From 9c1d1160e25fe75b737a08c5b3b30742a9b8e9c6 Mon Sep 17 00:00:00 2001 From: Kristofers Solo Date: Sun, 3 Dec 2023 15:57:13 +0200 Subject: [PATCH] finished day 03 part 2 --- 2023/day-03/input2.txt | 140 +++++++++++++++++++++++++++++++++++ 2023/day-03/src/bin/part2.rs | 9 +++ 2023/day-03/src/part2.rs | 124 +++++++++++++++++++++++++++++++ 3 files changed, 273 insertions(+) create mode 100644 2023/day-03/input2.txt create mode 100644 2023/day-03/src/bin/part2.rs create mode 100644 2023/day-03/src/part2.rs diff --git a/2023/day-03/input2.txt b/2023/day-03/input2.txt new file mode 100644 index 0000000..97c616e --- /dev/null +++ b/2023/day-03/input2.txt @@ -0,0 +1,140 @@ +.854...........................................................................362...........271...732........838.........24................ +...*.............................117*...........459........767*648....#.........*...................................$...&..=................ 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+......*...............................449..................802........762.....522..139+..154..266$......................46.323.....712*..... +....827.....................................35......600*29.....724........488............*...............149*227.........*.................. +........@......278*............@..135..........594.........470*...........*....540*.......42..............................775.536..790...... +.....990...........742......181....*..............*..@521................743.......552............310...*....+738.....................*..... +.......................125.......311............715........263...........................................173...................235....291... diff --git a/2023/day-03/src/bin/part2.rs b/2023/day-03/src/bin/part2.rs new file mode 100644 index 0000000..1db364c --- /dev/null +++ b/2023/day-03/src/bin/part2.rs @@ -0,0 +1,9 @@ +use color_eyre::Result; +use day_03::part2::process; + +fn main() -> Result<()> { + let file = include_str!("../../input2.txt"); + let result = process(file)?; + println!("{}", result); + Ok(()) +} diff --git a/2023/day-03/src/part2.rs b/2023/day-03/src/part2.rs new file mode 100644 index 0000000..35d0871 --- /dev/null +++ b/2023/day-03/src/part2.rs @@ -0,0 +1,124 @@ +use std::collections::{BTreeMap, HashSet}; + +use color_eyre::Result; +use itertools::Itertools; + +#[derive(Debug)] +enum Value { + Symbol(char), + Empty, + Number(u32), +} + +pub fn process(input: &str) -> Result { + let map: BTreeMap<(i32, i32), Value> = input + .lines() + .enumerate() + .flat_map(|(y, line)| { + line.chars().enumerate().map(move |(x, ch)| { + ( + (y as i32, x as i32), + match ch { + '.' => Value::Empty, + c if c.is_ascii_digit() => { + Value::Number(c.to_digit(10).expect("Should be a number")) + } + c => Value::Symbol(c), + }, + ) + }) + }) + .collect(); + + let mut numbers: Vec> = Vec::new(); + + for ((y, x), value) in &map { + if let Value::Number(num) = value { + match numbers.iter().last() { + Some(val) + if val + .last() + .map(|((last_num_x, _), _)| last_num_x + 1 == *x) + .unwrap_or(false) => + { + numbers.last_mut().unwrap().push(((*x, *y), *num)) + } + _ => numbers.push(vec![((*x, *y), *num)]), + } + } + } + + let mut sum = 0; + for symbol in map + .iter() + .filter(|(_, value)| matches!(value, Value::Symbol('*'))) + { + let positions = [ + (-1, -1), + (-1, 0), + (-1, 1), + (0, -1), + (0, 0), + (0, 1), + (1, -1), + (1, 0), + (1, 1), + ]; + let pos_to_check: HashSet<_> = positions + .iter() + .map(|outer_pos| (outer_pos.0 + symbol.0 .1, outer_pos.1 + symbol.0 .0)) + .collect(); + + let indexes_of_numbers: HashSet<_> = pos_to_check + .iter() + .flat_map(|pos| { + numbers.iter().enumerate().filter_map(move |(i, num_list)| { + num_list + .iter() + .find(|(num_pos, _)| num_pos == pos) + .map(|_| i) + }) + }) + .collect(); + + let is_gear = indexes_of_numbers.iter().unique().count() == 2; + + if is_gear { + sum += indexes_of_numbers + .iter() + .unique() + .map(|index| { + numbers[*index] + .iter() + .map(|(_, num)| num.to_string()) + .collect::() + .parse::() + .unwrap_or_default() + }) + .product::(); + } + } + + Ok(sum) +} + +#[cfg(test)] +mod tests { + use super::*; + + #[test] + fn test_process() -> Result<()> { + let input = "467..114.. +...*...... +..35..633. +......#... +617*...... +.....+.58. +..592..... +......755. +...$.*.... +.664.598.."; + assert_eq!(467835, process(input)?); + Ok(()) + } +}