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69 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)Database(305)Networking(0)Object Oriented Design(31)Programming Languages(5)System Design(0)Algorithms(3944)

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Title	Difficulty	Videos	Companies
Two Sum	easy		adobe aetion affirm
Add Two Numbers represented as Linked List in Reversed Order	medium	-	adobe aetion airbnb
Longest Substring Without Repeating Characters	medium		adobe alation alibaba
Longest Palindromic Substring	medium		adobe airbnb alibaba
Reverse Integer	medium	-	adobe amazon apple
Convert String to Integer atoi	medium	-	adobe amazon apple
Longest Common Prefix in array of string	easy	-	adobe alibaba amazon
3Sum0 - Find three elements in an array that sum to a zero	medium		adobe akuna-capital alibaba
Letter Combinations of a Phone Number	medium	-	amazon apple atlassian
Remove Nth Node From End of List	medium		adobe amazon apple
Valid Parentheses	easy		adobe airbnb akuna-capital
Merge Two Sorted Linked Lists	easy		adobe airbnb alibaba
Generate Parentheses	medium	-	adobe alibaba amazon
Merge K Sorted Lists	hard		adobe airbnb alibaba
K Reverse a linked list	hard	-	adobe amazon apple
Remove duplicates from Sorted Array 1	easy		adobe amazon apple
Search in Rotated Sorted Array	medium		adobe alibaba amazon
Rotate n x n matrix by 90 degrees	medium		adobe akuna-capital amazon
Permutations of Array 1	medium	-	adobe amazon apple
Group Anagrams	medium		adobe affirm amazon
Maximum Subarray Sum	medium		adobe alibaba amazon
Spiral Matrix 1 - Return	medium		adobe amazon apple
Merge Overlapping Intervals	medium		adobe alibaba amazon
Swap odd and even bits in an integer	medium	-	cisco
Merge Two Sorted Arrays	easy	-	adobe amazon apple
Decode Ways	medium		adobe amazon apple
Binary Tree Level Order Traversal - Level by Level	medium		adobe amazon apple
Convert Sorted Array to height-balanced Binary Search Tree	easy		airbnb amazon apple
Balanced Binary Tree	easy	-	adobe amazon apple
Best Time To Buy And Sell Stock 1 - only one transaction	easy		adobe akuna-capital alibaba
Valid Palindrome	easy		adobe amazon apple
Linked List Cycle 1 - Detect Cycle	easy		adobe amazon apple
Reorder List such that i-th element points to n-i-th element	medium		adobe amazon apple
Binary Tree Preorder Traversal	easy	-	amazon bloomberg cisco
Design LRU Cache	medium	-	adobe alibaba amazon
Reverse Words in a String	medium	-	amazon apple bloomberg
Intersection of Two Linked Lists	easy	-	airbnb alibaba amazon
Binary Search Tree BST Inorder Iterator	medium	-	alibaba amazon apple
Rotate an Array to Right	medium	-	amazon bloomberg cisco
Number of 1 Bits	easy		adobe amazon apple
House Robber	medium		adobe airbnb amazon
Number of Islands	medium		adobe affirm alibaba
Reverse Linked List	easy		adobe alibaba amazon
Course Schedule 1 - Is it Possible	medium		amazon apple bloomberg
Word Search 2 - Return All Words	hard		airbnb amazon apple
Palindrome Linked List	easy	-	adobe amazon apple
Lowest Common Ancestor of a Binary Search Tree	medium		adobe amazon bloomberg
Delete non-tail Node in linked list, Given only access to that Node	medium		adobe amazon apple
Different Ways to Add Parentheses	medium	-	amazon cisco citadel
Valid Anagram	easy		amazon apple bloomberg

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