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25 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
Contains Duplicate 4 - Check if array contains duplicates given ranged array	easy	-
Find duplicate number in array with 1 to N+1 numbers with one number repeating	easy	-
Find duplicates in a given array	easy	-
Find duplicates in an array of integers within range 0 to n-1	medium	-
Find first duplicate number in an array containing numbers from 1 to n	medium	-
Find most frequent element in the array	easy	-
Find two repeating elements in a given ranged array	medium	-
Finding the most frequent element in an array of numbers from 0 to n-1	medium	-
First Unique element in an array	easy	-
Number of unique elements in sorted array with repeated elements	easy	-
Remove duplicate characters in a string	medium	-
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	-
Remove duplicates from Sorted Array 1	easy		adobe amazon apple
Remove duplicates from Sorted Array 2	medium	-	amazon facebook google
Remove duplicates from Sorted List 2	medium		adobe amazon apple
Remove duplicates from Sorted List 1	easy		adobe amazon apple
Single Number 2 - All elements except one occur thrice	medium	-	adobe amazon facebook
Majority Element - Boyer–Moore majority vote algorithm	easy	-	adobe amazon apple
Majority Element 1 - with n by 2 definition	easy	-	facebook google microsoft
Majority Element 2 - With n by 3 definition	medium	-	adobe amazon apple
Single Number 3 - All elements except two occur twice	medium	-	amazon apple facebook
Find Duplicate Number in array containing n+1 numbers between 1 and n	medium	-	adobe amazon apple
First Unique Character in a String	easy	-	adobe amazon apple