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30 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
Coin Change - Count Number of Ways of representing Amount given Finite supply of denominations	medium	-
Count Binary Strings Without Consecutive 1s	easy	-
Count distinct binary trees for a given number of nodes	medium	-
Count Inversions - Count Smaller on Right	medium	-	google
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 Sorted Vowel Strings	medium	-
Count the number of 2s between 0 and n	hard	-
Counting roundtrip paths in a graph given a number of steps	medium	-
Count and Say Sequence	medium	-	adobe amazon apple
Unique BSTs 3 - Count given node keys between m and n	medium	-
Unique Paths in Grid - Count all paths moving right or down or diagonally	medium	-
Unique Paths in Grid 1 - Count all paths moving right or down	medium		adobe alibaba amazon
Unique Paths in Grid 2 - Count all paths moving right or down with obstacles	medium	-	amazon apple bloomberg
Decode Ways	medium		adobe amazon apple
Unique BSTs 1 - Count	medium	-	adobe amazon apple
Number of 1 Bits	easy		adobe amazon apple
Count Primes	medium	-	adobe amazon apple
Contains Duplicate 1 - Check if array has duplicates	easy		adobe airbnb amazon
Count Complete Tree Nodes	easy	-	amazon bloomberg bytedance
Count Univalue Subtrees	medium	-	amazon bloomberg box
Count of Smaller Numbers After Self	hard	-	adobe amazon apple
Count of Range Sum	hard	-	google
Counting Bits	easy		amazon apple bloomberg
Subarray Product Less Than K	medium	-	akuna-capital atlassian coursera
Consecutive Numbers Sum	hard	-	citadel citrix indeed
Minimum Add to Make Parentheses Valid	medium		amazon facebook servicenow
Count Negative Numbers in a Sorted Matrix	easy	-	amazon
Delete Characters to Make Fancy String	easy
Count number of bits to be flipped to convert A to B	easy	-