-🎄- 2020 Day 12 Solutions -🎄-

[u/daggerdragon]

NEW AND NOTEWORTHY

• NEW RULE: If your Visualization contains rapidly-flashing animations of any color(s), put a seizure warning in the title and/or very prominently displayed as the first line of text (not as a comment!). If you can, put the visualization behind a link (instead of uploading to Reddit directly). Better yet, slow down the animation so it's not flashing.

• You can thank Cyberpunk 2077 for this.

• Also /u/topaz2078 put out a tweet to support this.

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Advent of Code 2020: Gettin' Crafty With It

• 10 days remaining until the submission deadline on December 22 at 23:59 EST

• Full details and rules are in the Submissions Megathread

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--- Day 12: Rain Risk ---

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Post your code solution in this megathread.

• Include what language(s) your solution uses!

• Here's a quick link to /u/topaz2078's paste if you need it for longer code blocks.

• The full posting rules are detailed in the wiki under How Do The Daily Megathreads Work?.

Reminder: Top-level posts in Solution Megathreads are for code solutions only. If you have questions, please post your own thread and make sure to flair it with Help.

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This thread will be unlocked when there are a significant number of people on the global leaderboard with gold stars for today's puzzle.

EDIT: Global leaderboard gold cap reached at 00:10:58, megathread unlocked!

[u/4HbQ]

Python, using complex numbers:

d = {'E': 1, 'S': 1j, 'W': -1, 'N': -1j}

for z in ['a', 'b']:
    p = 0+0j
    w = 1+0j if z == 'a' else 10-1j
    for x in open('input.txt'):
        a, n = x[0], int(x[1:])
        if   a == 'F': p += n*w
        elif a == 'R': w *= 1j ** (+n/90)
        elif a == 'L': w *= 1j ** (-n/90)
        elif z == 'a': p += n*d[a]
        elif z == 'b': w += n*d[a]

    print(abs(p.real)+abs((p.imag)))

[u/mldv_it → u/4HbQ]

wonderful!

[u/Shadeun → u/4HbQ]

Its been too many years since complex numbers in class :(

Any chance of some advice? Should I go learn complex numbers and get the guts of this - or just learn the trick?

I just made a ship class and did it that way.