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{ diff --git a/src/day03.rs b/src/day03.rs new file mode 100644 index 0000000..87d1069 --- /dev/null +++ b/src/day03.rs @@ -0,0 +1,173 @@ +use crate::Day; + +pub struct Day03(Vec>); + +impl Day for Day03 { + fn init(content: String) -> Self { + let v = content.lines().map(split_lines).collect(); + Self(v) + } + + fn part1(&self) -> String { + format!("{}", self.gamma() * self.epsilon()) + } + + fn part2(&self) -> String { + format!("{}", self.ox() * self.co2()) + } +} + + +impl Day03 { + pub fn gamma_calc(&self) -> Vec { + let mut result = Vec::new(); + for i in 0..self.0[0].len() { + let bit = !matches!(most_common_bit(&self.0.clone(), i), CommonBit::Zero); + result.push(bit); + } + result + } + pub fn eps_calc(&self) -> Vec { + let mut result = Vec::new(); + for i in 0..self.0[0].len() { + let bit = !matches!(most_common_bit(&self.0.clone(), i), CommonBit::Zero); + result.push(!bit); + } + result + } + + pub fn get_oxygen_generator_rating_binary(&self) -> Vec { + let mut working_set = self.0.clone(); + for i in 0..self.0[0].len() { + let common_bit = !matches!(most_common_bit(&working_set.clone(), i), CommonBit::Zero); + working_set = working_set + .into_iter() + .filter(|x| x[i] == common_bit) + .collect(); + if working_set.len() == 1 { + break; + } + } + working_set[0].clone() + } + pub fn get_co2_scrubber_rating_binary(&self) -> Vec { + let mut working_set = self.0.clone(); + for i in 0..self.0[0].len() { + let common_bit = matches!(least_common_bit(&working_set.clone(), i), CommonBit::One); + working_set = working_set + .into_iter() + .filter(|x| x[i] == common_bit) + .collect(); + if working_set.len() == 1 { + break; + } + } + working_set[0].clone() + } + + pub fn gamma(&self) -> u32 { + convert(&self.gamma_calc()) + } + pub fn epsilon(&self) -> u32 { + convert(&self.eps_calc()) + } + + pub fn ox(&self) -> u32 { + convert(&self.get_oxygen_generator_rating_binary()) + } + pub fn co2(&self) -> u32 { + convert(&self.get_co2_scrubber_rating_binary()) + } +} + +enum CommonBit { + Zero, + One, + Equal, +} + +fn most_common_bit(set: &[Vec], bit_position: usize) -> CommonBit { + let ones_count = set.iter().fold( + 0, + |ones, code| if code[bit_position] { ones + 1 } else { ones }, + ); + let len = (set.len() + 1) / 2; + match ones_count.cmp(&len) { + std::cmp::Ordering::Less => CommonBit::Zero, + std::cmp::Ordering::Equal => CommonBit::Equal, + std::cmp::Ordering::Greater => CommonBit::One, + } +} + +fn least_common_bit(set: &[Vec], bit_position: usize) -> CommonBit { + let ones_count = set.iter().fold( + 0, + |ones, code| if code[bit_position] { ones + 1 } else { ones }, + ); + let len = (set.len() + 1) / 2; + match ones_count.cmp(&len) { + std::cmp::Ordering::Less => CommonBit::One, + std::cmp::Ordering::Equal => CommonBit::Equal, + std::cmp::Ordering::Greater => CommonBit::Zero, + } +} + +pub fn convert(binary: &[bool]) -> u32 { + binary.iter().fold(0, |result, &bit| (result << 1) ^ bit as u32) +} + + +fn split_lines(content: &str) -> Vec { + content.chars().map(|x| x == '1').collect() +} + +#[cfg(test)] +mod tests { + use std::fs::read_to_string; + + use crate::Day03; + use crate::day::Day; + + const INPUT: &str = r"00100 +11110 +10110 +10111 +10101 +01111 +00111 +11100 +10000 +11001 +00010 +01010"; + + #[test] + fn part1_test() { + let t = Day03::init(String::from(INPUT)); + let p1 = t.part1(); + assert_eq!("198", p1) + } + + #[test] + fn part2_test() { + let t = Day03::init(String::from(INPUT)); + let p2 = t.part2(); + assert_eq!("230", p2) + } + + #[test] + fn part1_real() { + let f = read_to_string("./input/day03").expect("Could not load input"); + let t = Day03::init(f); + let p1 = t.part1(); + assert_eq!("4118544", p1) + } + + #[test] + fn part2_real() { + let f = read_to_string("./input/day03").expect("Could not load input"); + let t = Day03::init(f); + let p2 = t.part2(); + assert_eq!("3832770", p2) + } +} \ No newline at end of file diff --git a/src/main.rs b/src/main.rs index f00a020..9d1dfda 100644 --- a/src/main.rs +++ b/src/main.rs @@ -3,19 +3,21 @@ use chrono::Datelike; use clap::{App, Arg}; use crate::day01::Day01; use crate::day02::Day02; +use crate::day03::Day03; use crate::day::Day; mod day; mod day01; mod day02; +mod day03; fn load_input(day: &str) -> String { read_to_string(format!("./input/day{}", day)).expect("Could not load input") } -fn run_day(days: &Vec>, day: usize) { +fn run_day(days: &[Box], day: usize) { if let Some(d) = days.get(day - 1) { - let day_code = d.clone(); + let day_code = d; println!("Running day {}!", day); println!("\tPart 1: {}", d.part1()); println!("\tPart 2: {}", day_code.part2()); @@ -42,25 +44,26 @@ fn main() { .multiple(true)) .get_matches(); - let days: Vec> = vec![Box::new(Day01::init(load_input("01"))), Box::new(Day02::init(load_input("02")))]; + let days: Vec> = vec![Box::new(Day01::init(load_input("01"))), Box::new(Day02::init(load_input("02"))), + Box::new(Day03::init(load_input("03")))]; let _verbosity = matches.occurrences_of("v"); if matches.is_present("all") { let l = days.len(); println!("running {} days!", l); - for v in 1..l + 1 { + for v in 1..=l { run_day(&days, v); } } else if let Some(d) = matches.values_of("DAY") { - let d = d.map(|x| x.parse::().expect("Did not provide an int!")); + let d = d.map(|x| x.parse::().expect("Did not provide an int!")); for v in d { - run_day(&days, v as usize); + run_day(&days, v); } } else { let v = chrono::Local::now(); if v.month() != 12 { - println!("This was really only meant to be used in december...") + println!("This was really only meant to be used in december..."); } - run_day(&days, v.day() as usize) + run_day(&days, v.day() as usize); } }