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Array (174)Sorting (45)Depth First Search (44)Tree (41)Breadth First Search (35)Linked List (28)Stack (27)Recursion (18)Graph Theory (12)Monotonic Stack (8)Queue (6)Shortest Path (2)

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Title	Difficulty	Videos	Companies
Sum of Pairwise Hamming Distances	medium	-	google
Sum of two numbers using only bitwise operators	medium
Sum of Variable Length Subarrays	easy	-
Swap alternate nodes in a singly linked list	medium	-
Swap bits at position i and j	easy	-
Swap Every Kth Node in a LinkedList	medium	-
Swap Nibbles in a Byte	easy	-
Swap odd and even bits in an integer	medium	-	cisco
Swap two number in place without temporary variables	medium	-
Symmetric N-ary Tree Detection	easy	-	amazon
Team Dominance by Pass Success	hard	-
Ternary Search Tree Implementation	easy	-	zillow
Tetranacci Numbers	easy	-
Three-Word Additive Cryptarithmetic Solver	medium	-	google
Toggle a specified bit in a bit string without effecting other bits	easy	-
Toggle the n-th bit	easy	-
Total sum excluding adjacent of a given node in BST	medium	-
Tower of Hanoi	medium
Transform Array by Parity	easy	-
Transformations Between Binary Tree Structuctures and Linked Lists	medium	-
Transformed Array	easy	-
Transitive Closure of a Graph	easy	-	microsoft
Traveling Salesman Problem	hard	-
Trough index in a Valley array	medium	-
Turn off the rightmost 1-bit	easy	-
Turn off the rightmost contiguous string of 1’s	medium	-
Turn on the rightmost 0-bit	easy	-
Turning a bit off without affecting other bits	easy	-
Twitter Codility Problem - Max Binary Gap	easy	-
Two Number Missing in Range 1 to N	medium	-
Unbounded Knapsack Problem	medium	-
Uniform Random Sampling of k Nodes in a Binary Tree	medium	-
Uniformly Shuffle Linked List Nodes	hard	-	apple
Unique 3-Digit Even Numbers	easy	-
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 - Get all paths moving right or down with obstacles	medium	-
Unique Paths in Grid 1-2 - Get all paths moving right or down	medium	-
Unique Paths in Grid 2-3 - Get all paths moving in 4 directions with obstacles	medium	-
Unique Paths in Grid without crossing main diagonal	medium	-
Unit Conversion I	medium	-
Unit Conversion II	medium	-
URL Query Strings	medium	-
URL Structure	medium	-
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
Swap Nodes in Pairs	medium	-	adobe amazon apple
K Reverse a linked list	hard	-	adobe amazon apple

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