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4301 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
Count Inversions - Count Smaller on Right	medium	-	google
Count Knight's Tour	hard	-	google
Count Mentions Per User	medium	-
Count N-Digit Stepping Numbers	medium	-
Count Non-Decreasing Subarrays After K Operations	hard	-
Count Number of Leaf Nodes in Binary Tree	medium	-
Count number of ways to fill an n x 4 grid using 1 x 4 tiles	easy	-
Count Numbers with Non-Decreasing Digits	hard	-
Count Occurrences of Anagram	medium	-
Count of Pairs of Squares Summing to N Squared	easy	-
Count Pairs with Given Sum and XOR	easy	-	jane-street
Count Partitions with Even Sum Difference	easy	-
Count Paths With the Given XOR Value	medium	-
Count reverse pairs in two individually sorted parts of an array	medium	-
Count Sorted Vowel Strings	medium	-
Count Special Subsequences	medium	-
Count Squares on a Chessboard	easy	-
Count Subarrays of Length Three With a Condition	easy	-
Count Substrings Divisible By Last Digit	hard	-
Count the divisors of a given number	easy	-
Count the number of 2s between 0 and n	hard	-
Count the Number of Arrays with K Matching Adjacent Elements	hard	-
Count the number of elements from one array less than or equal to elements in another array	medium	-	amazon
Count Ways to Tile a 3xN Board using 1x3 and 3x1 tiles	medium	-
Counting roundtrip paths in a graph given a number of steps	medium	-
Create a word with a single 0-bit at the position of the rightmost 1-bit	easy	-
Create a word with a single 1-bit at the position of the rightmost 0-bit	easy	-
Create linked lists of all the nodes at each depth for a Binary Tree	medium	-
Create Sorted Array through Instructions	hard	-
Cron Cheatsheet	medium	-
Crossword Grid Validation	easy	-	palantir
Currency Exchange Problem as Shortest Path	medium	-	jane-street
De Bruijn Sequence	hard	-	LinkedIn
Decode a string to all valid interpretations	medium	-	uber
Decrypt Word with cumulative ASCII shift	easy	-
Deepest Left Node in a Binary Tree	medium	-
Delete a binary tree completely	medium	-
Delete List Nodes With Larger Value Node on the Right	medium	-
Delete X Nodes After Y Nodes	medium	-
Delivering Boxes from Storage to Ports	hard	-
Describe and give an example of Ad-hoc, Parametric and Subtype polymorphism	medium	-	microsoft
Design a 3D Binary Matrix with Efficient Layer Tracking	medium	-
Design a data structure for generic deck of cards	medium	-	google amazon
Design a data structure for generic deck of cards	medium	-
Design a Database for Storing Students' Grades	easy	-
Design a Sparse Array	easy	-	facebook
Design a vending machine like coffee vending machine	medium	-	inmobi
Design an Array Statistics Tracker	hard	-
Design and implement Connect 4	hard	-	salesforce
Design data structures for an online book reader system	medium	-

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