5th 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 - 5th December 2020

Pretend you are one a plane where the seat ids are seatRow * 8 + seatColumn and the seat row and column are encoded the following way: BBFFBBFRLL where the first 8 character are binary notation for the row and the last 3 binary notation for the column. "B" and "R" maps to 1 whereas "F" and "L" map to 0 in the binary notation,

  1. Find highest seat id.

  2. Find missing seatId.

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

The lines variable is an array of strings containing the encoded seat position given by Advent of Code, which is individual for each user.

Here is the solution:

Overview of all solutions of 2020:

Advent of Code 2020 Solutions Overview