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+...............470.....440.874...116....240........299......................27......409.......................................639.136....... diff --git a/src/bin/day_3.rs b/src/bin/day_3.rs new file mode 100644 index 0000000..29faf97 --- /dev/null +++ b/src/bin/day_3.rs @@ -0,0 +1,167 @@ +use aoc_2022::prelude::*; + +type Input = Vec; + +fn parse(s: &str) -> Result { + Ok(s.lines() + .map(ToOwned::to_owned) + .filter(|line| line.len() != 0) + .collect::>()) +} + +enum ScanState { + WaitingForNumber { + possible: bool, + }, + ReadingNumber { + progress: String, + possible: bool, + }, +} + +#[derive(Debug)] +struct NumberSpan { + value: u32, + start_position: (usize, usize), + length: usize, +} + +impl NumberSpan { + fn is_adjacent(&self, position: (usize, usize)) -> bool { + let min_x = if self.start_position.0 > 0 { + self.start_position.0 - 1 + } else { + 0 + }; + let max_x = self.start_position.0 + self.length; + if position.0 < min_x || position.0 > max_x { + return false; + } + + if position.1 == self.start_position.1 { + return true; + } + + if position.1 >= 1 && (position.1 - 1) == self.start_position.1 { + return true; + } + + (position.1 + 1) == self.start_position.1 + } +} + +struct PartSymbol { + symbol: char, + position: (usize, usize), +} + +#[aoc(day = 3, parse = parse, test_cases = ["day_3.txt"])] +fn day_3(mut input: Input) -> Result<()> { + // Part 1 + println!("Part one: "); + let spare = ".".repeat(input[0].len()); + + let mut total = 0; + let mut symbols = Vec::new(); + let mut spans = Vec::new(); + + for y in 0..(input.len()) { + let above = if y > 0 { + &input[y - 1] + } else { + &spare + }; + let below = if y < input.len() - 1 { + &input[y + 1] + } else { + &spare + }; + let current = &input[y]; + let mut state = ScanState::WaitingForNumber { possible: false }; + for (x, ((above_char, current_char), below_char)) in above.chars().zip(current.chars()).zip(below.chars()).enumerate() { + if current_char != '.' && !current_char.is_numeric() { + symbols.push(PartSymbol { + position: (x, y), + symbol: current_char, + }); + } + let now_possible = (above_char != '.' && !above_char.is_numeric()) || (below_char != '.' && !below_char.is_numeric()); + state = match state { + ScanState::WaitingForNumber { possible } => { + if current_char.is_numeric() { + // transition to number state + ScanState::ReadingNumber { + progress: { + let mut s = String::new(); + s.push(current_char); + s + }, + possible: possible | now_possible, + } + } else { + ScanState::WaitingForNumber { + possible: (current_char != '.') | now_possible, + } + } + }, + ScanState::ReadingNumber { ref progress, possible } => { + let mut progress = progress.clone(); + if current_char.is_numeric() { + progress.push(current_char); + ScanState::ReadingNumber { + progress, + possible: possible | now_possible, + } + } else { + if possible | now_possible | (current_char != '.') { + total += progress.parse::()?; + spans.push(NumberSpan { + start_position: (x - progress.len(), y), + length: progress.len(), + value: progress.parse()?, + }); + ScanState::WaitingForNumber { + possible: now_possible | (current_char != '.'), + } + } else { + ScanState::WaitingForNumber { possible: now_possible } + } + } + }, + }; + } + + if let ScanState::ReadingNumber { progress, possible } = state { + if possible { + total += progress.parse::()?; + spans.push(NumberSpan { + start_position: (current.len() - progress.len(), y), + length: progress.len(), + value: progress.parse()?, + }); + } + } + } + + println!("{total}"); + + // Part 2 + println!("Part two: "); + + let mut ratios = 0; + for part in symbols { + if part.symbol != '*' { continue; } + let adjacent = spans.iter() + .filter(|span| span.is_adjacent(part.position)) + .collect::>(); + println!("{adjacent:?}"); + if adjacent.len() == 2 { + println!("{:?}", part.position); + ratios += dbg!(adjacent[0].value) * dbg!(adjacent[1].value); + } + } + + println!("{ratios}"); + + Ok(()) +} diff --git a/test_cases/day_3.txt b/test_cases/day_3.txt new file mode 100644 index 0000000..624ea4f --- /dev/null +++ b/test_cases/day_3.txt @@ -0,0 +1,10 @@ +467..114.. +...*...... +..35..633. +......#... +617*...... +.....+.58. +..592..... +......755. +...$.*.... +.664.598.. \ No newline at end of file