Added Day 2 and command line argument for specifying which day to run
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@ -32,5 +32,4 @@ pub fn run() {
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assert!(calorie_totals.len() >= 3);
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assert!(calorie_totals.len() >= 3);
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println!("Day 1 Part A Answer: {}", calorie_totals[0]);
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println!("Day 1 Part A Answer: {}", calorie_totals[0]);
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println!("Day 1 Part B Answer: {}", calorie_totals[0] + calorie_totals[1] + calorie_totals[2]);
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println!("Day 1 Part B Answer: {}", calorie_totals[0] + calorie_totals[1] + calorie_totals[2]);
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}
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}
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@ -0,0 +1,71 @@
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use std::fs::File;
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use std::io::BufReader;
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use std::io::BufRead;
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pub fn run() {
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let file = File::open("resources/day2input.txt").expect("Input file not found.");
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let reader = BufReader::new(file);
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let mut part1_score: u32 = 0;
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let mut part2_score: u32 = 0;
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for line in reader.lines() {
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let str = line.unwrap();
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let input_arguments = str.split(" ").collect::<Vec<&str>>();
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println!("Round: {:?}, {:?}", input_arguments[0], input_arguments[1]);
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let instruction_a = input_arguments[0].chars().next().unwrap();
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let instruction_b = input_arguments[1].chars().next().unwrap();
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if instruction_b == 'X' {
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part1_score += check_outcome(instruction_b, instruction_a) + get_shape_value(instruction_b); // rock
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part2_score += get_shape_value(get_losing_move(instruction_a)); // lose
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} else if instruction_b == 'Y' {
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part1_score += check_outcome(instruction_b, instruction_a) + get_shape_value(instruction_b); // paper
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part2_score += 3 + get_shape_value(instruction_a); // draw
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} else if instruction_b == 'Z' {
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part1_score += check_outcome(instruction_b, instruction_a) + get_shape_value(instruction_b); // scissors
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part2_score += 6 + get_shape_value(get_winning_move(instruction_a)); // win
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}
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}
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println!("Day 2 Part 1 Answer: {:?}", part1_score);
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println!("Day 2 Part 2 Answer: {:?}", part2_score);
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}
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fn get_shape_value(shape: char) -> u32 {
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return match shape {
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'X' | 'A' => 1, // rock
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'Y' | 'B' => 2, // paper
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'Z' | 'C' => 3, // scissor
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_ => panic!()
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}
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}
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fn get_losing_move(shape: char) -> char {
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return match shape {
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'X' | 'A' => 'C', // rock
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'Y' | 'B' => 'A', // paper
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'Z' | 'C' => 'B', // scissor
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_ => panic!()
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}
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}
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fn get_winning_move(shape: char) -> char {
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return match shape {
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'X' | 'A' => 'B', // rock
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'Y' | 'B' => 'C', // paper
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'Z' | 'C' => 'A', // scissor
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_ => panic!()
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}
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}
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fn check_outcome(a: char, b: char) -> u32 {
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if get_shape_value(a) == get_shape_value(b) {
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return 3;
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} else if get_losing_move(a) == b {
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return 6;
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}
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return 0;
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}
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@ -1,5 +1,19 @@
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use std::env;
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mod day1;
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mod day1;
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mod day2;
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fn main() {
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fn main() {
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day1::run();
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let args: Vec<String> = env::args().collect();
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match args.len() {
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2 => {
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let day_to_run = &args[1];
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match &day_to_run[..] {
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"day1" => day1::run(),
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"day2" => day2::run(),
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_ => eprintln!("error: invalid day")
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}
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},
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_ => eprintln!("Error: not enough or too many arguments.")
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};
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}
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}
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