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Title	Difficulty	Videos	Companies
Count Non-Decreasing Subarrays After K Operations	hard	-
Double Stacks	easy	-
Find Mirror Score of a String	medium	-
Implement 3 stacks in 1 list	hard	-	microsoft
Valid Parentheses	easy		adobe airbnb akuna-capital
Make Array Non-decreasing	medium	-
Maximum and Minimum Sums of at Most Size K Subarrays	hard	-
Minimum Cost Tree From Leaf Values	medium	-
Minimum Operations to Convert All Elements to Zero	medium	-
Stack of plates	medium	-	microsoft amazon
Longest Valid Parentheses	hard	-	adobe amazon apple
Trapping Rain Water	hard	-	adobe affirm airbnb
Simplify Path	medium	-	adobe amazon bloomberg
Largest Rectangle in Histogram	hard	-	adobe amazon bloomberg
Maximal Rectangle	hard	-	adobe amazon bloomberg
Binary Tree Inorder Traversal	easy	-	alibaba amazon apple
Flatten binary tree to linked list in order of preorder traversal	medium	-	adobe amazon apple
Reorder List such that i-th element points to n-i-th element	medium		adobe amazon apple
Binary Tree Preorder Traversal	easy	-	amazon bloomberg cisco
Binary Tree Postorder Traversal	easy	-	adobe amazon facebook
Evaluate Reverse Polish Notation	medium	-	amazon atlassian facebook
Min Stack	medium	-	adobe amazon apple
Binary Search Tree BST Inorder Iterator	medium	-	alibaba amazon apple
Basic Calculator 1	hard	-	adobe amazon bloomberg
Implement stack using queues	easy	-	amazon bloomberg citadel
Basic Calculator 2 Problem	medium	-	airbnb amazon apple
Implement Queue using Stacks	easy	-	amazon apple bloomberg
Palindrome Linked List	easy	-	adobe amazon apple
Verify Preorder Sequence in Binary Search Tree	medium	-	mathworks uber zenefits
Closest Binary Search Tree Value II	hard	-	amazon facebook forusall
Remove Duplicate Letters	medium	-	adobe amazon apple
Create Maximum Number	hard	-	amazon google
Verify Preorder Serialization of a Binary Tree	medium	-	google
Flatten Nested List Iterator	medium	-	airbnb amazon apple
Nested List Weight Sum 2	medium	-	didi facebook linkedin
Mini Parser	medium	-	airbnb google
Longest Absolute File Path	medium	-	amazon apple facebook
Decode String	medium	-	alibaba amazon appdynamics
Remove K Digits	medium	-	adobe amazon bloomberg
Convert Binary Search Tree to Sorted Doubly Linked List	medium	-	amazon bloomberg databricks
Ternary Expression Parser	medium	-	snapchat
Add Two Numbers represented as Linked List in Forward order	medium	-	amazon apple bloomberg
132 Pattern	medium	-	amazon facebook google
Find Permutation	medium	-	google
Zuma Game	hard	-	baidu bloomberg
Next Greater Element 1	easy	-	amazon bloomberg facebook
Next Greater Element 2	medium	-	amazon bloomberg facebook
Construct Binary Tree from String	medium	-	amazon facebook
Shortest Unsorted Continuous Subarray	medium	-	amazon bloomberg google
N-ary Tree Preorder Traversal	easy	-

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