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

Rearrange array to alternate positive and negative elements

Wiggle Sort 1

Remove duplicates from Sorted Array 2

Find first and last positions of target element in sorted array

Search in Rotated Sorted Array

Majority Element - Boyer–Moore majority vote algorithm

Single Number 1 - All elements except one occur twice

Remove duplicates from Sorted List 1

Check if given string is palindrome or not

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