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static DAY: u8 = 15;
fn main() {
let input = advent::read_file(DAY);
println!("{DAY}a: {}", hash_sum(&input));
println!("{DAY}b: {}", 0);
}
fn hash(input: &str) -> u32 {
let mut value = 0;
for c in input.chars() {
value += c as u32;
value *= 17;
value %= 256;
}
value
}
fn hash_sum(input: &str) -> u32 {
let input = input.trim_end();
input.split(',')
.map(|x| hash(x))
.sum()
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test() {
let input = "rn=1,cm-,qp=3,cm=2,qp-,pc=4,ot=9,ab=5,pc-,pc=6,ot=7";
assert_eq!(hash("HASH"), 52);
assert_eq!(hash_sum(input), 1320);
}
}
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