Day 2: Rock Paper Scissors

#!/usr/bin/env pypy3

import sys

def main():
    score = 0
    for line in sys.stdin:
        rnd = line.split()
        opp = ord(rnd[0]) - ord('A')    # ascii
        me = ord(rnd[1]) - ord('X')     # haxx!
        score += me + 1 + ((me - opp + 1) % 3) * 3

    print(score)

if __name__ == '__main__':
    main()

#!/usr/bin/env pypy3

import sys

def main():
    score = 0
    for line in sys.stdin:
        rnd = line.split()
        opp = ord(rnd[0]) - ord('A')                    # ascii
        me = (ord(rnd[1]) - ord('X') - 1 + opp) % 3     # haxx!
        score += me + 1 + ((me - opp + 1) % 3) * 3

    print(score)

if __name__ == '__main__':
    main()

I combined the points from the get go and added onto the array for the second part. No use writing it out twice... or thrice, I guess.

=ARRAYFORMULA(
  BYCOL(
   IFERROR(
    VLOOKUP(
     A2:A, 
     {"B Z",9,9;
      "A Y",8,4;
      "C X",7,2;
      "C Z",6,7;
      "B Y",5,5;
      "A X",4,3; 
      "A Z",3,8;
      "C Y",2,6;
      "B X",1,1},
     {2,3},0)),
   LAMBDA(x,SUM(x))))

#!/usr/bin/awk -f
BEGIN {
        shape["A"] = 1
        shape["B"] = 2
        shape["C"] = 3
        shape["X"] = 1
        shape["Y"] = 2
        shape["Z"] = 3

        outcome[0] = 3
        outcome[1] = 6
        outcome[2] = 0
}

{ score += outcome[((shape[$2]-shape[$1])+3)%3] + shape[$2] }

END { print(score) }

#!/usr/bin/awk -f
BEGIN {
        shape["A"] = 1
        shape["B"] = 2
        shape["C"] = 3
}

{
        if ($2 == "X")
                score += ((shape[$1]-1)+2) % 3 + 1
        else if ($2 == "Y")
                score += shape[$1] + 3
        else if ($2 == "Z")
                score += ((shape[$1]) % 3) + 6 + 1
}

END { print(score) }

by_selected: int = 0
by_outcome: int = 0

selected = {
    "X": 1,
    "Y": 2,
    "Z": 3,
}

outcome = {
    "A": [3, 6, 0],
    "B": [0, 3, 6],
    "C": [6, 0, 3],
}

with open("input.txt") as file:
    for line in file:
        elf, me = line.split()
        by_selected += selected[me] + outcome[elf][selected[me] - 1]
        result = (selected[me] - 1) * 3
        by_outcome += result + outcome[elf].index(result) + 1

print(by_selected)  # Part One: 10941
print(by_outcome)  # Part Two: 13071

with open('./02/input.txt', 'r') as f:
    strategy_guide = f.readlines()

# Opponent Move: Row, Player Move: Column
#           Rock    Paper   Scissor
# Rock      3
# Paper             3
# Scissor                       3
outcome_matrix = [
    [3, 6, 0],
    [0, 3, 6],
    [6, 0, 3]
]

shape_reward = [1, 2, 3]

LUT_RPS_1 = {
    'A': 0,
    'B': 1,
    'C': 2,
    'X': 0,
    'Y': 1,
    'Z': 2
}

def reward_function(game_str: str) -> int:
    opponent, player = game_str.replace("\n", "").split(" ")
    opponent_play = LUT_RPS_1[opponent]
    player_play = LUT_RPS_1[player]

    outcome = outcome_matrix[opponent_play][player_play]
    shape_bonus = shape_reward[player_play]

    score = outcome + shape_bonus

    return score

scores = [reward_function(game_str) for game_str in strategy_guide]
total_score = sum(scores)
print(f"Total score for Part 1: {total_score}")

LUT_outcome = {
    'X': 0,
    'Y': 3,
    'Z': 6
}

def find_player_shape_score(opponent, outcome) -> int:
    opponent_play = LUT_RPS_1[opponent]
    desired_outcome = LUT_outcome[outcome]

    player_shape_idx = outcome_matrix[opponent_play].index(desired_outcome)  #CPU cycles are cheap, my time is not
    shape_bonus = shape_reward[player_shape_idx]
    return shape_bonus


def reward_function_2(game_str: str) -> int:
    opponent, outcome = game_str.replace("\n", "").split(" ")
    outcome_score = LUT_outcome[outcome]
    shape_score = find_player_shape_score(opponent, outcome)
    score = outcome_score + shape_score
    return score

scores_2 = [reward_function_2(game_str) for game_str in strategy_guide]
total_score_2 = sum(scores_2)
print(f"Total score for Part 2: {total_score_2}")

choices = {
	'A': 'rock',
	'X': 'rock',
	'B': 'paper',
	'Y': 'paper',
	'C': 'scissors',
	'Z': 'scissors',
}

# map of (their move, my move) -> my result
# win (True), draw (None), or lose (False)
results = {
	('rock', 'rock'): None,
	('rock', 'paper'): True,
	('rock', 'scissors'): False,

	('paper', 'rock'): False,
	('paper', 'paper'): None,
	('paper', 'scissors'): True,

	('scissors', 'rock'): True,
	('scissors', 'paper'): False,
	('scissors', 'scissors'): None,
}

scores = {
	'rock': 1,
	'paper': 2,
	'scissors': 3,
}

with open('02.txt') as input_file:
	lines = input_file.readlines()

total_score = 0

for line in lines:
	p1, p2 = line.strip().split(' ')
	their_move, my_move = choices[p1], choices[p2]
	my_result = results[(their_move, my_move)]

	if my_result is None:
		total_score += 3
	elif my_result is True:
		total_score += 6

	total_score += scores[my_move]

print(total_score)

choices = {
	'A': 'rock',
	'B': 'paper',
	'C': 'scissors',
}

goals = {
	'X': 'lose',
	'Y': 'draw',
	'Z': 'win',
}

# map of (their move, my goal) -> my move
moves = {
	('rock', 'lose'): 'scissors',
	('rock', 'win'): 'paper',
	('rock', 'draw'): 'rock',

	('paper', 'lose'): 'rock',
	('paper', 'win'): 'scissors',
	('paper', 'draw'): 'paper',

	('scissors', 'lose'): 'paper',
	('scissors', 'win'): 'rock',
	('scissors', 'draw'): 'scissors',
}

scores = {
	'rock': 1,
	'paper': 2,
	'scissors': 3,
}

with open('02.txt') as input_file:
	lines = input_file.readlines()

total_score = 0

for line in lines:
	p1, p2 = line.strip().split(' ')
	their_move, my_goal = choices[p1], goals[p2]
	my_move = moves[(their_move, my_goal)]

	if my_goal == 'win':
		total_score += 6
	elif my_goal == 'draw':
		total_score += 3

	total_score += scores[my_move]

print(total_score)

(define (part-01 input)
  (for/sum ([choices (in-list input)])
    (match-define (list (app shape elf)
                        (app shape self)) (string-split choices))
    (game-score elf self)))

(define (shape token)
  (case token
    [("A" "X") 'rock]
    [("B" "Y") 'paper]
    [("C" "Z") 'scissors]))

(define (game-score elf self)
  ;; yes, I confused myself by mixing up the order of the tokens and had to waste time debugging.  
  (+ (shape-score self)
     (match* (elf self)
       [(same      same)      3]
       [('scissors 'rock)     6]
       [('rock     'paper)    6]
       [('paper    'scissors) 6]
       [(_ _)                 0])))

(define (shape-score shape)
  (case shape
    [(rock)     1]
    [(paper)    2]
    [(scissors) 3]))  

(define (part-02 input)
  (for/sum ([choices (in-list input)])
    (match-define (list (app shape elf)
                        (app shape self)) (string-split choices))
    (outcome-score elf self)))

(define (outcome-score elf self)
  (case self
    [(rock)     (+ 0 (shape-score (lose elf)))]
    [(paper)    (+ 3 (shape-score       elf))]
    [(scissors) (+ 6 (shape-score (win  elf)))]))

(define (lose elf)
  (case elf
    [(rock)     'scissors]
    [(scissors) 'paper]
    [(paper)    'rock]))

(define (win elf)
  (case elf
    [(rock)     'paper]
    [(scissors) 'rock]
    [(paper)    'scissors]))

Attempt 1:

(with-input-from-file "day02.input"
  (thunk
   (for/fold ([part1 0]
              [part2 0]
              #:result (list part1 part2))
             ([choices (in-lines)])
     (values (+ part1
                (case choices
                  [("A X") 4] [("A Y") 8] [("A Z") 3]
                  [("B X") 1] [("B Y") 5] [("B Z") 9]
                  [("C X") 7] [("C Y") 2] [("C Z") 6]))
             (+ part2
                (case choices
                  [("A X") 3] [("A Y") 4] [("A Z") 8]
                  [("B X") 1] [("B Y") 5] [("B Z") 9]
                  [("C X") 2] [("C Y") 6] [("C Z") 7]))))))

Attempt 2 (aka throw memory at it):

(with-input-from-file "day02.input"
   (thunk
    (define outcomes
      (make-immutable-hash
       '(("A X" . (4 3)) ("A Y" . (8 4)) ("A Z" . (3 8))
         ("B X" . (1 1)) ("B Y" . (5 5)) ("B Z" . (9 9))
         ("C X" . (7 2)) ("C Y" . (2 6)) ("C Z" . (6 7)))))
    (for/fold ([part1 0]
               [part2 0]
               #:result (list part1 part2))
              ([choices (in-lines)])
      (define scores (hash-ref outcomes choices))
      (values (+ part1 (first scores))
              (+ part2 (second scores))))))

OUTCOMES = {
  'A X' => [4, 3],
  'A Y' => [8, 4],
  'A Z' => [3, 8],
  'B X' => [1, 1],
  'B Y' => [5, 5],
  'B Z' => [9, 9],
  'C X' => [7, 2],
  'C Y' => [2, 6],
  'C Z' => [6, 7]
}

rows = File
     .read("input.txt")
     .split("\n")
     .map(&OUTCOMES)
     
p rows.sum(&:first) # Part 1
p rows.sum(&:last) # Part 2

public static void dayTwoPartOne() throws IOException {
        System.out.println(Files.readAllLines(Path.of("input-day2.txt"))
            .stream()
            .mapToInt(s-> ((int)s.charAt(2) - 87) + switch(((int)s.charAt(2) - 88) - ((int)s.charAt(0) - 65)){
                case -2 -> 6;
                case -1 -> 0;
                case 0 -> 3;
                case 1 -> 6;
                case 2 -> 0;
                default -> throw new IllegalArgumentException();
            }
        ).sum());
    }

public static void dayTwoPartTwo() throws IOException {
        System.out.println(Files.readAllLines(Path.of("input-day2.txt"))
            .stream()
            .mapToInt(s-> switch((int)s.charAt(2) - 88){
                case 0 ->  0 + ((int)s.charAt(0) - 63)%3 + 1;
                case 1 -> 3 + (int)s.charAt(0) - 64;
                case 2 ->  6 + ((int)s.charAt(0) - 64)%3 + 1;
                default -> throw new IllegalArgumentException();
            }
        ).sum());
    }

#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub enum Play {
    Rock = 1,
    Paper = 2,
    Scissors = 3,
}

#[derive(Debug, PartialEq, Eq)]
pub struct Strategy {
    pub elf: Play,
    pub you: Play,
}

pub fn calc_score(input: &Strategy) -> usize{
    //play enum has value corresponding to its score.
    let mut score = input.you as usize;
    //an enum wins if (you-elf)%3 = 1, looses if it = 2
    let gamestatus = (input.you as i8 - input.elf as i8).rem_euclid(3);
    match gamestatus {
        1 => score+=6,
        2 => (),
        0 => score += 3,
        _ => panic!("gamestatus was {}!, you were {}, elf was {}", gamestatus, input.you as i8, input.elf as i8)
    }
    score
}

mod part1;
mod part2;
mod utilities;

fn main() {
    let _input = include_str!("./input.txt");

    println!("Part One");
    println!("Result: {}", part1::part1(_input));

    println!("Part Two");
    println!("Result: {}", part2::part2(_input));
}

use crate::utilities::*;
pub fn part1(input: &str) -> usize {
    parse(input).iter().map(calc_score).sum()
}

pub fn parse(input: &str) -> Vec<Strategy> {
    input
        .lines()
        .map(|line| {
            let elf = match line.as_bytes()[0] {
                b'A' => Play::Rock,
                b'B' => Play::Paper,
                b'C' => Play::Scissors,
                _ => panic!("your opponent not playing defined strategy!"),
            };
            let you = match line.as_bytes()[2] {
                b'X' => Play::Rock,
                b'Y' => Play::Paper,
                b'Z' => Play::Scissors,
                _ => panic!("you are not playing defined strategy!"),
            };
            Strategy { elf, you }
        })
        .collect()
}

use crate::utilities::*;

pub enum GameResult {
    Win,
    Loss,
    Draw,
}

pub struct ResultStrategy {
    pub elf: Play,
    pub you: GameResult,
}

pub fn part2(input: &str) -> usize {
    parse(input)
        .iter()
        .map(gen_strategy)
        .map(|strat| calc_score(&strat))
        .sum()
}

fn gen_strategy(input: &ResultStrategy) -> Strategy {
    match input.you {
        GameResult::Win => Strategy {
            elf: input.elf,
            you: gen_win(input.elf),
        },
        GameResult::Draw => Strategy {
            elf: input.elf,
            you: input.elf,
        },
        GameResult::Loss => Strategy {
            elf: input.elf,
            you: gen_loss(input.elf),
        },
    }
}

fn gen_win(opponent: Play) -> Play {
    match opponent {
        Play::Rock => Play::Paper,
        Play::Paper => Play::Scissors,
        Play::Scissors => Play::Rock,
    }
}

fn gen_loss(opponent: Play) -> Play {
    match opponent {
        Play::Rock => Play::Scissors,
        Play::Paper => Play::Rock,
        Play::Scissors => Play::Paper,
    }
}

pub fn parse(input: &str) -> Vec<ResultStrategy> {
    input
        .lines()
        .map(|line| {
            let elf = match line.as_bytes()[0] {
                b'A' => Play::Rock,
                b'B' => Play::Paper,
                b'C' => Play::Scissors,
                _ => panic!("your opponent not playing defined strategy!"),
            };
            let you = match line.as_bytes()[2] {
                b'X' => GameResult::Loss,
                b'Y' => GameResult::Draw,
                b'Z' => GameResult::Win,
                _ => panic!("you are not playing defined strategy!"),
            };
            ResultStrategy { elf, you }
        })
        .collect()
}

import std/strutils

type
  RockPaperScissorsMove = enum
    rpsmInvalid = 0, rpsmRock = 1, rpsmPaper = 2, rpsmScissors = 3
  RockPaperScissorsOutcome = enum
    rpsoLoss = 0, rpsoDraw = 3, rpsoWin = 6, rpsoInvalid

proc calcScoreP1(myMove, theirMove: RockPaperScissorsMove): int {.inline.} = 
  if myMove == rpsmRock:
    if theirMove == rpsmRock:
      return int(rpsoDraw) + int(myMove)
    if theirMove == rpsmScissors:
      return int(rpsoWin) + int(myMove)
    if theirMove == rpsmPaper:
      return int(rpsoLoss) + int(myMove)

  if myMove == rpsmPaper:
    if theirMove == rpsmPaper:
      return int(rpsoDraw) + int(myMove)
    if theirMove == rpsmRock:
      return int(rpsoWin) + int(myMove)
    if theirMove == rpsmScissors:
      return int(rpsoLoss) + int(myMove)

  if myMove == rpsmScissors:
    if theirMove == rpsmScissors:
      return int(rpsoDraw) + int(myMove)
    if theirMove == rpsmPaper:
      return int(rpsoWin) + int(myMove)
    if theirMove == rpsmRock:
      return int(rpsoLoss) + int(myMove)

  return 0

proc calcScoreP2(theirMove: RockPaperScissorsMove, desiredOutcome: RockPaperScissorsOutcome): int {.inline.} =
  if desiredOutcome == rpsoLoss:
    if theirMove == rpsmRock:
      return int(rpsoLoss) + int(rpsmScissors)
    if theirMove == rpsmPaper:
      return int(rpsoLoss) + int(rpsmRock)
    if theirMove == rpsmScissors:
      return int(rpsoLoss) + int(rpsmPaper)

  if desiredOutcome == rpsoDraw:
    if theirMove == rpsmRock:
      return int(rpsoDraw) + int(rpsmRock)
    if theirMove == rpsmPaper:
      return int(rpsoDraw) + int(rpsmPaper)
    if theirMove == rpsmScissors:
      return int(rpsoDraw) + int(rpsmScissors)

  if desiredOutcome == rpsoWin:
    if theirMove == rpsmRock:
      return int(rpsoWin) + int(rpsmPaper)
    if theirMove == rpsmPaper:
      return int(rpsoWin) + int(rpsmScissors)
    if theirMove == rpsmScissors:
      return int(rpsoWin) + int(rpsmRock)

  return 0

proc day02*() = 
  var 
    scoreP1 = 0
    scoreP2 = 0

  # Assumes the input is in the correct format
  for line in lines("inputs/day02.in"):
    let moves = line.splitWhitespace()
    let theirMove: RockPaperScissorsMove = case moves[0]:
      of "A":
        rpsmRock
      of "B":
        rpsmPaper
      of "C":
        rpsmScissors
      else:
        rpsmInvalid

    let myMove: RockPaperScissorsMove = case moves[1]:
      of "X":
        rpsmRock
      of "Y":
        rpsmPaper
      of "Z":
        rpsmScissors
      else:
        rpsmInvalid

    let desiredOutcome: RockPaperScissorsOutcome = case moves[1]:
      of "X":
        rpsoLoss
      of "Y":
        rpsoDraw
      of "Z":
        rpsoWin
      else:
        rpsoInvalid
    
    scoreP1 += calcScoreP1(myMove, theirMove)
    scoreP2 += calcScoreP2(theirMove, desiredOutcome)
  
  echo("Part 1: " & $scoreP1)
  echo("Part 2: " & $scoreP2)

#!/usr/bin/env bash

file=day2.dat
part=2

if [[ ${part} -eq 1 ]]; then
# /////////////////////////////////////////////////////////////////////////////
#part 1 0.13s

score=0
urPick=0
opPick=0
#   -- read file, check outcome
while read -r line || [[ -n "${line}" ]]; do

#   -- get points for just picking something
    if [[ "{$line:3:1}" =~ "X" ]]; then
        urPick=1
    elif [[ "{$line:3:1}" =~ "Y" ]]; then
        urPick=2
    else
        urPick=3
    fi

#   -- winning plays
#   -- rock (X) beats scissors (C), paper (Y) beats rock (A), scissors (Z) beat paper (B) | rock = 1 pt, paper = 2, scissors =3
    if [[ "${line}" =~ "C X" || "${line}" =~ "A Y" || "${line}" =~ "B Z" ]]; then
        (( score = score + 6 + urPick ))
    elif [[ "${line}" =~ "A X" || "${line}" =~ "B Y" || "${line}" =~ "C Z" || "${line}" =~ "Z C" || "${line}" =~ "Y B" || "${line}" =~ "X A" ]]; then
        (( score = score + urPick + 3 ))
    else
        (( score = score + urPick ))
    fi

done < ${file}

echo Part A $score
# /////////////////////////////////////////////////////////////////////////////
fi

if [[ ${part} -eq 2 ]]; then
# /////////////////////////////////////////////////////////////////////////////
#part 2 0.08s
score=0
outcome=0
opPick=0
#   -- read file, check outcome
while read -r line || [[ -n "${line}" ]]; do

#   -- get points for just picking something
    if [[ "{$line:3:1}" =~ "X" ]]; then
        outcome=1 
    elif [[ "{$line:3:1}" =~ "Y" ]]; then
        outcome=2
    else
        outcome=3
    fi

#   -- do whatever outcome is
    if [[ $outcome -eq 1 ]]; then #lose
        if [[ "{$line:1:1}" =~ "A" ]]; then
            urPick=3
        elif [[ "{$line:1:1}" =~ "B" ]]; then
            urPick=1
        else
            urPick=2
        fi
        (( score = score + urPick ))
    fi

    if [[ $outcome -eq 2 ]]; then #draw
        if [[ "{$line:1:1}" =~ "A" ]]; then
            urPick=1
        elif [[ "{$line:1:1}" =~ "B" ]]; then
            urPick=2
        else
            urPick=3
        fi
        (( score = score + urPick + 3 ))
    fi

    if [[ $outcome -eq 3 ]]; then #win
        if [[ "{$line:1:1}" =~ "A" ]]; then
            urPick=2
        elif [[ "{$line:1:1}" =~ "B" ]]; then
            urPick=3
        else
            urPick=1
        fi
        (( score = score + 6 + urPick ))
    fi

done < ${file}

echo Part B $score

# /////////////////////////////////////////////////////////////////////////////
fi

(defn line-result [line]
  (case (first line)
    \A (case (last line)
         \X (+ 1 3)
         \Y (+ 2 6)
         \Z (+ 3 0))
    \B (case (last line)
         \X (+ 1 0)
         \Y (+ 2 3)
         \Z (+ 3 6))
    \C (case (last line)
         \X (+ 1 6)
         \Y (+ 2 0)
         \Z (+ 3 3))))

(defn part-1 [input]
  (reduce + (map line-result input)))

(defn line-result-2 [line]
  (case (first line)
    \A (case (last line)
         \X (+ 3 0)
         \Y (+ 1 3)
         \Z (+ 2 6))
    \B (case (last line)
         \X (+ 1 0)
         \Y (+ 2 3)
         \Z (+ 3 6))
    \C (case (last line)
         \X (+ 2 0)
         \Y (+ 3 3)
         \Z (+ 1 6))))

(defn part-2 [input]
  (reduce + (map line-result-2 input)))

#!/usr/bin/python3

p1_options = ["A","B","C"]
p2_options = ["X","Y","Z"]

def get_option(choice,options):
    # convert letters to numbers
    return options.index(choice)

def rock_paper_scissors(p1,p2):
    score = 0
    # win
    if p1 - p2 == -1 or p1 - p2 == 2:
        score += 6 + (p2 + 1)
    # draw
    if p1 == p2:
        score += 3 + (p2 + 1)
    # lose
    if p1 - p2 == 1 or p1 - p2 == -2:
        score += 0 + (p2 + 1)

    return score

with open("input_proper_1") as input:
    total = 0
    for line in input:
        p1 = line.strip()[0]
        p1 = get_option(p1,p1_options)

        p2 = line.strip()[-1]
        p2 = get_option(p2,p2_options)

        total += rock_paper_scissors(p1,p2)

print(total)

#!/usr/bin/python3

p1_options = ["A","B","C"]
p2_options = ["X","Y","Z"]

def get_option(choice,options):
    # convert letters to numbers
    return options.index(choice)

def rock_paper_scissors(p1,p2):
    score = 0
    # win
    if p2 == 2:
        if p1 == 2:
            score += 6 + 1
        else:
            score += 6 + p1 + 2
    # draw
    if p2 == 1:
        score += 3 + (p1 + 1)
    # lose
    if p2 == 0:
        if p1 == 0:
            score += 3
        else:
            score += p1
    return score

with open("input_proper_1") as input:
    total = 0
    for line in input:
        p1 = line.strip()[0]
        p1 = get_option(p1,p1_options)

        p2 = line.strip()[-1]
        p2 = get_option(p2,p2_options)

        total += rock_paper_scissors(p1,p2)

print(total)

use std::env;
use std::io::{self, prelude::*, BufReader};
use std::fs::File;

#[derive(Debug,PartialEq,Eq)]
enum GameResult {
    Win = 6,
    Draw = 3,
    Lose = 0,
}
impl From<&str> for GameResult {
    fn from(c: &str) -> Self {
        match c {
            "X" => Self::Lose,
            "Y" => Self::Draw,
            "Z" => Self::Win,
            other => panic!("Unknown directive: {}",other),
        }
    }
}

#[derive(Copy,Clone,Debug,PartialEq,Eq)]
enum Play {
    Rock = 1,
    Paper = 2,
    Scissors = 3,
}
impl From<&str> for Play {
    fn from(c: &str) -> Self {
        match c {
            "A" | "X" => Self::Rock,
            "B" | "Y" => Self::Paper,
            "C" | "Z" => Self::Scissors,
            other => panic!("Unknown play: {}",other),
        }
    }
}

// plays: (their play, my play)
fn result(plays: &(Play,Play)) -> GameResult {
    use Play::*;
    use GameResult::*;
    match plays {
        (Rock,Rock) | (Paper,Paper) | (Scissors,Scissors) => { Draw }, 
        (Rock,Paper)     => { Win },
        (Rock,Scissors)  => { Lose },
        (Paper,Rock)     => { Lose },
        (Paper,Scissors) => { Win },
        (Scissors,Rock)  => { Win },
        (Scissors,Paper) => { Lose },
    }
}

fn play_from_result(their_play: Play, result: &GameResult) -> Play {
    use Play::*;
    use GameResult::*;
    match result {
        Draw => their_play,
        Win => {
            match their_play {
                Rock     => Paper,
                Paper    => Scissors,
                Scissors => Rock,
            }},
        Lose => {
            match their_play {
                Rock     => Scissors,
                Paper    => Rock,
                Scissors => Paper,
            }},
    }
}

fn plays(s: &String) -> (Play,Play) {
    let plays: Vec<_> = s.split_whitespace().collect();
    (Play::from(plays[0]), Play::from(plays[1]))
}

fn play_and_result(s: &String) -> (Play,GameResult) {
    let play_and_result: Vec<_> = s.split_whitespace().collect();
    (Play::from(play_and_result[0]), GameResult::from(play_and_result[1]))
}

fn solve(input: &str) -> io::Result<()> {
    let file = File::open(input).expect("Input file not found.");
    let reader = BufReader::new(file);

    // Input
    let input: Vec<String> = match reader.lines().collect() {
        Err(err) => panic!("Unknown error reading input: {}", err),
        Ok(result) => result,
    };

    // Part 1
    let part1 = input
        .iter()
        .map(|x| {
            let (their_play,my_play) = plays(x);
            let result = result(&(their_play,my_play));
            my_play as usize + result as usize
        })
        .sum::<usize>();
    println!("Part 1: {}", part1); // 11906

    // Part 2
    let part2 = input
        .iter()
        .map(|x| {
            let (play,result) = play_and_result(x);
            let my_play = play_from_result(play,&result);
            my_play as usize + result as usize
        })
        .sum::<usize>();
    println!("Part 2: {}", part2); //  11186

    Ok(())
}

fn main() {
    let args: Vec<String> = env::args().collect();
    let filename = &args[1];
    solve(&filename).unwrap();
}

using Lambda;
using StringTools;

enum Choice {
	Rock;
	Paper;
	Scissors;
}

enum Outcome {
	Lose;
	Draw;
	Win;
}

typedef Round = {
	var p1 : Choice;
	var p2 : Choice;
}

class Day2 {
	static public function run(input: String) {
		part1(input);
		part2(input);
	}

	static function part1(input: String) {
		var score = input
			.trim()
			.split("\n")
			.map(parseRoundPart1)
			.map(scoreRound)
			.fold((score, total) -> score + total, 0);

		Sys.println('day2 part1: ${score}');
	}

	static function part2(input: String) {
		var score = input
			.trim()
			.split("\n")
			.map(parseRoundPart2)
			.map(scoreRound)
			.fold((score, total) -> score + total, 0);

		Sys.println('day2 part2: ${score}');
	}

	static function parseRoundPart1(round: String): Round {
		var choices = round.split(" ");
		var round = {
			p1: parseChoice(choices[0]),
			p2: parseChoice(choices[1]),
		};

		return round;
	}

	static function parseChoice(choice: String): Choice {
		return switch (choice) {
			case "A" | "X":
				Rock;
			case "B" | "Y":
				Paper;
			case "C" | "Z":
				Scissors;
			default:
				Rock;
		}
	}

	static function scoreRound(round: Round): Int {
		return choiceScore(round.p2) + outcomeScore(round);
	}

	static function choiceScore(choice: Choice): Int {
		return switch (choice) {
			case Rock: 1;
			case Paper: 2;
			case Scissors: 3;
		};
	}

	static function outcomeScore(round: Round): Int {
		var p1Score = choiceScore(round.p1);
		var p2Score = choiceScore(round.p2);
		return if (p2Score == p1Score) {
			3;
		} else if (p2Score == p1Score + 1 || p2Score == p1Score - 2) {
			6;
		} else {
			0;
		};
	}

	static function parseRoundPart2(round: String): Round {
		var choices = round.split(" ");
		var p1Choice = parseChoice(choices[0]);
		var outcome = parseOutcome(choices[1]);
		var p2Choice = calculateChoice(p1Choice, outcome);
		var round = {
			p1: p1Choice,
			p2: p2Choice,
		};

		return round;
	}

	static function parseOutcome(outcome: String): Outcome {
		return switch (outcome) {
			case "X":
				Lose;
			case "Y":
				Draw;
			case "Z":
				Win;
			default:
				Lose;
		};
	}

	static function calculateChoice(p1Choice: Choice, outcome: Outcome): Choice {
		return switch [p1Choice, outcome] {
			case [Rock, Lose] | [Paper, Win] | [Scissors, Draw]: Scissors;
			case [Rock, Draw] | [Paper, Lose] | [Scissors, Win]: Rock;
			case [Rock, Win] | [Paper, Draw] | [Scissors, Lose]: Paper;
		};
	}
}

def part1(lines):
    score = 0
    values = {"X": 1, "Y": 2, "Z": 3}
    winner = {"A": "Y", "B": "Z", "C": "X"}
    tie = {"A": "X", "B": "Y", "C": "Z"}
    for line in lines:
        first, last = line.strip().split(' ')
        if last == winner[first]:
            score += 6
        elif last == tie[first]:
            score += 3
        score += values[last]
    print(f"Score: {score}")


def part2(lines):
    score = 0
    values = {"X": 1, "Y": 2, "Z": 3}
    winner = {"A": "Y", "B": "Z", "C": "X"}
    tie = {"A": "X", "B": "Y", "C": "Z"}
    loser = {"A": "Z", "B": "X", "C": "Y"}
    for line in lines:
        first, last = line.strip().split(' ')
        if last == 'Z':
            throw = winner[first]
            score += 6
            score += values[throw]
        elif last == 'Y':
            throw = tie[first]
            score += 3
            score += values[throw]
        else:
            throw = loser[first]
            score += values[throw]
    print(f"Score: {score}")



def openFile():
    return open("input.txt", "r").readlines()


def main():
    f = openFile()
    lines = part1(f)
    part2(f)


if __name__ == '__main__':
    main()

import * as fs from 'node:fs/promises';

function allEqual(array: string[]): boolean {
	return array.every(a => { if (a == array[0]) {
								return  true;
							} }
						);
};

function scoreRound_p1(round: string): number {
	const throws = round.replace("X","A")
						.replace("Y","B")
						.replace("Z","C");
	const winning_combos = ["A B", "B C", "C A"];
	const win_score: number = 6;
	const draw_score: number = 3;
	const lose_score: number = 0;
	const combos = throws.split(" ");
	// Throwing Rock is 1 point
	let throw_score: number = 1;

	// Throwing Paper gives 2, Scissors 3
	if (combos[combos.length-1] == "B") {
		throw_score += 1;
	} else if (combos[combos.length-1] == "C") {
		throw_score += 2;
	}

	if (winning_combos.includes(throws)) {
		throw_score += win_score;
	}
	else if (allEqual(combos)) {
		throw_score += draw_score;
	}
	else {
		throw_score += lose_score;
	}
	return throw_score;
};

function throwScore(enemy: string, goal: number): number {
	let score: number = 1;
	if (enemy == "A") {
		if (goal == 0) {
			score += 2;
		} else if (goal == 6) {
			score += 1;
		};
	} else if (enemy == "B"){
		if(goal == 6){
			score += 2;
		} else if (goal == 3) {
			score += 1;
		};
	} else {
		if(goal == 3) {
			score += 2;
		} else if (goal == 0) {
			score += 1;
		};
	};
	return score;
}
;

function scoreRound_p2(round: string): number {

	const win_score: number = 6;
	const draw_score: number = 3;
	const lose_score: number = 0;
	const combos = round.split(" ");
	let score: number = 0;

	if (combos[combos.length-1] == "X") {
		score += lose_score;
	} else if (combos[combos.length-1] == "Z") {
		score += win_score;
	} else {
		score += draw_score;
	}
	let total: number = throwScore(combos[0],score) + score;

	return total;
};

async function main(): Promise<void> {
	const file = await fs.readFile("input/day2","utf-8");
	let rounds = file.split("\n");
	
	//let scores: number[] = rounds.map( (round: string, index: number) => scoreRound_p1(round))
	let scores: number[] = rounds.map( (round: string, index: number) => scoreRound_p2(round))

	let total_score: number = scores.reduce((score: number, a: number) => score + a,0);
	console.log(total_score);
}

main();

scoring = {
    "A X": 4,
    "A Y": 8,
    "A Z": 3,
    "B X": 1,
    "B Y": 5,
    "B Z": 9,
    "C X": 7,
    "C Y": 2,
    "C Z": 6,
}

decoded_scoring = {
    "A X": 3,
    "A Y": 4,
    "A Z": 8,
    "B X": 1,
    "B Y": 5,
    "B Z": 9,
    "C X": 2,
    "C Y": 6,
    "C Z": 7,
}


def score_game(game: str, decoded: bool = False) -> int:
    return decoded_scoring[game] if decoded else scoring[game]


def main(filepath: str) -> Tuple[int, int]:

    games = load_file.load_cleaned_lines(filepath)
    return (
        sum([score_game(game) for game in games]),
        sum([score_game(game, True) for game in games]),
    )

And my new file loader that works in the way it probably should have from the beginning:

def load_cleaned_lines(filename: str) -> list[str]:
    with open(filename, "r") as fp:
        lines = fp.readlines()

    return [line.strip() for line in lines]

const POINTS_FOR_PLAYING_ROCK = 1;
const POINTS_FOR_PLAYING_PAPER = 2;
const POINTS_FOR_PLAYING_SCISSORS = 3;

const POINTS_FOR_VICTORY = 6;
const POINTS_FOR_DRAW = 3;
const POINTS_FOR_DEFEAT = 0;

const OPPONENT_CHOOSES_ROCK = 'A';
const OPPONENT_CHOOSES_PAPER = 'B';
const OPPONENT_CHOOSES_SCISSORS = 'C';

type InputData = [string, string][];

function formatInput(input: string): InputData {
  return input.split('\n').map(e => e.split(' ')) as InputData;
}

export function run(input: string): string[] {
  const data = formatInput(input);

  const scoreBothPlayersMoves = matches => {
    const PLAYER_CHOOSES_ROCK = 'X';
    const PLAYER_CHOOSES_PAPER = 'Y';
    const PLAYER_CHOOSES_SCISSORS = 'Z';
    const outcomes = {
      [PLAYER_CHOOSES_ROCK]: {
        [OPPONENT_CHOOSES_ROCK]: POINTS_FOR_DRAW + POINTS_FOR_PLAYING_ROCK,
        [OPPONENT_CHOOSES_PAPER]: POINTS_FOR_DEFEAT + POINTS_FOR_PLAYING_ROCK,
        [OPPONENT_CHOOSES_SCISSORS]: POINTS_FOR_VICTORY + POINTS_FOR_PLAYING_ROCK,
      },
      [PLAYER_CHOOSES_PAPER]: {
        [OPPONENT_CHOOSES_ROCK]: POINTS_FOR_VICTORY + POINTS_FOR_PLAYING_PAPER,
        [OPPONENT_CHOOSES_PAPER]: POINTS_FOR_DRAW + POINTS_FOR_PLAYING_PAPER,
        [OPPONENT_CHOOSES_SCISSORS]: POINTS_FOR_DEFEAT + POINTS_FOR_PLAYING_PAPER,
      },
      [PLAYER_CHOOSES_SCISSORS]: {
        [OPPONENT_CHOOSES_ROCK]: POINTS_FOR_DEFEAT + POINTS_FOR_PLAYING_SCISSORS,
        [OPPONENT_CHOOSES_PAPER]: POINTS_FOR_VICTORY + POINTS_FOR_PLAYING_SCISSORS,
        [OPPONENT_CHOOSES_SCISSORS]: POINTS_FOR_DRAW + POINTS_FOR_PLAYING_SCISSORS,
      },
    };
    let score = 0;
    for (const match of matches) {
      score += outcomes[match[1]][match[0]];
    }
    return score;
  };

const scoreExpectedOutcomes = matches => {
    const EXPECTED_OUTCOME_IS_DEFEAT = 'X';
    const EXPECTED_OUTCOME_IS_DRAW = 'Y';
    const EXPECTED_OUTCOME_IS_VICTORY = 'Z';
    const outcomes = {
      [OPPONENT_CHOOSES_ROCK]: {
        [EXPECTED_OUTCOME_IS_DEFEAT]: POINTS_FOR_DEFEAT + POINTS_FOR_PLAYING_SCISSORS,
        [EXPECTED_OUTCOME_IS_DRAW]: POINTS_FOR_DRAW + POINTS_FOR_PLAYING_ROCK,
        [EXPECTED_OUTCOME_IS_VICTORY]: POINTS_FOR_VICTORY + POINTS_FOR_PLAYING_PAPER,
      },
      [OPPONENT_CHOOSES_PAPER]: {
        [EXPECTED_OUTCOME_IS_DEFEAT]: POINTS_FOR_DEFEAT + POINTS_FOR_PLAYING_ROCK,
        [EXPECTED_OUTCOME_IS_DRAW]: POINTS_FOR_DRAW + POINTS_FOR_PLAYING_PAPER,
        [EXPECTED_OUTCOME_IS_VICTORY]: POINTS_FOR_VICTORY + POINTS_FOR_PLAYING_SCISSORS,
      },
      [OPPONENT_CHOOSES_SCISSORS]: {
        [EXPECTED_OUTCOME_IS_DEFEAT]: POINTS_FOR_DEFEAT + POINTS_FOR_PLAYING_PAPER,
        [EXPECTED_OUTCOME_IS_DRAW]: POINTS_FOR_DRAW + POINTS_FOR_PLAYING_SCISSORS,
        [EXPECTED_OUTCOME_IS_VICTORY]: POINTS_FOR_VICTORY + POINTS_FOR_PLAYING_ROCK,
      },
    };
    let score = 0;
    for (const match of matches) {
      score += outcomes[match[0]][match[1]];
    }
    return score;
  };

  return [`${scoreBothPlayersMoves(data)}`, `${scoreExpectedOutcomes(data)}`];
}

use std::error::Error;
use std::fs::File;
use std::io::Read;

fn main() -> Result<(), Box<dyn Error>> {
	let mut file = File::open("input_2.txt")?;
	let mut contents = String::new();
	file.read_to_string(&mut contents)?;
	let total_score = contents.lines().fold(0, |acc, line| {
		assert!(line.len() >= 3);
		let me = line.chars().nth(2).unwrap();
		let opponent = line.chars().next().unwrap();
		acc + Move::score(Move::of(me), Move::of(opponent))
	});
	println!("{total_score}");
	Ok(())
}

enum Move {
	Rock,
	Paper,
	Scissors,
}

impl Move {
	fn of(s: char) -> Move {
		match s {
			'A' | 'X' => Move::Rock,
			'B' | 'Y' => Move::Paper,
			'C' | 'Z' => Move::Scissors,
			_ => unreachable!(),
		}
	}

	fn score(me: Move, opponent: Move) -> u64 {
		match (me, opponent) {
			(Self::Rock, Self::Rock) => 4, // 1 for rock, 3 because rock ties rock
			(Self::Rock, Self::Paper) => 1, // 1 for rock, 0 because rock loses to paper
			(Self::Rock, Self::Scissors) => 7, // 1 for rock, 6 because rock beats scissors 
			(Self::Paper, Self::Rock) => 8, // 2 for paper, 6 because paper beats rock
			(Self::Paper, Self::Paper) => 5, // 2 for paper, 3 because paper ties paper
			(Self::Paper, Self::Scissors) => 2, // 2 for paper, 0 because paper loses to scissors
			(Self::Scissors, Self::Rock) => 3, // 3 for scissors, 0 because scissors loses to rock
			(Self::Scissors, Self::Paper) => 9, // 3 for scissors, 6 because scissors beats paper
			(Self::Scissors, Self::Scissors) => 6, // 3 for scissors, 3 because scissors ties scissors
		}
	}
}