Map

Given two strings `s` and `t`, return `true` if `t` is an anagram of `s`, and `false` otherwise.

Given a string `s`, find the first non-repeating character in it and return its index.

Given an array of `points` where `points[i] = [xi, yi]` represents a point on the **X-Y** plane, return the maximum number of points that lie on the same straight line.

two numbers such that they add up to target.