Advent of Code F# – Day 12

ps. look out for all my other solutions for Advent of Code challenges here.

 

Day 12

See details of the challenge here.

The input for today’s challenge looks like this:

cpy 1 a
cpy 1 b
cpy 26 d
jnz c 2
jnz 1 5
cpy 7 c

…

This is very similar to Day 23 of Advent of Code 2015 and looking at my solution then I thought I could simplify it slightly this time around.

 

Part 2

As you head down the fire escape to the monorail, you notice it didn’t start;
register c needs to be initialized to the position of the ignition key.

If you instead initialize register c to be 1, what value is now left in register a?

because of the work we did in part 1, part 2 is a simple one liner:

let part2 = (execute [ “c”, 1 ] inputs).[“a”]

 

Links

• Day 12 challenge description
• Advent of Code 2015
• Solution for Day 11
• Solution for 2015 Day 23
• All my F# solutions for Advent of Code
• Github repo