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45 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
Find the Index of the First Occurrence in a String	easy	-	adobe amazon apple
Reverse Integer	medium	-	adobe amazon apple
Next Permutation	medium	-	adobe amazon apple
Longest Valid Parentheses	hard	-	adobe amazon apple
Valid Sudoku	medium		adobe amazon apple
Combination Sum 1	medium		airbnb akuna-capital amazon
Permutations of Array 1	medium	-	adobe amazon apple
Permutations of Array 2 - Array has duplicates	medium	-	adobe amazon apple
Spiral Matrix 1 - Return	medium		adobe amazon apple
Search a 2D Matrix 1 - Elements sorted row-wise and first integer of each row is greater than last element of previous row is greater than last element of previous row	medium	-	adobe amazon apple
Search in Rotated Sorted Array 2 - Check if number exists - Duplicates allowed	medium	-	adobe amazon bloomberg
Largest Rectangle in Histogram	hard	-	adobe amazon bloomberg
Construct Binary Tree from Inorder and Postorder Traversal	medium	-	amazon bloomberg facebook
Convert Sorted List into a height-balanced Binary search Tree	medium	-	amazon bloomberg facebook
Populate next pointer to right node in Binary Tree	medium	-	amazon bloomberg facebook
Best Time To Buy And Sell Stock 1 - only one transaction	easy		adobe akuna-capital alibaba
Binary Tree Path Sum - Maximum between any two nodes	hard		adobe amazon appdynamics
Insertion Sort on List	medium	-	bloomberg google microsoft
Excel Sheet Column Number	easy	-	amazon apple bloomberg
Number of trailing zeros in a factorial	medium	-	amazon bloomberg facebook
Rotate an Array to Right	medium	-	amazon bloomberg cisco
Count Primes	medium	-	adobe amazon apple
Shortest Palindrome 1 - Prepending characters	hard	-	adobe amazon bloomberg
Contains Duplicate 2 - within k distance	easy	-	adobe airbnb amazon
Find Duplicate Number in array containing n+1 numbers between 1 and n	medium	-	adobe amazon apple
Find Median from Data Stream	hard		adobe amazon apple
Serialize and Deserialize Binary Tree	hard		amazon apple bloomberg
Remove Invalid Parentheses Problem	hard	-	amazon apple bloomberg
Odd Even Linked List - Bring odd nodes first and even later	medium	-	amazon bloomberg capital-one
Top K Frequent Elements	medium		amazon apple bloomberg
Design Snake Game	medium	-	amazon apple bloomberg
Design Hit Counter	medium	-	affirm amazon apple
Lexicographical Numbers	medium		adobe bloomberg bytedance
Elimination Game	medium	-	amazon bloomberg quora
Remove K Digits	medium	-	adobe amazon bloomberg
Convert Binary Search Tree to Sorted Doubly Linked List	medium	-	amazon bloomberg databricks
Path Sum 3 - Count paths from parent to child	medium	-	amazon bloomberg facebook
Single Element in a Sorted Array	medium	-	amazon apple atlassian
Permutation in String	medium	-	amazon bloomberg facebook
Number of Longest Increasing Subsequence	medium	-	amazon bloomberg facebook
Accounts Merge	medium	-	amazon apple bloomberg
Cousins in Binary Tree	easy	-	adobe amazon bloomberg
Divisor Game	easy	-	bloomberg google visa
Maximum Number of Occurrences of a Substring	medium	-	bloomberg paypal roblox
Minimum Insertion Steps to Make a String Palindrome	hard	-	bloomberg google quora