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91 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)

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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
Integer To Roman	medium	-	adobe amazon apple
Roman To Integer	easy		adobe amazon apple
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
Generate Parentheses	medium	-	adobe alibaba amazon
Substring with Concatenation of All Words	hard	-	adobe amazon apple
Longest Valid Parentheses	hard	-	adobe amazon apple
Count and Say Sequence	medium	-	adobe amazon apple
Multiply Strings	medium	-	amazon apple expedia
Group Anagrams	medium		adobe affirm amazon
Valid Number	hard	-	adobe amazon apple
Add Binary Strings	easy	-	adobe amazon apple
Text Justification	hard	-	airbnb amazon apple
Edit Distance	medium	-	adobe amazon apple
Minimum Window Substring	hard		adobe airbnb amazon
Word Search 1 - Find if word exists	medium		adobe amazon apple
Scramble String	hard	-	apple google
Decode Ways	medium		adobe amazon apple
Restore IP Addresses	medium	-	adobe amazon apple
Interleaving String	medium	-	amazon apple bloomberg
Valid Palindrome	easy		adobe amazon apple
Word Ladder 2 - Get all the ladders	hard	-	amazon apple bloomberg
Word Ladder 1 - Get Ladder Length	hard	-	affirm amazon apple
Word Break 1 - Check if word is breakable	medium		adobe amazon apple
Word Break 2 - Construct a sentence	hard		amazon apple audible
Reverse Words in a String	medium	-	amazon apple bloomberg
Compare Version Numbers	medium		amazon apple arista-networks
Fraction to Recurring Decimal	medium	-	airbnb amazon apple
Excel Sheet Column Title	easy	-	adobe apple facebook
Excel Sheet Column Number	easy	-	amazon apple bloomberg
Largest Number From Given Numbers	medium		amazon apple bytedance
Repeated DNA Sequences	medium	-	amazon apple google
Implement Trie	medium		amazon apple bloomberg
Design Add and Search Words Data Structure	medium		airbnb amazon apple
Word Search 2 - Return All Words	hard		airbnb amazon apple
Basic Calculator 2 Problem	medium	-	airbnb amazon apple
Valid Anagram	easy		amazon apple bloomberg
Binary Tree Path - All root to leaf paths	easy	-	adobe amazon apple
Palindrome Permutation	easy	-	amazon apple bloomberg
Alien Dictionary	hard		airbnb amazon apple
Integer to English Words	hard		amazon apple barclays
Expression Add Operators	hard	-	apple bytedance facebook
Serialize and Deserialize Binary Tree	hard		amazon apple bloomberg
Remove Invalid Parentheses Problem	hard	-	amazon apple bloomberg

Showing 1 to 50 of 91 results