diff --git a/day3/.gitignore b/day3/.gitignore new file mode 100644 index 0000000..eb5a316 --- /dev/null +++ b/day3/.gitignore @@ -0,0 +1 @@ +target diff --git a/day3/Cargo.lock b/day3/Cargo.lock new file mode 100644 index 0000000..4104d70 --- /dev/null +++ b/day3/Cargo.lock @@ -0,0 +1,7 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +version = 3 + +[[package]] +name = "day3" +version = "0.1.0" diff --git a/day3/Cargo.toml b/day3/Cargo.toml new file mode 100644 index 0000000..898e70d --- /dev/null +++ b/day3/Cargo.toml @@ -0,0 +1,8 @@ +[package] +name = "day3" +version = "0.1.0" +edition = "2021" + +# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] diff --git a/day3/input b/day3/input new file mode 100644 index 0000000..4eccb80 --- /dev/null +++ b/day3/input @@ -0,0 +1,140 @@ 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--git a/day3/src/main.rs b/day3/src/main.rs new file mode 100644 index 0000000..9e89422 --- /dev/null +++ b/day3/src/main.rs @@ -0,0 +1,109 @@ +use std::{ + fs::File, + io::{BufRead, BufReader}, + ops::Range, +}; + +fn main() { + let grid = read_grid(); + let grid_ref: Vec<_> = grid.iter().map(AsRef::as_ref).collect(); + let numbers = Number::discover(&grid_ref); + let part1_result = part1(&numbers, &grid_ref); + let part2_result = part2(&numbers, &grid_ref); + println!("part 1: {part1_result}\npart 2: {part2_result}"); +} + +fn part1(numbers: &[Number], grid: Grid) -> i32 { + let mut total = 0; + for number in numbers { + if number.is_part(grid) { + total += number.value; + } + } + total +} +fn part2(numbers: &[Number], grid: Grid) -> &'static str { + "unsolved" +} + +type Grid<'a> = &'a [&'a [char]]; + +fn read_grid() -> Vec> { + BufReader::new(File::open("input").expect("input")) + .lines() + .map(|line| line.expect("read").chars().collect::>()) + .collect() +} + +#[derive(Debug, Default, Clone, PartialEq, Eq)] +struct Number { + value: i32, + line_number: usize, + location: Range, +} + +impl Number { + fn discover(grid: Grid) -> Vec { + let mut numbers = vec![]; + for (line_number, line) in grid.iter().enumerate() { + let mut i = 0; + while i < line.len() { + let mut chr = &line[i]; + if chr.is_ascii_digit() { + let start = i; + let mut text_of_number = String::new(); + while i < line.len() && line[i].is_ascii_digit() { + text_of_number.push(*chr); + i += 1; + if i == line.len() { + break; + } + chr = &line[i]; + } + numbers.push(Number { + value: text_of_number.parse().expect("parse number"), + line_number, + location: start..i, + }); + } + i += 1; + } + } + numbers + } + fn is_part(&self, grid: Grid) -> bool { + for digit_index in self.location.clone() { + for xoff in [-1_i32, 0, 1] { + for yoff in [-1_i32, 0, 1] { + if xoff == 0 && yoff == 0 { + // skip the actual number + continue; + } + let line_number: i32 = self + .line_number + .try_into() + .unwrap_or_else(|_| panic!("invalid line number {}", self.line_number)); + let line_number: usize = + (line_number + yoff).max(0).try_into().unwrap_or_else(|_| { + panic!("bad yoff {yoff} at line_number {line_number})") + }); + let y = line_number.min(grid.len() - 1); + let line = grid[y]; + let digit_index: i32 = digit_index + .try_into() + .unwrap_or_else(|_| panic!("invalid digit {}", self.line_number)); + let digit_index: usize = (digit_index + xoff) + .max(0) + .try_into() + .unwrap_or_else(|_| panic!("bad xoff {xoff} at digit index {digit_index}")); + let x = digit_index.min(line.len() - 1); + let chr = line[x]; + if chr != '.' && !chr.is_ascii_digit() { + return true; + } + } + } + } + false + } +}