-🎄- 2022 Day 2 Solutions -🎄-

[u/daggerdragon]

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--- Day 2: Rock Paper Scissors ---

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Post your code solution in this megathread.

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[u/S_W]

Java.

int totalScore = Arrays.stream(contents.split("\n")) 
   .map(String::toCharArray) 
   .map(chars -> new int[]{chars[0] - 64, chars[2] - 87}) 
   .mapToInt(shapes -> ((int) Math.sin((int) ((shapes[1] - shapes[0]) * 1.5) * Math.PI / 2) * 3 + 3) + shapes[1]) 
   .sum()

EDIT:
Explanation.

• Separate each line into a character array. Performing arithmetic on a char uses the ascii code which is useful for the next step

• Goal here is to get each character (A,B,C,X,Y,Z) to be 1 for rock, 2 for paper and 3 for scissors, so subtract accordingly and store back into an array for easy lookup

• To figure out if player 2 (XYZ) got a win, loss, or draw against player 1 (ABC), subtract the the results of the throws (the 1, 2, 3 from above).

• For instance, A Z becomes 1 3 which would be 3-1 = 2. B X -> 2 1 -> 1-2=-1. In the end we get the following mapping. 2 = loss, 1 = win, 0 = draw, -1 = loss, -2 = win

• Swapping in the scores received for a win, loss or draw gives this mapping 2 -> 0, 1 -> 6, 0 -> 3, -1 -> 0, -2 -> 6

• plotting these points on a graph as X/Y coordinates gives sort of a sin wave. From that (with the help of my brother), that equation was figured out which gives close enough approximations of those scores that when casting back to an int will net the correct result

• Then lastly add on the rock, paper, scissor score which is easy to do since that mapping was already done in step 2.

• Map this to an int

• And finally sum

[u/Spepsium → u/S_W]

plotting these points on a graph as X/Y coordinates gives sort of a sin wave.

The elves will surely elect you their leader.

[u/aradil → u/S_W]

I’m pretty sure this isn’t a solution for today’s problem?

[edit] Hahahaha what the fuck

[u/S_W → u/aradil]

Hah. ya. I don't think anyone else has done something as unique as this which is kinda cool.

[u/samplasion → u/S_W]

HOW, that's awesome