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Return the string after making it good. The answer is guaranteed to be unique under the given constraints.

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

Given two sorted arrays, return the median of the two sorted arrays.

Given a valid parentheses string represented as string s, return the nesting depth of s.

You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order, and each of their nodes contains a single digit. Add the two numbers and return the sum as a linked list

Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target.