59 lines
1.5 KiB
Rust
59 lines
1.5 KiB
Rust
use anyhow::Result;
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pub struct Day01(Vec<i32>);
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impl crate::day::Day for Day01 {
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fn init(f: String) -> Result<Self> {
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let v = f.lines().map(str::parse).collect::<Result<Vec<_>, _>>()?;
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Ok(Self(v))
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}
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fn part1(&self) -> Result<String> {
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let (a, _) = self.0.iter().copied().fold((0, -1), increments);
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Ok(format!("{}", a))
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}
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fn part2(&self) -> Result<String> {
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let ws = self.0.windows(3).map(|a| a.iter().fold(0, std::ops::Add::add)).collect::<Vec<i32>>();
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let (a, _) = ws.iter().copied().fold((0, -1), increments);
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Ok(format!("{}", a))
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}
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}
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fn increments((a, b): (i32, i32), c: i32) -> (i32, i32) {
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if b == -1 {
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(a, c)
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} else if c > b {
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(a + 1, c)
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} else {
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(a, c)
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}
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}
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#[cfg(test)]
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pub mod tests {
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use super::Day01;
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use crate::day::Day;
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use crate::day_tests;
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day_tests!(Day01, "01", "1466", "1491");
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#[test]
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pub fn part1_test() -> anyhow::Result<()>{
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let v = vec![199, 200, 208, 210, 200, 207, 240, 269, 260, 263];
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let strs = v.iter().map(i32::to_string).collect::<Vec<String>>().join("\n");
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let d = Day01::init(strs)?;
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assert_eq!("7", d.part1()?);
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Ok(())
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}
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#[test]
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pub fn part2_test() -> anyhow::Result<()>{
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let v = vec![199, 200, 208, 210, 200, 207, 240, 269, 260, 263];
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let strs = v.iter().map(i32::to_string).collect::<Vec<String>>().join("\n");
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let d = Day01::init(strs)?;
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assert_eq!("5", d.part2()?);
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Ok(())
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}
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} |