21th December solution - Advent of Code 2020 - swift

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As part of Advent of Code (adventofcode.com) each day there are two programming tasks to be solved. All solutions are listed here.

I am writing the solutions in Swift with the Playground environment in xCode.

Tasks - 21th December 2020

  1. Find number of ingredients not containing any allergies.

  2. Match ingredient name to allergies and display them in alphabetical order.

For a more detailed description of the tasks check this out.

The lines variable is an array of lines in the txt files given to each member by Advent of Code, which is individual for each user.

Here are the solutions:

Overview of all solutions of 2020:

Advent of Code 2020 Solutions Overview