bert/adventofcode
1
0
Fork 0
mirror of https://github.com/bertptrs/adventofcode.git synced 2025-12-25 21:00:31 +01:00
Code Issues Projects Releases Wiki Activity

Stream to reduce peak allocations

Browse Source
This commit is contained in:
Bert Peters
2022-12-13 18:22:26 +01:00
parent 4b18a733c9
commit f48a02c81c
1 changed files with 7 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
2022/src/day13.rs
View File

@@ -6,6 +6,7 @@ use nom::branch::alt;
use nom::bytes::complete::tag;
use nom::character::complete::multispace1;
use nom::character::complete::newline;
use nom::combinator::iterator;
use nom::combinator::map;
use nom::multi::many0;
use nom::multi::separated_list0;
@@ -72,21 +73,17 @@ fn parse_signal(input: &[u8]) -> IResult<&[u8], Signal> {
))(input)
}
fn parse_signal_pairs(input: &[u8]) -> IResult<&[u8], Vec<(Signal, Signal)>> {
separated_list0(
newline,
fn parse_signal_pair(input: &[u8]) -> IResult<&[u8], (Signal, Signal)> {
pair(
terminated(parse_signal, newline),
terminated(parse_signal, newline),
),
terminated(parse_signal, multispace1),
)(input)
}
pub fn part1(input: &[u8]) -> Result<String> {
let signals = parse_input(input, parse_signal_pairs)?;
let mut iterator = iterator(input, parse_signal_pair);
let result: usize = signals
.into_iter()
let result: usize = (&mut iterator)
.enumerate()
.filter_map(|(i, (first, second))| (first < second).then_some(i + 1))
.sum();