From c4b122b34667394b74c010c2b39d0c09b04e14c4 Mon Sep 17 00:00:00 2001 From: Franco Colmenarez Date: Wed, 11 Dec 2024 22:48:19 -0500 Subject: [PATCH] star twenty two --- Cargo.lock | 294 +++++++++++++++++++++++++++++++++++++++++ Cargo.toml | 1 + src/main.rs | 2 + src/star_twenty_two.rs | 72 ++++++++++ 4 files changed, 369 insertions(+) create mode 100644 src/star_twenty_two.rs diff --git a/Cargo.lock b/Cargo.lock index 7b396aa..7084dcc 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -2,6 +2,18 @@ # It is not intended for manual editing. version = 3 +[[package]] +name = "ahash" +version = "0.8.11" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "e89da841a80418a9b391ebaea17f5c112ffaaa96f621d2c285b5174da76b9011" +dependencies = [ + "cfg-if", + "once_cell", + "version_check", + "zerocopy", +] + [[package]] name = "aho-corasick" version = "1.1.3" @@ -11,19 +23,168 @@ dependencies = [ "memchr", ] +[[package]] +name = "allocator-api2" +version = "0.2.21" +source = 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"proc-macro2", + "quote", + "syn", +] diff --git a/Cargo.toml b/Cargo.toml index 3f40e65..5182e15 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -4,4 +4,5 @@ version = "0.1.0" edition = "2021" [dependencies] +cached = "0.54.0" regex = "1.11.1" diff --git a/src/main.rs b/src/main.rs index d2a5a34..16b93c0 100644 --- a/src/main.rs +++ b/src/main.rs @@ -21,6 +21,7 @@ mod star_eighteen; mod star_nineteen; mod star_twenty; mod star_twenty_one; +mod star_twenty_two; fn main() { let args: Vec = env::args().collect(); @@ -46,6 +47,7 @@ fn main() { "19" => star_nineteen::run(), "20" => star_twenty::run(), "21" => star_twenty_one::run(), + "22" => star_twenty_two::run(), _ => unreachable!(), } } diff --git a/src/star_twenty_two.rs b/src/star_twenty_two.rs new file mode 100644 index 0000000..0a4d809 --- /dev/null +++ b/src/star_twenty_two.rs @@ -0,0 +1,72 @@ +use std::fs; +use cached::proc_macro::cached; + +pub fn run() { + let file = fs::read_to_string("./inputs/star_twenty_two.txt").unwrap(); + let result = count_actual_stones(&file, 75); + + println!("Result: {}", result); +} + +fn count_actual_stones(stones: &String, blink_count: usize) -> usize { + stones.split_whitespace() + .map(|s| s.parse::().unwrap()) + .map(|stone| count_resulting_stones(stone, blink_count)) + .sum() +} + +#[cached] +fn count_resulting_stones(stone: usize, blinks: usize) -> usize { + if blinks <= 0 { + return 1; + } + if stone == 0 { + return count_resulting_stones(1, blinks - 1); + } + let digits = get_digits(stone); + if digits & 1 == 1 { + return count_resulting_stones(stone * 2024, blinks - 1); + } + let half = digits / 2; + let pow = 10_usize.pow(half); + let first_half = stone / pow; + let second_half = stone % pow; + + count_resulting_stones(first_half, blinks - 1) + + count_resulting_stones(second_half, blinks - 1) +} + +fn get_digits(num: usize) -> u32 { + let mut digits = 0; + let mut aux = num; + while aux >= 1 { + aux /= 10; + digits += 1; + } + digits +} + + +#[cfg(test)] +mod tests { + use super::*; + + #[test] + fn test_count_actual_stones() { + assert_eq!(count_actual_stones(&"125 17".to_string(), 1), 3); + assert_eq!(count_actual_stones(&"125 17".to_string(), 2), 4); + assert_eq!(count_actual_stones(&"125 17".to_string(), 3), 5); + assert_eq!(count_actual_stones(&"125 17".to_string(), 4), 9); + assert_eq!(count_actual_stones(&"125 17".to_string(), 5), 13); + assert_eq!(count_actual_stones(&"125 17".to_string(), 6), 22); + assert_eq!(count_actual_stones(&"125 17".to_string(), 25), 55312); + } + + #[test] + fn test_count_resulting_stones() { + assert_eq!(count_resulting_stones(0, 1), 1); + assert_eq!(count_resulting_stones(1000, 1), 2); + assert_eq!(count_resulting_stones(1234, 1), 2); + assert_eq!(count_resulting_stones(1, 1), 1); + } +}