15th 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 - 15th December 2020

A game is played a number of rounds. The game goes as follows: The subsequent number is the number of rounds since the currentNumber occurred last.

  1. Last number after 2020 rounds.

  2. Last number after 30_000_000 rounds.

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

The startingNumbers variable is an array of numbers given to each member by Advent of Code, which is individual for each user.

The solutions only differ in the roundEnd variable. Here are the solutions:

Overview of all solutions of 2020:

Advent of Code 2020 Solutions Overview