Repeat | K5kC

Find duplicate number in array with 1 to N+1 numbers with one number repeating

Remove duplicates from Sorted Array 2

Majority Element - Boyer–Moore majority vote algorithm

Remove duplicates from Sorted List 1

Remove duplicates from Sorted Array 1

Single Number 3 - All elements except two occur twice

Remove duplicates from Sorted List 2

First Unique Character in a String

Remove duplicate characters in a string

Remove duplicates from an unsorted linked list keeping only one instance