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29 problems total

Array (1906)Sorting (442)Depth First Search (316)Database (301)Breadth First Search (241)Tree (241)Stack (172)Graph Theory (169)Linked List (81)Monotonic Stack (67)Queue (50)Recursion (48)Shortest Path (33)

All Topics(4301)Database(305)Networking(0)Object Oriented Design(31)Programming Languages(5)System Design(0)Algorithms(3945)

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Title	Difficulty	Videos	Companies
Find the Index of the First Occurrence in a String	easy	-	adobe amazon apple
Longest Substring Without Repeating Characters	medium		adobe alation alibaba
Longest Palindromic Substring	medium		adobe airbnb alibaba
Convert String to Integer atoi	medium	-	adobe amazon apple
Regular Expression Matching	hard	-	adobe airbnb alibaba
Longest Common Prefix in array of string	easy	-	adobe alibaba amazon
Letter Combinations of a Phone Number	medium	-	amazon apple atlassian
Valid Parentheses	easy		adobe airbnb akuna-capital
Longest Valid Parentheses	hard	-	adobe amazon apple
Group Anagrams	medium		adobe affirm amazon
Minimum Window Substring	hard		adobe airbnb amazon
Valid Palindrome	easy		adobe amazon apple
Word Break 1 - Check if word is breakable	medium		adobe amazon apple
Word Break 2 - Construct a sentence	hard		amazon apple audible
Implement Trie	medium		amazon apple bloomberg
Design Add and Search Words Data Structure	medium		airbnb amazon apple
Basic Calculator 2 Problem	medium	-	airbnb amazon apple
Shortest Word Distance 2	medium	-	amazon ebay linkedin
Serialize and Deserialize Binary Tree	hard		amazon apple bloomberg
Reverse String	easy		adobe amazon apple
Rearrange String k Distance Apart	hard	-	amazon ebay facebook
Decode String	medium	-	alibaba amazon appdynamics
Serialize and Deserialize N-Ary Tree	hard	-	amazon apple ebay
String Compression	medium	-	akuna-capital amazon apple
Serialize and Deserialize Binary Search Tree BST	medium	-	amazon bytedance ebay
Minimum Window Subsequence	hard	-	amazon bloomberg ebay
Reorganize String	medium	-	amazon apple ebay
Rotate String	easy	-	amazon apple ebay
Binary Tree Cameras	hard	-	ebay facebook google