diff --git a/advent_of_code/2015/3/Cargo.toml b/advent_of_code/2015/3/Cargo.toml new file mode 100644 index 0000000..fca4e93 --- /dev/null +++ b/advent_of_code/2015/3/Cargo.toml @@ -0,0 +1,8 @@ +[package] +name = "main" +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/advent_of_code/2015/3/input.txt b/advent_of_code/2015/3/input.txt new file mode 100644 index 0000000..a5954e7 --- /dev/null +++ b/advent_of_code/2015/3/input.txt @@ -0,0 +1 @@ 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\ No newline at end of file diff --git a/advent_of_code/2015/3/src/main.rs b/advent_of_code/2015/3/src/main.rs new file mode 100644 index 0000000..f86618b --- /dev/null +++ b/advent_of_code/2015/3/src/main.rs @@ -0,0 +1,69 @@ +use std::{borrow::BorrowMut, collections::HashSet}; + +fn solve_first(input: &str) -> usize { + let mut coord = (0, 0); + let mut visited = HashSet::new(); + visited.insert(coord); + + for c in input.chars() { + match c { + '>' => coord.0 += 1, + '<' => coord.0 -= 1, + '^' => coord.1 += 1, + 'v' => coord.1 -= 1, + _ => (), + } + + visited.insert(coord); + } + + visited.len() +} + +fn solve_second(input: &str) -> usize { + let mut santa_coord = (0, 0); + let mut robo_coord = (0, 0); + + let mut visited = HashSet::new(); + visited.insert(santa_coord); + + for (idx, c) in input.chars().enumerate() { + let coord = if idx % 2 == 0 { + santa_coord.borrow_mut() + } else { + robo_coord.borrow_mut() + }; + + match c { + '>' => coord.0 += 1, + '<' => coord.0 -= 1, + '^' => coord.1 += 1, + 'v' => coord.1 -= 1, + _ => (), + } + + visited.insert(coord.clone()); + } + + visited.len() +} + +fn main() { + println!("Hello, this is Patrick!"); + + let input_txt = include_str!("../input.txt"); + + let result_first = solve_first(input_txt); + + println!( + "The number of houses that receive at least one present is {}", + result_first + ); + + let result_second = solve_second(input_txt); + + println!( + "The number of houses that receive at least one present in the year after is {}", + result_second + ); +}