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#[derive(Debug)]
struct GameSet {
red: u32,
green: u32,
blue: u32
}
fn normalize(x: u32) -> u32 {
if x == 0 {
1
} else {
x
}
}
impl GameSet {
fn power(&self) -> u32 {
normalize(self.red) * normalize(self.green) * normalize(self.blue)
}
}
struct Game {
id: u32,
sets: Vec<GameSet>
}
impl Game {
fn min_gameset(&self) -> GameSet {
let mut red = 0;
let mut green = 0;
let mut blue = 0;
for gameset in self.sets.iter() {
if gameset.red > 0 {
red = u32::max(red, gameset.red);
}
if gameset.green > 0 {
green = u32::max(green, gameset.green);
}
if gameset.blue > 0 {
blue = u32::max(blue, gameset.blue);
}
}
GameSet {
red, green, blue
}
}
}
fn main() {
let input = include_str!("./input.txt");
let output: u32 = input
.lines()
.map(|line| {
process_line(line)
})
.map(|game| {
game.min_gameset().power()
})
.sum();
println!("Result {output}")
}
fn gameset_from_pairs(pairs: Vec<(&str, u32)>) -> GameSet {
let mut red: u32 = 0;
let mut green: u32 = 0;
let mut blue: u32 = 0;
for pair in pairs {
match pair {
("red", x) => { red = x },
("green", x) => { green = x },
("blue", x) => { blue = x },
what => panic!("Unknown pair {:?}", what)
}
}
GameSet { red, green, blue }
}
/// Progrss a line
fn process_line(string: &str) -> Game {
let game_split: Vec<&str> = string.splitn(2, ": ").collect();
// Get game Id from string "Game 1"
let game_id = game_split[0].split(" ").last().expect("Expected id").parse::<u32>().expect("Cant parse game id");
let sets: Vec<_> = game_split[1]
.split("; ")
.map(|set_line| {
set_line.split(", ").collect()
})
.map(|gameset: Vec<&str>| {
let pairs: Vec<(&str, u32)> = gameset.into_iter().map(|s| {
let split: Vec<&str> = s.split_whitespace().collect();
(split[1], split[0].parse::<u32>().expect("Cant parse"))
}).collect();
gameset_from_pairs(pairs)
})
.collect();
Game {
id: game_id,
sets
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_process_simple() {
let game = process_line("Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green");
assert_eq!(game.id, 1);
}
#[test]
fn test_input() {
let input = "Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green
Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue
Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red
Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red
Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green";
let output: u32 = input
.lines()
.map(|line| {
process_line(line)
})
.map(|game| {
game.min_gameset()
})
.inspect(|power| { dbg!(power); })
.map(|gs| { gs.power() })
.sum();
assert_eq!(output, 2286);
}
}
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