--- Day 2: Dive! ---
Now, you need to figure out how to pilot this thing.
It seems like the submarine can take a series of commands like
down 2, or
forward Xincreases the horizontal position by
down Xincreases the depth by
up Xdecreases the depth by
Note that since you're on a submarine,
up affect your depth, and so they have the opposite result of what you might expect.
The submarine seems to already have a planned course (your puzzle input). You should probably figure out where it's going. For example:
forward 5 down 5 forward 8 up 3 down 8 forward 2
Your horizontal position and depth both start at
0. The steps above would then modify them as follows:
5to your horizontal position, a total of
5to your depth, resulting in a value of
8to your horizontal position, a total of
up 3decreases your depth by
3, resulting in a value of
8to your depth, resulting in a value of
2to your horizontal position, a total of
After following these instructions, you would have a horizontal position of
15 and a depth of
10. (Multiplying these together produces
Calculate the horizontal position and depth you would have after following the planned course. What do you get if you multiply your final horizontal position by your final depth?