You're given the costs of candies and a discount: for every three candies you buy, the cheapest one is free. Find the minimum total cost to buy all the candies.

Determine if two strings are anagrams of each other, meaning they contain the same characters in a different order. You need to check if one string can be rearranged to form the other.

Determine if a given array of positive integers is considered "good". An array is "good" if you can obtain 1 by taking the greatest common divisor (GCD) of all the numbers in a subsequence of the array.