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46 problems total

Array (1906)Sorting (442)Depth First Search (316)Database (301)Breadth First Search (241)Tree (241)Stack (172)Graph Theory (169)Linked List (81)Monotonic Stack (67)Queue (50)Recursion (48)Shortest Path (33)

All Topics(4301)Database(305)Java(0)Networking(0)Object Oriented Design(31)Programming Languages(5)System Design(0)Algorithms(3945)

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Title	Difficulty	Videos	Companies
Find the Index of the First Occurrence in a String	easy	-	adobe amazon apple
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
Median of Two Sorted Arrays	hard	-	adobe airbnb alibaba
Longest Palindromic Substring	medium		adobe airbnb alibaba
3Sum0 - Find three elements in an array that sum to a zero	medium		adobe akuna-capital alibaba
3Sum - Closest	medium	-	adobe amazon apple
Remove Nth Node From End of List	medium		adobe amazon apple
Valid Parentheses	easy		adobe airbnb akuna-capital
Merge Two Sorted Linked Lists	easy		adobe airbnb alibaba
Generate Parentheses	medium	-	adobe alibaba amazon
Merge K Sorted Lists	hard		adobe airbnb alibaba
Search in Rotated Sorted Array	medium		adobe alibaba amazon
Find first and last positions of target element in sorted array	medium	-	airbnb amazon apple
Trapping Rain Water	hard		adobe affirm airbnb
Rotate n x n matrix by 90 degrees	medium		adobe akuna-capital amazon
Group Anagrams	medium		adobe affirm amazon
Merge Overlapping Intervals	medium		adobe alibaba amazon
Spiral Matrix 2 - Generate	medium		adobe amazon apple
Simplify Path	medium	-	adobe amazon bloomberg
Merge Two Sorted Arrays	easy	-	adobe amazon apple
Validate Binary Search Tree	medium		adobe amazon apple
Symmetric Binary Tree	easy	-	adobe alibaba amazon
Valid Palindrome	easy		adobe amazon apple
Design LRU Cache	medium	-	adobe alibaba amazon
Evaluate Reverse Polish Notation	medium	-	amazon atlassian facebook
Count Primes	medium	-	adobe amazon apple
Reverse Linked List	easy		adobe alibaba amazon
Summary Ranges	easy	-	amazon bloomberg capital-one
Implement Queue using Stacks	easy	-	amazon apple bloomberg
Least Number of Perfect Squares that Sums to n	medium	-	adobe amazon apple
Zigzag Iterator	medium	-	amazon apple cruise-automation
Move Zeroes at the end of array	easy	-	adobe amazon apple
Reconstruct Itinerary	hard	-	amazon apple bloomberg
Intersection of Two Arrays 2 - Duplicates allowed	easy	-	amazon apple bloomberg
Insert Delete Search and GetRandom in Constant Time 1 - Dupes not allowed	medium	-	adobe affirm amazon
String Compression	medium	-	akuna-capital amazon apple
Serialize and Deserialize Binary Search Tree BST	medium	-	amazon bytedance ebay
Max Consecutive Ones II	medium	-	google yandex
Subarray Sum Equals K	medium	-	adobe amazon apple
Permutation in String	medium	-	amazon bloomberg facebook
Number of Recent Calls	easy	-	bloomberg google yandex
Subarray Sums Divisible by K	medium		amazon bytedance expedia
Max Consecutive Ones III	medium	-	amazon facebook microsoft
Longest Subarray of Ones After Deleting One Element	medium	-	yandex

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