Roflin/AoC-2023
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I'm dumb.

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This commit is contained in:
Dennis Brentjes 2023-12-07 15:34:46 +01:00
parent 77977f9bbc
commit 63ce6b5cf2
2 changed files with 23 additions and 16 deletions
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22
src/days/day6.rs
View File

@ -1,3 +1,4 @@
use std::{path::Path, str::FromStr, iter::zip};
use itertools::Itertools;
@ -77,22 +78,23 @@ impl FromStr for RecordsOverview {
}
}
pub fn number_of_record_beating_chances(max_time: i128, record: i128) -> u32 {
let sqrt = ((max_time.pow(2) - 4 * record) as f64).sqrt();
let answer1 = -((-max_time as f64) + sqrt) / 2f64;
let answer2 = -((-max_time as f64) - sqrt) / 2f64;
(answer2.ceil() - answer1.ceil()) as u32
}
pub fn one() -> Result<u32, AdventError> {
let overview = read_into::<RecordsOverview>(Path::new("resources/input6.txt"))?;
Ok(overview.records.iter().fold(1, |acc, record| {
acc * ((0..(record.time + 1)).into_iter().map(|x| {
x * (record.time - x)
}).filter(|x| {
*x > record.distance
}).count() as u32)
acc * number_of_record_beating_chances(record.time.into(), record.distance.into())
}))
}
pub fn two() -> Result<u32, AdventError> {
let record = read_into::<Record>(Path::new("resources/input6.txt"))?;
Ok((0..(record.time + 1)).into_iter().map(|x| {
x * (record.time - x)
}).filter(|x| {
*x > record.distance
}).count() as u32)
Ok(number_of_record_beating_chances(record.time.into(), record.distance.into()))
}

17
src/main.rs
View File

@ -19,7 +19,7 @@ fn main() -> Result<(), AdventError> {
(day6::one as fn() -> Result<u32, AdventError>, day6::two as fn() -> Result<u32, AdventError>),
];
if env::args().len() != 3 {
if env::args().len() == 1 {
Ok(days.into_iter().map(|(one, two)| {
let one_result = one()?;
let two_result = two()?;
@ -31,11 +31,16 @@ fn main() -> Result<(), AdventError> {
};
}).fold((), |acc, _| { acc }))
} else {
let (one, two) = days[env::args().nth(1).ok_or(AdventError("Failed to parse day".into()))?.parse::<usize>()? - 1];
match env::args().nth(2).unwrap().parse::<usize>()? {
1 => Ok(println!("1: {}", one()?)),
2 => Ok(println!("2: {}", two()?)),
_ => return Err(AdventError("part must be either 1 or 2".into()))
let day_index = env::args().nth(1).ok_or(AdventError("Failed to parse day".into()))?.parse::<usize>()? - 1;
let (one, two) = days[day_index];
if env::args().len() == 3 {
match env::args().nth(2).unwrap().parse::<usize>()? {
1 => Ok(println!("1: {}", one()?)),
2 => Ok(println!("2: {}", two()?)),
_ => return Err(AdventError("part must be either 1 or 2".into()))
}
} else {
Ok(println!("{}: ({}, {})", day_index + 1, one()?, two()?))
}
}