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45 problems total

Array (174)Sorting (45)Depth First Search (44)Tree (41)Breadth First Search (35)Linked List (28)Stack (27)Recursion (18)Graph Theory (12)Monotonic Stack (8)Queue (6)Shortest Path (2)

All Topics(4301)Bash(0)Database(0)Java(0)Javascript(0)Networking(0)Object Oriented Design(1)Programming Languages(0)SQL(0)System Design(0)Algorithms(522)

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Title	Difficulty	Videos	Companies
Stack of plates	medium	-	microsoft amazon
Design LRU Cache	medium	-	adobe alibaba amazon
Min Stack	medium		adobe amazon apple
Binary Search Tree BST Inorder Iterator	medium	-	alibaba amazon apple
Implement Trie	medium		amazon apple bloomberg
Design Add and Search Words Data Structure	medium		airbnb amazon apple
Implement stack using queues	easy	-	amazon bloomberg citadel
Implement Queue using Stacks	easy	-	amazon apple bloomberg
Encode and Decode Strings	medium		bloomberg google microsoft
Zigzag Iterator	medium	-	amazon apple cruise-automation
Peeking Iterator	medium	-	amazon apple atlassian
Find Median from Data Stream	hard		adobe amazon apple
Serialize and Deserialize Binary Tree	hard		amazon apple bloomberg
Range Sum Query - Immutable	easy	-	amazon bloomberg facebook
Range Sum Query 2D - Immutable	medium	-	amazon apple cruise-automation
Range Sum Query 2D - Mutable	medium	-	facebook google microsoft
Flatten Nested List Iterator	medium	-	airbnb amazon apple
Moving Average of Last N numbers in a Stream	easy	-	amazon appdynamics bloomberg
Design Tic-Tac-Toe	medium	-	amazon apple bloomberg
Logger Rate Limiter	easy	-	amazon apple atlassian
Design Hit Counter	medium	-	affirm amazon apple
Design Phone Directory	medium	-	dropbox google microsoft
Insert Delete Search and GetRandom in Constant Time 1 - Dupes not allowed	medium	-	adobe affirm amazon
Insert Delete Search and GetRandom in Constant Time 2 - Duplicates allowed	hard	-	affirm amazon apple
Shuffle an Array	medium	-	amazon apple bloomberg
Encode N-ary Tree to Binary Tree	hard	-	microsoft
All O`one Data Structure	hard		amazon bloomberg facebook
Serialize and Deserialize Binary Search Tree BST	medium	-	amazon bytedance ebay
LFU Cache	hard	-	adobe alibaba amazon
Encode and Decode TinyURL	medium	-	adobe amazon bloomberg
Design Circular Queue	medium	-	airbnb amazon apple
Design Excel Sum Formula	hard	-	amazon microsoft
Design Search Autocomplete System	hard	-	amazon apple bloomberg
Implement Magic Dictionary	medium	-	facebook google microsoft
Kth Largest Element in a Stream	easy		adobe amazon apple
Design HashMap	easy	-	adobe amazon apple
Design Linked List	medium	-	amazon microsoft oracle
Max Stack	hard	-	amazon bloomberg facebook
My Calendar 1	medium	-	amazon apple google
Maximum Frequency Stack	hard	-	amazon apple bloomberg
Online Stock Span	medium	-	amazon google microsoft
Time Based Key-Value Store	medium	-	amazon apple atlassian
Design Skiplist	hard	-	ebay google microsoft
Maximum Length of a Concatenated String with Unique Characters	medium	-	honey microsoft tesla
Design a Stack With Increment Operation	medium	-	microsoft