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38 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
Add Two Numbers represented as Linked List in Reversed Order	medium	-	adobe aetion airbnb
Median of Two Sorted Arrays	hard	-	adobe airbnb alibaba
Longest Palindromic Substring	medium		adobe airbnb alibaba
Reverse Integer	medium	-	adobe amazon apple
Convert String to Integer atoi	medium	-	adobe amazon apple
Palindrome Number	easy		adobe amazon apple
Container With Most Water	medium		adobe amazon apple
Integer To Roman	medium	-	adobe amazon apple
Roman To Integer	easy		adobe amazon apple
3Sum - Closest	medium	-	adobe amazon apple
Generate Parentheses	medium	-	adobe alibaba amazon
Merge K Sorted Lists	hard		adobe airbnb alibaba
Substring with Concatenation of All Words	hard	-	adobe amazon apple
Search in Rotated Sorted Array	medium		adobe alibaba amazon
First Missing Positive	hard	-	adobe amazon apple
Rotate n x n matrix by 90 degrees	medium		adobe akuna-capital amazon
Permutations of Array 1	medium	-	adobe amazon apple
Insert Interval	medium		adobe amazon apple
Spiral Matrix 2 - Generate	medium		adobe amazon apple
Plus One 1 - Given number as array plus one	easy	-	adobe amazon apple
Add Binary Strings	easy	-	adobe amazon apple
Set Matrix Zeros	medium		adobe amazon apple
Minimum Window Substring	hard		adobe airbnb amazon
Maximal Rectangle	hard	-	adobe amazon bloomberg
Reverse Linked List 2 - between m and n	medium	-	adobe amazon apple
Unique BSTs 1 - Count	medium	-	adobe amazon apple
Path Sum 2 - find all root to leaf paths	medium	-	adobe amazon apple
Flatten binary tree to linked list in order of preorder traversal	medium	-	adobe amazon apple
Best Time To Buy And Sell Stock 2 - Any number of times	medium	-	adobe amazon apple
Linked List Cycle 1 - Detect Cycle	easy		adobe amazon apple
Linked List Cycle 2 - Find Start of a Cycle	medium	-	adobe amazon apple
Reorder List such that i-th element points to n-i-th element	medium		adobe amazon apple
Binary Tree Postorder Traversal	easy	-	adobe amazon facebook
Excel Sheet Column Title	easy	-	adobe apple facebook
Diameter Of a Binary Tree	easy	-	adobe amazon apple
Middle of the linked list	easy		adobe amazon apple
Vertical Order Traversal of a Binary Tree	hard	-	adobe amazon bloomberg
Wave Sort	medium	-	adobe google