implement Queue using Stacks	Solve	Easy	Amazon+4	Design Queue+1
244. Shortest Word Distance II	Solve	Medium	LinkedIn	Array Design+3
251. Flatten 2D Vector	Solve	Medium	Airbnb	Array Design+2
271. Encode and Decode Strings	Solve	Medium	Facebook+1	Array Design+1
281. Zigzag Iterator	Solve	Medium	Amazon+3	Array Design+2
284. Peeking Iterator	Solve	Medium	Amazon+3	Array Design+1
288. Unique Word Abbreviation	Solve	Medium	Facebook+1	Array Design+2
295. Find Median from Data Stream	Solve	Hard	Adobe+33	Data Stream Design+3
297. Serialize and Deserialize Binary Tree	Solve	Hard	Amazon+8	Binary Tree Breadth-First Search+4
303. Range Sum Query - Immutable	Solve	Easy	Facebook	Array Design+1
304. Range Sum Query 2D - Immutable	Solve	Medium	Amazon+4	Array Design+2
307. Range Sum Query - Mutable	Solve	Medium	Amazon+1	Array Binary Indexed Tree+2
308. Range Sum Query 2D - Mutable	Solve	Medium	Google	Array Binary Indexed Tree+3
341. Flatten Nested List Iterator	Solve	Medium	Airbnb+10	Depth-First Search Design+4
346. Moving Average from Data Stream	Solve	Easy	Amazon+3	Array Data Stream+2
348. Design Tic-Tac-Toe	Solve	Medium	Adobe+4	Array Design+3
352. Data Stream as Disjoint Intervals	Solve	Hard	Microsoft	Binary Search Design+1
353. Design Snake Game	Solve	Medium	Amazon+6	Array Design+3
355. Design Twitter	Solve	Medium	Amazon+2	Design Hash Table+2
359. Logger Rate Limiter	Solve	Easy	Amazon+5	Data Stream Design+1
362. Design Hit Counter	Solve	Medium	Affirm+7	Array Binary Search+3
379. Design Phone Directory	Solve	Medium	Amazon+1	Array Design+3
380. Insert Delete GetRandom O(1)	Solve	Medium	Affirm+8	Array Design+3
381. Insert Delete GetRandom O(1) - Duplicates allowed	Solve	Hard	Affirm+2	Array Design+3
384. Shuffle an Array	Solve	Medium	Apple+4	Array Design+2
431. Encode N-ary Tree to Binary Tree	Solve	Hard	-	Binary Tree Breadth-First Search+3
432. All O`one Data Structure	Solve	Hard	Amazon+2	Design Doubly-Linked List+2
449. Serialize and Deserialize BST	Solve	Medium	Amazon+2	Binary Search Tree Binary Tree+5
460. LFU Cache	Solve	Hard	Amazon+9	Design Doubly-Linked List+2
535. Encode and Decode TinyURL	Solve	Medium	Amazon+2	Design Hash Function+2
588. Design In-Memory File System	Solve	Hard	Amazon+5	Design Hash Table+3
604. Design Compressed String Iterator	Solve	Easy	Google	Array Design+2
622. Design Circular Queue	Solve	Medium	Airbnb+5	Array Design+2
631. Design Excel Sum Formula	Solve	Hard	Google+1	Array Design+3
635. Design Log Storage System	Solve	Medium	Twitter	Design Hash Table+2
641. Design Circular Deque	Solve	Medium	-	Array Design+2
642. Design Search Autocomplete System	Solve	Hard	Amazon+5	Data Stream Depth-First Search+5
676. Implement Magic Dictionary	Solve	Medium	Facebook+1	Depth-First Search Design+3
677. Map Sum Pairs	Solve	Medium	Google	Design Hash Table+2
703. Kth Largest Element in a Stream	Solve	Easy	Adobe+4	Binary Search Tree Binary Tree+4
705. Design HashSet	Solve	Easy	Amazon+6	Array Design+3
706. Design HashMap	Solve	Easy	Adobe+26	Array Design+3
707. Design Linked List	Solve	Medium	Amazon+4	Design Linked List