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915 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
2-CNF Boolean Satisfiability Problem	hard	-	dropbox
8-Puzzle Solver	hard	-	airbnb
Add two numbers without using the plus operator	hard	-
Aho-Corasick Algorithm for Multi-Pattern String Search	hard	-
Alice Joins Probability Student Club by Calculating Expected Values of Probabilistic Games	hard	-	two-sigma
Amount of New Area Painted Each Day	hard	-
Analyze Organization Hierarchy	hard	-
Balance Parentheses with Minimum Insertions and Deletions	hard	-	facebook
Best Position for a Service Centre	hard	-	reddit
Binary Search Without Multiplication, Division and Bit-shift Operations	hard	-	netflix
Blackjack Optimal Strategy with Known Card Sequence	hard	-	MIT
Boolean Parenthesization Problem	hard	-	quantcast
Check If Digits Are Equal in String After Operations II	hard	-
Chess King Check Detector	hard	-	Oracle
Concatenated Divisibility	hard	-
Construct Cartesian Tree from Sequence	hard	-	netflix
Convert Binary Tree into Threaded Binary Tree	hard	-
Count Beautiful Numbers	hard	-
Count Connected Components in LCM Graph	hard	-
Count elements in range in sorted matrix	hard	-	google
Count Knight's Tour	hard	-	google
Count Non-Decreasing Subarrays After K Operations	hard	-
Count Numbers with Non-Decreasing Digits	hard	-
Count Substrings Divisible By Last Digit	hard	-
Count the number of 2s between 0 and n	hard	-
Count the Number of Arrays with K Matching Adjacent Elements	hard	-
Create Sorted Array through Instructions	hard	-
De Bruijn Sequence	hard	-	LinkedIn
Delivering Boxes from Storage to Ports	hard	-
Design an Array Statistics Tracker	hard	-
Design and implement Connect 4	hard	-	salesforce
Distributed Wikipedia Crawler System Design	hard	-	google
Divide array into two subsets with minimum difference	hard	-	microsoft
Dodgeball Team Division	hard	-	twitter
Equal Sum Grid Partition II	hard	-
Fancy Sequence	hard	-
Find a Value of a Mysterious Function Closest to Target	hard	-
Find all starting indices of anagrams of a word in a string	hard	-
Find Circular Gift Exchange Chains	hard	-
Find Invalid IP Addresses	hard	-
Find largest 1M numbers in 1B numbers	hard	-
Find Smallest window that contains all characters of string itself	hard	-
Find Sum of Array Product of Magical Sequences	hard	-
Find the Lexicographically Largest String From the Box II	hard	-
Find Time Required to Eliminate Bacterial Strains	hard	-
Find X Value of Array II	hard	-
First Letter Capitalization II	hard	-
Frequencies of Shortest Supersequences	hard	-
Ghost Word Game Winning Strategy	hard	-	two-sigma
Implement 3 stacks in 1 list	hard	-	microsoft

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