diff --git a/Cargo.lock b/Cargo.lock index af7db25..12fdae0 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -104,6 +104,14 @@ dependencies = [ "num", ] +[[package]] +name = "day-09" +version = "0.0.0" +dependencies = [ + "indoc", + "itertools", +] + [[package]] name = "either" version = "1.9.0" diff --git a/Cargo.toml b/Cargo.toml index 06ff2b0..13d8a53 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -7,7 +7,8 @@ members = [ "day-05", "day-06", "day-07", - "day-08" + "day-08", + "day-09" ] [workspace.dependencies] diff --git a/day-09/Cargo.toml b/day-09/Cargo.toml new file mode 100644 index 0000000..651d8a1 --- /dev/null +++ b/day-09/Cargo.toml @@ -0,0 +1,10 @@ +[package] +name = "day-09" +version = "0.0.0" +edition = "2021" + +# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] +indoc.workspace = true +itertools.workspace = true diff --git a/day-09/src/bin/input.txt b/day-09/src/bin/input.txt new file mode 100644 index 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39683 59786 88210 127616 181274 253151 348005 471485 +18 33 52 75 103 147 258 596 1573 4137 10313 24197 53757 114135 233848 466630 914030 1767831 3387708 6439669 12137157 +16 32 61 98 136 164 171 173 281 836 2678 7743 20501 51456 125378 299753 704238 1621680 3648963 8007452 17127734 +0 9 25 62 141 293 566 1037 1844 3286 6097 12096 25583 56164 124287 271914 582905 1221701 2506400 5046590 10003946 +-4 12 56 141 280 486 772 1151 1636 2240 2976 3857 4896 6106 7500 9091 10892 12916 15176 17685 20456 \ No newline at end of file diff --git a/day-09/src/bin/part1.rs b/day-09/src/bin/part1.rs new file mode 100644 index 0000000..28ff080 --- /dev/null +++ b/day-09/src/bin/part1.rs @@ -0,0 +1,61 @@ +use itertools::Itertools; + +fn main() { + println!("{}", part1(include_str!("./input.txt"))); +} + +fn part1(input: &str) -> i64 { + input.lines().map(line).sum() +} + +fn line(input: &str) -> i64 { + let nums = input + .split_ascii_whitespace() + .map(|s| s.parse::().expect("invalid digit")) + .collect::>(); + + find_next(&nums) +} + +fn find_next(line: &[i64]) -> i64 { + let differences = line + .iter() + .tuple_windows::<(_, _)>() + .map(|(a, b)| b - a) + .collect::>(); + + let last = *line.last().expect("invalid input"); + + if differences.iter().all(|d| *d == 0) { + last + } else { + last + find_next(&differences) + } +} + +#[cfg(test)] +mod tests { + use super::*; + use indoc::indoc; + + #[test] + fn test_part1() { + assert_eq!( + part1(indoc!( + " + 0 3 6 9 12 15 + 1 3 6 10 15 21 + 10 13 16 21 30 45 + " + )), + 114 + ); + } + + #[test] + fn test_lines_part1() { + assert_eq!(line("0 3 6 9 12 15"), 18); + assert_eq!(line("1 3 6 10 15 21"), 28); + assert_eq!(line("10 13 16 21 30 45"), 68); + } +} diff --git a/day-09/src/bin/part2.rs b/day-09/src/bin/part2.rs new file mode 100644 index 0000000..8eaa6c0 --- /dev/null +++ b/day-09/src/bin/part2.rs @@ -0,0 +1,61 @@ +use itertools::Itertools; + +fn main() { + println!("{}", part2(include_str!("./input.txt"))); +} + +fn part2(input: &str) -> i64 { + input.lines().map(line).sum() +} + +fn line(input: &str) -> i64 { + let nums = input + .split_ascii_whitespace() + .map(|s| s.parse::().expect("invalid digit")) + .collect::>(); + + find_previous(&nums) +} + +fn find_previous(line: &[i64]) -> i64 { + let differences = line + .iter() + .tuple_windows::<(_, _)>() + .map(|(a, b)| b - a) + .collect::>(); + + let first = *line.first().expect("invalid input"); + + if differences.iter().all(|d| *d == 0) { + first + } else { + first - find_previous(&differences) + } +} + +#[cfg(test)] +mod tests { + use super::*; + use indoc::indoc; + + #[test] + fn test_part2() { + assert_eq!( + part2(indoc!( + " + 0 3 6 9 12 15 + 1 3 6 10 15 21 + 10 13 16 21 30 45 + " + )), + 2 + ); + } + + #[test] + fn test_lines_part2() { + assert_eq!(line("0 3 6 9 12 15"), -3); + assert_eq!(line("1 3 6 10 15 21"), 0); + assert_eq!(line("10 13 16 21 30 45"), 5); + } +}