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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
Remove duplicate in Binary Search Tree BST	medium	-
Remove duplicates from an unsorted linked list keeping only one instance	easy	-
Remove duplicates from unsorted array	easy	-
Replace all occurrences of a pattern in a text by another string	medium	-
Replace all spaces in c-style string with '%20'	medium	-
Replace each node in BST with subtree sum and its value	medium	-
Reschedule Meetings for Maximum Free Time I	medium	-
Reschedule Meetings for Maximum Free Time II	medium	-
Reservoir Sampling Explained	medium	-	facebook
Return all diagonals of a rectangular two-dimensional matrix	medium	-
Return two prime numbers that sum to a given even number	easy	-	alibaba
Reverse a directed graph	medium	-	yahoo
Reverse a Doubly Linked List	medium	-
Reverse a stack in place using recursion	medium	-
Reverse Degree of a String	easy	-
Reverse the given Array without using built in function	easy	-
Reverse words in a string keep delimiters in order	hard	-
Right propagate the rightmost 1-bit	easy	-
Right side view of a tree	medium	-
Rod Cutting Problem	medium	-
Roman numerals	medium	-
Rotate an Array to Left	medium	-	facebook
Rotting Oranges	medium	-
Row with maximum number of 1s in sorted binary matrix	medium	-
Run a Markov chain and count state visits	easy	-	google
Run-length Encoding	easy	-	amazon
Scheduling to minimize lateness	easy	-
Search a long string for small strings in an array	hard	-
Search for Target in Bitonic Array	medium	-
Search in Rotated Sorted Array - Duplicates Allowed	medium	-
Search target in nearly sorted array	medium	-
Search Word in Root-to-Leaf Word Tree	easy	-
Searching in a sorted array of strings with empty strings	medium	-
Second largest element in binary search tree	medium	-	dropbox
Select a Random Node from a Binary Tree with Equal Probability	medium	-
Select a random number from stream	medium	-
Select K Disjoint Special Substrings	medium	-
Sentence Validation Stream Processor	medium	-	Nest
Separate Squares I	medium	-
Separate Squares II	hard	-
Set all bits of a number in a range equal to another number	medium	-
Set the n-th bit	easy	-
Shortest Matching Substring	hard	-
Shortest Path in a Weighted Tree	hard	-
Shortest path in Binary Search Tree that adds up to a given value	medium	-
Shortest substring containing all characters in a set	medium	-	square
Shortest Unique Prefix	medium	-	google square
Shortest Uphill-Downhill Route for a Competitive Runner	medium	-	square
Sieve of Eratosthenes Algorithm	easy	-	square
Simulating an Unbiased Coin Toss Using a Biased Coin	medium	-	square

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