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fn main() {
let input = advent::read_lines(2);
println!("2a: {}", calculate(&input, area_with_slack));
println!("2b: {}", calculate(&input, ribbon_length));
}
fn area_with_slack(a: u32, b: u32, c: u32) -> u32 {
let x = a * b;
let y = a * c;
let z = b * c;
let slack = *[x, y, z].iter().min().unwrap();
2*x + 2*y + 2*z + slack
}
fn ribbon_length(a: u32, b: u32, c: u32) -> u32 {
let mut lens = Vec::from([a, b, c]);
lens.sort();
2 * lens[0] + 2 * lens[1] + lens.iter().product::<u32>()
}
fn calculate<T: AsRef<str>>(input: &[T], f: fn(u32, u32, u32) -> u32) -> u32 {
input.iter()
.map(|line| line.as_ref()
.splitn(3, 'x')
.map(|n| n.parse::<u32>().unwrap())
.collect::<Vec<u32>>())
.map(|v| f(v[0], v[1], v[2]))
.sum()
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_area() {
assert_eq!(area_with_slack(2,3,4), 58);
assert_eq!(area_with_slack(1,1,10), 43);
}
#[test]
fn test_ribbon() {
assert_eq!(ribbon_length(2,3,4), 34);
assert_eq!(ribbon_length(1,1,10), 14);
}
}
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