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Title	Difficulty	Videos	Companies
Basic Calculator 1	hard	-	adobe amazon bloomberg
Implement stack using queues	easy	-	amazon bloomberg citadel
Invert Binary Tree	easy		amazon apple bloomberg
Basic Calculator 2 Problem	medium	-	airbnb amazon apple
Summary Ranges	easy	-	amazon bloomberg capital-one
Majority Element 2 - With n by 3 definition	medium	-	adobe amazon apple
Kth Smallest Element in a BST	medium		affirm amazon apple
Power of Two	easy	-	amazon apple google
Implement Queue using Stacks	easy	-	amazon apple bloomberg
Number of Digit One	hard	-	amazon apple
Palindrome Linked List	easy	-	adobe amazon apple
Lowest Common Ancestor of a Binary Search Tree	medium		adobe amazon bloomberg
Lowest Common Ancestor of a Binary Tree	medium		adobe airbnb amazon
Delete non-tail Node in linked list, Given only access to that Node	medium		adobe amazon apple
Product of Array Except Self	medium		adobe amazon apple
Sliding Window Maximum	hard	-	adobe alibaba amazon
Search a 2D Matrix 2 - Rows and columns are sorted	medium	-	adobe amazon apple
Different Ways to Add Parentheses	medium	-	amazon cisco citadel
Valid Anagram	easy		amazon apple bloomberg
Shortest Word Distance 1	easy	-	amazon google linkedin
Shortest Word Distance 2	medium	-	amazon ebay linkedin
Shortest Word Distance 3	medium	-	linkedin
Strobogrammatic Number 1 - Check if strobogrammatic	easy	-	cisco facebook google
Strobogrammatic Number 2 - Generate for length n	medium	-	cisco facebook google
Strobogrammatic Number 3 - Count in Range	hard	-	facebook google
Group Shifted Strings	medium	-	amazon facebook google
Count Univalue Subtrees	medium	-	amazon bloomberg box
Flatten 2D Vector	medium	-	airbnb apple facebook
Egyptian Fraction	easy	-	palantir
Meeting Rooms 1 - Can person attend all meetings	easy		amazon bloomberg facebook
Maximum Intervals Overlap Count	medium		amazon apple atlassian
Factor Combinations	medium	-	google linkedin pinterest
Prune Unary nodes to form Full Binary Tree	medium	-	yahoo
Verify Preorder Sequence in Binary Search Tree	medium	-	mathworks uber zenefits
Paint House 1 - N houses with 3 colors with no two adjacent houses with same color color	medium	-	apple linkedin microsoft
Binary Tree Path - All root to leaf paths	easy	-	adobe amazon apple
Add Digits in Number	easy	-	adobe apple bloomberg
3Sum Smaller	medium	-	google ibm mathworks
Single Number 3 - All elements except two occur twice	medium	-	amazon apple facebook
Graph Valid Tree	medium		amazon facebook google
Trips and Users	hard	-	amazon uber
Ugly Number	easy		facebook
Generate nth ugly number	medium	-	amazon oracle uber
Paint House 2 - N houses with k colors with no two adjacent houses with same color color	hard	-	facebook google linkedin
Palindrome Permutation	easy	-	amazon apple bloomberg
Palindrome Permutation II	medium	-	amazon google microsoft
Missing Number	easy		adobe amazon apple
Alien Dictionary	hard		airbnb amazon apple
Closest Binary Search Tree Value	easy	-	amazon bloomberg facebook
Encode and Decode Strings	medium		bloomberg google microsoft

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