47 lines
1.3 KiB
Text
47 lines
1.3 KiB
Text
Day 12 Notes
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+--------+
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| Part 1 |
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+--------+
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$ elixir day12part1.exs
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923
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Thoughts:
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This was pretty fun :-)
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I spent ages fixing stupid typos and didn't realise I'd forgotten to take account for the fact that
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a rotation command could contain more than 90 degrees. I submitted so many wrong answers I had to
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wait 3 minutes to submit the correct one... oops.
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Decided to store the direction as an {x, y} vector, and handle rotations as just flipping the
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values as required. Use recursion to do it repetedly for rotations of more than 90 degrees.
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NSEW operations are just simply adjusting the coordinates as required.
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For F, apply the vector to the boat's current position.
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+--------+
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| Part 2 |
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+--------+
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$ elixir day12part2.exs
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24769
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Thoughts:
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Interesting. The fact that the waypoint moves when the boat moves makes this part very simple.
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Thankfully I stored the rotation as a vector in part 1, which is basically the waypoint
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fixed at a distance of 1. So for this part, can just adjust the NSEW commands to move the
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waypoint/vector instead of the boat.
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The rest of the commands are the same.
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+------------------+
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| Overall Thoughts |
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+------------------+
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I liked this one. Figuring out how to do the rotation efficiently probably took the most time,
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but I'm pretty happy with the results 😊
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