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day05 part1

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This commit is contained in:
Gabe Venberg 2023-12-05 17:51:17 -06:00
parent aea643cf31
commit 8bd03989a8
3 changed files with 219 additions and 13 deletions
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2
days/day05/src/main.rs
View file

@ -7,7 +7,7 @@ fn main() {
let structured_input = parse::parse(input);
println!("Part One");
println!("Result: {}", part1::part1());
println!("Result: {}", part1::part1(&structured_input));
println!("Part Two");
println!("Result: {}", part2::part2());

83
days/day05/src/parse.rs
View file

@ -8,18 +8,25 @@ use nom::{
#[derive(Debug, PartialEq, Eq)]
pub struct Map {
from: String,
to: String,
ranges: Vec<Range>,
pub from: String,
pub to: String,
pub ranges: Vec<Range>,
}
impl Map {
pub fn parse(input: &str) -> IResult<&str, Self> {
pub fn map(&self, src: u64)->u64 {
for range in &self.ranges {
if range.is_applicable(&src) {
return range.map(src);
}
}
src
}
fn parse(input: &str) -> IResult<&str, Self> {
let (input, (from, to)) = delimited(multispace0, Self::parse_to_from, multispace0)(input)?;
let (input, ranges) = many1(Range::parse)(input)?;
Ok((input, Map { from, to, ranges }))
}
fn parse_to_from(input: &str) -> IResult<&str, (String, String)> {
let (input, from) = alpha1(input)?;
let (input, to) = terminated(preceded(tag("-to-"), alpha1), tag(" map:\n"))(input)?;
@ -29,13 +36,26 @@ impl Map {
#[derive(Debug, PartialEq, Eq)]
pub struct Range {
dest_start: u64,
src_start: u64,
len: u64,
pub dest_start: u64,
pub src_start: u64,
pub len: u64,
}
impl Range {
pub fn parse(input: &str) -> IResult<&str, Self> {
fn is_applicable(&self, src: &u64) -> bool {
self.src_start <= *src && *src < (self.src_start + self.len)
}
fn map(&self, src: u64) -> u64 {
if self.is_applicable(&src) {
let offset = src - self.src_start;
self.dest_start + offset
} else {
src
}
}
fn parse(input: &str) -> IResult<&str, Self> {
let number = delimited(multispace0, nom::character::complete::u64, multispace0);
let (input, numbers) = count(number, 3)(input)?;
Ok((
@ -66,6 +86,51 @@ pub fn parse(input: &str) -> (Vec<u64>, Vec<Map>) {
mod tests {
use super::*;
#[test]
fn test_map() {
let tested = Map {
from: "seed".to_string(),
to: "soil".to_string(),
ranges: vec![
Range {
dest_start: 50,
src_start: 98,
len: 2,
},
Range {
dest_start: 52,
src_start: 50,
len: 48,
},
],
};
let input = [79, 14, 55, 13];
let output = input.map(|i| tested.map(i));
assert_eq!(output, [81, 14, 57, 13])
}
#[test]
fn test_is_appliccable() {
let tested = Range {
dest_start: 50,
src_start: 98,
len: 2,
};
assert!(tested.is_applicable(&99));
assert!(!tested.is_applicable(&100));
assert!(!tested.is_applicable(&97));
}
#[test]
fn test_range_map() {
let tested = Range {
dest_start: 52,
src_start: 50,
len: 48,
};
assert_eq!(tested.map(79), 81);
assert_eq!(tested.map(100), 100);
}
#[test]
fn test_map_parse() {
let input = concat!("seed-to-soil map:\n", "50 98 2\n", "52 50 48\n", "\n",);

147
days/day05/src/part1.rs
View file

@ -1,7 +1,11 @@
use crate::parse::*;
pub fn part1() -> usize {
unimplemented!()
pub fn part1(input: &(Vec<u64>, Vec<Map>)) -> usize {
let mut seeds = input.0.clone();
for map in &input.1{
seeds = seeds.into_iter().map(|s| map.map(s)).collect()
}
*seeds.iter().min().unwrap() as usize
}
#[cfg(test)]
@ -10,6 +14,143 @@ mod tests {
#[test]
fn test_part1() {
assert_eq!(0, 0);
let input = (
vec![79, 14, 55, 13],
vec![
Map {
from: "seed".to_string(),
to: "soil".to_string(),
ranges: vec![
Range {
dest_start: 50,
src_start: 98,
len: 2
},
Range {
dest_start: 52,
src_start: 50,
len: 48
}
]
},
Map {
from: "soil".to_string(),
to: "fertilizer".to_string(),
ranges: vec![
Range {
dest_start: 0,
src_start: 15,
len: 37
},
Range {
dest_start: 37,
src_start: 52,
len: 2
},
Range {
dest_start: 39,
src_start: 0,
len: 15
}
]
},
Map {
from: "fertilizer".to_string(),
to: "water".to_string(),
ranges: vec![
Range {
dest_start: 49,
src_start: 53,
len: 8
},
Range {
dest_start: 0,
src_start: 11,
len: 42
},
Range {
dest_start: 42,
src_start: 0,
len: 7
},
Range {
dest_start: 57,
src_start: 7,
len: 4
}
]
},
Map {
from: "water".to_string(),
to: "light".to_string(),
ranges: vec![
Range {
dest_start: 88,
src_start: 18,
len: 7
},
Range {
dest_start: 18,
src_start: 25,
len: 70
}
]
},
Map {
from: "light".to_string(),
to: "temperature".to_string(),
ranges: vec![
Range {
dest_start: 45,
src_start: 77,
len: 23
},
Range {
dest_start: 81,
src_start: 45,
len: 19
},
Range {
dest_start: 68,
src_start: 64,
len: 13
}
]
},
Map {
from: "temperature".to_string(),
to: "humidity".to_string(),
ranges: vec![
Range {
dest_start: 0,
src_start: 69,
len: 1
},
Range {
dest_start: 1,
src_start: 0,
len: 69
}
]
},
Map {
from: "humidity".to_string(),
to: "location".to_string(),
ranges: vec![
Range {
dest_start: 60,
src_start: 56,
len: 37
},
Range {
dest_start: 56,
src_start: 93,
len: 4
}
]
}
]
);
assert_eq!(part1(&input), 35);
}
}