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74 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
Design and implement Connect 4	hard	-	salesforce
Kaprekar's Constant Calculator	medium	-	salesforce
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
Integer To Roman	medium	-	adobe amazon apple
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
Valid Parentheses	easy		adobe airbnb akuna-capital
Generate Parentheses	medium	-	adobe alibaba amazon
Merge K Sorted Lists	hard		adobe airbnb alibaba
Search in Rotated Sorted Array	medium		adobe alibaba amazon
Valid Sudoku	medium		adobe amazon apple
First Missing Positive	hard	-	adobe amazon apple
Trapping Rain Water	hard	-	adobe affirm airbnb
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
Merge Overlapping Intervals	medium		adobe alibaba amazon
Simplify Path	medium	-	adobe amazon bloomberg
Set Matrix Zeros	medium		adobe amazon apple
Minimum Window Substring	hard		adobe airbnb amazon
Remove duplicates from Sorted List 2	medium		adobe amazon apple
Remove duplicates from Sorted List 1	easy		adobe amazon apple
Validate Binary Search Tree	medium		adobe amazon apple
Symmetric Binary Tree	easy	-	adobe alibaba amazon
Word Ladder 1 - Get Ladder Length	hard	-	affirm amazon apple
Candy distribution	hard	-	amazon apple google
Word Break 1 - Check if word is breakable	medium		adobe amazon apple
Design LRU Cache	medium	-	adobe alibaba amazon
Reverse Words in a String	medium	-	amazon apple bloomberg
Find Minimum in Rotated Sorted Array	medium		amazon apple bloomberg
Largest Number From Given Numbers	medium		amazon apple bytedance
Number of Islands	medium		adobe affirm alibaba
Isomorphic Strings	easy		adobe amazon bloomberg
Course Schedule 1 - Is it Possible	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
Kth Largest Element in an Array	medium	-	adobe airbnb alibaba
Skyline Problem	hard	-	adobe amazon apple
Invert Binary Tree	easy		amazon apple bloomberg
Implement Queue using Stacks	easy	-	amazon apple bloomberg
Lowest Common Ancestor of a Binary Tree	medium		adobe airbnb amazon
Product of Array Except Self	medium		adobe amazon apple
Search a 2D Matrix 2 - Rows and columns are sorted	medium	-	adobe amazon apple
Flatten 2D Vector	medium	-	airbnb apple facebook
Graph Valid Tree	medium		amazon facebook google
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

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