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System design HLD
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LLD leetcode
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LLD Questions by Difficulty and Company Tags
🟢 Easy-Level LLD
Table 7
Table 7
Problem
Companies
Core Concepts
Problem
Companies
Core Concepts
705. Design HashSet
Amazon, Google
Array-based bucket list, basic hashing
706. Design HashMap
Amazon, Facebook
Collision handling, chaining
1603. Design Parking System
Amazon
Simple class design, counters
There are no rows in this table
🟡 Medium-Level LLD
Table 8
Table 8
Problem
Companies
Core Concepts
Problem
Companies
Core Concepts
146. LRU Cache
Amazon, Google, Facebook
DLL + HashMap, eviction policy
208. Implement Trie
Google, Apple
Trie nodes, recursion
284. Peeking Iterator
LinkedIn
Iterator wrapper
981. Time Based Key-Value Store
Amazon
Binary search in history
348. Design Tic-Tac-Toe
Apple, Microsoft
Matrix design, game engine logic
362. Design Hit Counter
Bloomberg
Queue or bucket strategy
There are no rows in this table
🔴 Hard-Level LLD
Table 9
Table 9
Problem
Companies
Core Concepts
Problem
Companies
Core Concepts
355. Design Twitter
Twitter, Facebook
Class design, heap, timelines
460. LFU Cache
Google, Amazon
Frequency map + DLL
381. Insert Delete GetRandom O(1) - Duplicates allowed
Google
HashMap of index sets
432. All Oone Data Structure
Facebook
DLL with bucket frequency
There are no rows in this table
🔧 Real-World Analogy Problems
Table 10
Table 10
Problem
Use Case
Design Topic
Problem
Use Case
Design Topic
642. Design Search Autocomplete System
Typing assistant
Trie + min-heap
1286. Iterator for Combination
Password generator
Iterators, combinations
895. Maximum Frequency Stack
Undo Stack, Browser Tabs
Map of stacks
710. Random Pick with Blacklist
Random selection system
Mapping + sampling
There are no rows in this table
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