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509 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
Alternating Two-Instance Singleton Pattern	medium	-	google
Bishop diagonally attack on chess board	medium	-	google
Coin Change with Fewest Number of Coins Given Canonical System and Infinite Supply	medium	-	google
Coins In a Line Game	medium	-	square google
Construct Binary Search Tree BST from Postorder Traversal	medium	-	google
Count Inversions - Count Smaller on Right	medium	-	google
Design a data structure for generic deck of cards	medium	-	google amazon
Estimating the value of Pi using Monte Carlo method	medium	-	google
Divide Two Integers	medium	-	adobe amazon apple
First Unique Character in a Stream of Characters	medium	-	amazon google microsoft
Fix the variable capture in closure	medium	-	google
m Coloring Problem	medium	-	google
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
Container With Most Water	medium		adobe amazon apple
Integer To Roman	medium	-	adobe amazon apple
3Sum0 - Find three elements in an array that sum to a zero	medium		adobe akuna-capital alibaba
3Sum - Closest	medium	-	adobe amazon apple
Letter Combinations of a Phone Number	medium	-	amazon apple atlassian
4Sum	medium	-	adobe amazon apple
Remove Nth Node From End of List	medium		adobe amazon apple
Generate Parentheses	medium	-	adobe alibaba amazon
Letter Tile Possibilities	medium		google microsoft
Locking and unlocking resources represented as binary tree nodes	medium	-	google
Longest Substring with K Distinct Characters	medium	-	google
Minimum Columns to Remove for Lexicographical Order in Matrix	medium	-	google
Nearest larger number for index in an array	medium	-	google
OOP - Inheritance Vs Composition	medium	-	google
Shortest Unique Prefix	medium	-	google square
Smallest set to cover all intervals	medium	-	google microsoft
Sort a linked list in O(n log n) time and constant space	medium	-	google
Swap Nodes in Pairs	medium	-	adobe amazon apple
Next Permutation	medium	-	adobe amazon apple
Search in Rotated Sorted Array	medium		adobe alibaba amazon
Find first and last positions of target element in sorted array	medium	-	airbnb amazon apple
Valid Sudoku	medium	-	adobe amazon apple
Count and Say Sequence	medium	-	adobe amazon apple
Combination Sum 1	medium		airbnb akuna-capital amazon
Combination Sum 2 - Cant Reuse same element	medium	-	adobe amazon apple
Multiply Strings	medium	-	amazon apple expedia
Rotate n x n matrix by 90 degrees	medium		adobe akuna-capital amazon
Jump Game 2 - Get min jumps	medium	-	adobe amazon apple
Permutations of Array 1	medium	-	adobe amazon apple
Group Anagrams	medium		adobe affirm amazon
Implement Power Function 1	medium	-	adobe amazon apple
Maximum Subarray Sum	medium		adobe alibaba amazon
Spiral Matrix 1 - Return	medium		adobe amazon apple

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