Given the head of a singly linked list, return the middle node of the linked list.

Given a string s, reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order.

Given an array, rotate the array to the right by k steps, where k is non-negative.

Given a 1-indexed array of integers numbers that is already sorted in non-decreasing order, find two numbers such that they add up to a specific target number. ...

Given an integer array nums, move all 0's to the end of it while maintaining the relative order of the non-zero elements.

Given an integer array nums sorted in non-decreasing order, return an array of the squares of each number sorted in non-decreasing order.

Given an array of integers nums which is sorted in ascending order, and an integer target, write a function to search target in nums. If target exists, then ret...

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