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wrapping_paper(&self) -> u32 { + self.surface_area() + self.slack() + } + + fn surface_area(&self) -> u32 { + self.side_areas().iter().fold(0, |acc, &area| acc + 2 * area) + } + + fn slack(&self) -> u32 { + *self.side_areas().iter().min().unwrap_or(&0) + } + + fn side_areas(&self) -> Vec { + vec![self.length * self.width, self.width * self.height, self.height * self.length] + } +} + +#[test] +fn test_day02() { + let mut present = Present::new("2x3x4".to_string()); + assert_eq!(52, present.surface_area()); + assert_eq!(6, present.slack()); + assert_eq!(58, present.wrapping_paper()); + + present = Present::new("1x1x10".to_string()); + assert_eq!(42, present.surface_area()); + assert_eq!(1, present.slack()); + assert_eq!(43, present.wrapping_paper()); +} diff --git a/rust/src/lib.rs b/rust/src/lib.rs index 25634d4..507339b 100644 --- a/rust/src/lib.rs +++ b/rust/src/lib.rs @@ -2,4 +2,6 @@ pub use day::Day; mod day; pub use day_01::Day01; +pub use day_02::Day02; mod day_01; +mod day_02; diff --git a/rust/src/main.rs b/rust/src/main.rs index da81c67..cd6d806 100644 --- a/rust/src/main.rs +++ b/rust/src/main.rs @@ -19,7 +19,7 @@ fn read_input(filename: &str) -> Result { } fn main() { - let input = read_input("day_01").unwrap(); - let day = Day01::new(input); + let input = read_input("day_02").unwrap(); + let day = Day02::new(input); println!("{}", day.solve().unwrap()); }