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145 problems total

Array (1905)Sorting (440)Depth First Search (316)Database (301)Breadth First Search (241)Tree (240)Stack (172)Graph Theory (169)Linked List (81)Monotonic Stack (67)Queue (50)Recursion (48)Shortest Path (33)
All Topics(4301)Algorithms(3944)Database(305)Networking(0)Object Oriented Design(31)Programming Languages(5)System Design(0)

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De Bruijn Sequencehard-
LinkedIn
Two Sumeasy
adobeaetionaffirm
Convert String to Integer atoimedium-
adobeamazonapple
Integer To Romanmedium-
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Roman To Integereasy
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Valid Parentheseseasy
adobeairbnbakuna-capital
Merge Two Sorted Linked Listseasy
adobeairbnbalibaba
Merge K Sorted Listshard
adobeairbnbalibaba
Minimum Flips to Separate X and Ymedium-
linkedin
Search in Rotated Sorted Arraymedium
adobealibabaamazon
Find first and last positions of target element in sorted arraymedium-
airbnbamazonapple
Combination Sum 1medium
airbnbakuna-capitalamazon
Combination Sum 2 - Cant Reuse same elementmedium-
adobeamazonapple
Permutations of Array 1medium-
adobeamazonapple
Permutations of Array 2 - Array has duplicatesmedium-
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Implement Power Function 1medium-
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Maximum Subarray Summedium
adobealibabaamazon
Spiral Matrix 1 - Returnmedium
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Merge Overlapping Intervalsmedium
adobealibabaamazon
Insert Intervalmedium
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Rotate Linked List to Rightmedium-
adobeairbnbamazon
Valid Numberhard-
adobeamazonapple
Text Justificationhard-
airbnbamazonapple
Square root of an integereasy-
amazonapplebloomberg
Climbing Stairs - Take atmost 2 Stepseasy
adobealibabaamazon
Edit Distancemedium-
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Dutch National Flag DNFmedium
amazonapplebloomberg
Minimum Window Substringhard
adobeairbnbamazon
Word Search 1 - Find if word existsmedium
adobeamazonapple
Partition Listmedium-
amazonapplelinkedin
Merge Two Sorted Arrayseasy-
adobeamazonapple
Validate Binary Search Treemedium
adobeamazonapple
Same Treeeasy
amazonapplebloomberg
Symmetric Binary Treeeasy-
adobealibabaamazon
Binary Tree Level Order Traversal - Level by Levelmedium
adobeamazonapple
Binary Tree Traversal - Zigzag Level Order Traversalmedium-
amazonapplebloomberg
Maximum Depth of Binary Treeeasy
adobeamazonapple
Path Sum 2 - find all root to leaf pathsmedium-
adobeamazonapple
Best Time To Buy And Sell Stock 1 - only one transactioneasy
adobeakuna-capitalalibaba
Valid Palindromeeasy
adobeamazonapple
Word Ladder 2 - Get all the laddershard-
amazonapplebloomberg
Word Ladder 1 - Get Ladder Lengthhard-
affirmamazonapple
Clone Undirected Graphmedium
amazonapplefacebook
Linked List Cycle 1 - Detect Cycleeasy
adobeamazonapple
Linked List Cycle 2 - Find Start of a Cyclemedium-
adobeamazonapple
Reorder List such that i-th element points to n-i-th elementmedium
adobeamazonapple
Design LRU Cachemedium-
adobealibabaamazon
Maximum Points on a Linehard-
amazonapplebloomberg
Evaluate Reverse Polish Notationmedium-
amazonatlassianfacebook
Maximum Product Subarraymedium
adobeakuna-capitalalibaba
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