There are various reasons for owning a personal blog, such as, creating a personal online brand, sharing your knowledge, refining your writing skills to name a few.

Given an array of non-negative integers, you are initially positioned at the first index of the array.

Given a string, find the length of the longest substring without repeating characters.

Suppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand. (i.e., [0,1,2,4,5,6,7] might become [4,5,6,7,0,1,2]).

Given a linked list, remove the n-th node from the end of list and return its head.