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| @@ -0,0 +1 @@ | ||
| /target |
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| [package] | ||
| name = "day-03" | ||
| version = "0.1.0" | ||
| authors = ["Michal Baumgartner <[email protected]>"] | ||
| edition = "2018" | ||
|
|
||
| # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html | ||
|
|
||
| [dependencies] |
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| @@ -0,0 +1,323 @@ | ||
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| ..##.........##.........##.........##.........##.........##....... | ||
| #...#...#..#...#...#..#...#...#..#...#...#..#...#...#..#...#...#.. | ||
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| .#..#...#.#.#..#...#.#.#..#...#.#.#..#...#.#.#..#...#.#.#..#...#.# |
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| @@ -0,0 +1,44 @@ | ||
| #![feature(bool_to_option)] | ||
|
|
||
| use std::{error::Error, fs::File, io::BufReader, iter, io::prelude::*}; | ||
|
|
||
| fn main() -> Result<(), Box<dyn Error>> { | ||
| let file = File::open("input/input1.txt")?; | ||
| let reader = BufReader::new(file); | ||
| let tree_char = '#'; | ||
|
|
||
| let tree_count = reader.lines().skip(1).enumerate().filter_map(|(idx, line)| { | ||
| let row = line.ok()?; | ||
| let offset = ((idx+1) * 3) % row.len(); | ||
|
|
||
| (row.chars().nth(offset)? == tree_char).then_some(()) | ||
| }).count(); | ||
|
|
||
| println!("Part 1: {}", tree_count); | ||
|
|
||
| let file = File::open("input/input1.txt")?; | ||
| let reader = BufReader::new(file); | ||
|
|
||
| let offset_bases: Vec<(usize, usize)> = vec![(1, 1), (1, 3), (1, 5), (1, 7), (2, 1)]; | ||
| let mut matches: Vec<usize> = iter::repeat(0).take(offset_bases.len()).collect(); | ||
|
|
||
| for (idx, line) in reader.lines().skip(1).enumerate() { | ||
| let row = line?; | ||
| let row_len = row.len(); | ||
| let current_row = idx + 1; // since we skip the first row | ||
|
|
||
| for (offset_idx, (row_peek, column_peek)) in offset_bases.iter().enumerate() { | ||
| if current_row % row_peek != 0 { continue; } | ||
| let offset = ((current_row / row_peek) * column_peek) % row_len; | ||
|
|
||
| if row.chars().nth(offset).unwrap() == tree_char { | ||
| matches[offset_idx] += 1; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| println!("Part 2: {:#?}", matches); | ||
| println!("Part 2: {}", matches.iter().fold(1, |a, b| a * b)); | ||
|
|
||
| Ok(()) | ||
| } |