66 lines
1.5 KiB
Rust
66 lines
1.5 KiB
Rust
use crate::Day;
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use anyhow::Result;
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pub struct Day06([u64; 9]);
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impl Day for Day06 {
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fn init(content: String) -> anyhow::Result<Self> {
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let c = content.split(',').map(str::parse).collect::<Result<Vec<usize>, _>>()?;
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let mut w: [u64; 9] = [0, 0, 0, 0, 0, 0, 0, 0, 0];
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for z in c {
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w[z as usize] += 1;
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}
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Ok(Self(w))
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}
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fn part1(&self) -> Result<String> {
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Ok(format!("{}", self.do_magic(80)))
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}
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fn part2(&self) -> Result<String> {
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Ok(format!("{}", self.do_magic(256)))
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}
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}
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impl Day06 {
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fn do_magic(&self, days: u64) -> u64 {
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(0..days).fold(self.0, Self::foo).iter().sum()
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}
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#[allow(clippy::many_single_char_names)]
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fn foo([a, b, c, d, e, f, g, h, i]: [u64; 9], _: u64) -> [u64; 9] {
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[b, c, d, e, f, g, h + a, i, a]
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}
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}
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#[cfg(test)]
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mod tests {
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use crate::day06::Day06;
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use crate::day::Day;
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use anyhow::Result;
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use crate::day_tests;
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const INPUT: &str = r"3,4,3,1,2";
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#[test]
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fn part1_test() -> Result<()> {
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let d = Day06::init(INPUT.to_string())?;
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assert_eq!("5934", d.part1()?);
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Ok(())
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}
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#[test]
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fn part2_test() -> Result<()> {
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let d = Day06::init(INPUT.to_string())?;
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assert_eq!("26984457539", d.part2()?);
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Ok(())
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}
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day_tests!(Day06, "06", "362740", "1644874076764");
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#[test]
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fn youri_test() -> Result<()> {
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let d = Day06::init(String::from("3,4,3,1,2"))?;
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assert_eq!(17614907331943978900, d.do_magic(489));
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Ok(())
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}
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} |