[day 1] solution

This commit is contained in:
Drew Haven 2025-12-11 17:45:10 -08:00
parent 2f0b0f06b8
commit ce0ba0f16c
6 changed files with 366 additions and 13 deletions

237
Cargo.lock generated
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@ -23,10 +23,22 @@ version = "0.12.0"
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"chrono",
"dhat",
"env_logger",
"log",
"nom",
"pico-args",
"tinyjson",
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@ -42,6 +54,56 @@ dependencies = [
"libc",
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@ -104,6 +166,12 @@ dependencies = [
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@ -126,6 +194,29 @@ dependencies = [
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@ -155,12 +246,42 @@ dependencies = [
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@ -194,9 +315,9 @@ dependencies = [
[[package]]
name = "log"
version = "0.4.20"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
name = "memchr"
@ -223,6 +344,15 @@ dependencies = [
"sys-info",
]
[[package]]
name = "nom"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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@ -247,6 +377,12 @@ version = "1.19.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
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@ -277,19 +413,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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@ -303,6 +454,35 @@ dependencies = [
"bitflags",
]
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@ -329,18 +509,28 @@ checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
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@ -366,9 +556,9 @@ checksum = "4dccd0940a2dcdf68d092b8cbab7dc0ad8fa938bf95787e1b916b0e3d0e8e970"
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@ -403,6 +593,12 @@ version = "1.0.12"
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@ -466,6 +662,21 @@ dependencies = [
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@ -24,6 +24,9 @@ test_lib = []
# Template dependencies
chrono = { version = "0.4.38", optional = true }
dhat = { version = "0.3.3", optional = true }
env_logger = "0.11.8"
log = "0.4.29"
nom = "8.0.0"
pico-args = "0.5.0"
tinyjson = "2.5.1"

10
data/examples/01.txt Normal file
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@ -0,0 +1,10 @@
L68
L30
R48
L5
R60
L55
L1
L99
R14
L82

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@ -20,8 +20,16 @@
with pkgs;
mkShell {
buildInputs = [
# Rust toolchain
rustc
cargo
# AoC tooling
aoc-cli
# Dev tools
crates-lsp
rust-analyzer
clippy
rustfmt
];

120
src/bin/01.rs Normal file
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@ -0,0 +1,120 @@
advent_of_code::solution!(1);
use nom::{
IResult, Parser,
branch::alt,
bytes::complete::{tag, take_while},
combinator::map_res,
multi::separated_list1,
};
#[derive(Debug)]
enum Command {
Left(u16),
Right(u16),
}
fn decimal(input: &str) -> IResult<&str, u16> {
map_res(take_while(|c| char::is_digit(c, 10)), str::parse).parse(input)
}
fn left_command(input: &str) -> IResult<&str, Command> {
let (input, _) = tag("L")(input)?;
let (input, value) = decimal(input)?;
Ok((input, Command::Left(value)))
}
fn right_command(input: &str) -> IResult<&str, Command> {
let (input, _) = tag("R")(input)?;
let (input, value) = decimal(input)?;
Ok((input, Command::Right(value)))
}
fn commands(input: &str) -> IResult<&str, Vec<Command>> {
separated_list1(tag("\n"), alt((left_command, right_command))).parse(input)
}
fn parse_input(input: &str) -> Option<Vec<Command>> {
let result = commands(input);
match result {
Err(e) => {
log::error!("Error parsing input: {e}");
None
}
Ok((remaining, commands)) => {
if remaining.is_empty() {
log::error!("Not all input parsed: '{remaining}'");
return None;
}
Some(commands)
}
}
}
fn count_explicit_zeroes(commands: Vec<Command>) -> u64 {
let mut position: i32 = 50;
let mut num_zeroes = 0;
for command in commands {
log::debug!("Command: {command:?}");
match command {
Command::Left(x) => position = (position.strict_sub_unsigned(x.into())) % 100,
Command::Right(x) => position = (position.strict_add_unsigned(x.into())) % 100,
}
log::debug!("Position: {position:?}");
if position == 0 {
num_zeroes += 1;
log::debug!("Zeroes: {num_zeroes:?}");
}
}
num_zeroes
}
pub fn part_one(input: &str) -> Option<u64> {
let commands = parse_input(input)?;
Some(count_explicit_zeroes(commands))
}
fn count_all_zeroes(commands: Vec<Command>) -> u64 {
let mut position: i32 = 50;
let mut num_zeroes = 0;
for command in commands {
log::debug!("Command: {command:?}");
match command {
Command::Left(x) => position = (position.strict_sub_unsigned(x.into())),
Command::Right(x) => position = (position.strict_add_unsigned(x.into())),
}
log::debug!("Position: {position:?}");
if position >= 100 || position <= 0 {
num_zeroes += 1;
position = position % 100;
log::debug!("Zeroes: {num_zeroes:?}");
}
}
num_zeroes
}
pub fn part_two(input: &str) -> Option<u64> {
let commands = parse_input(input)?;
Some(count_all_zeroes(commands))
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_part_one() {
let result = part_one(&advent_of_code::template::read_file("examples", DAY));
assert_eq!(result, Some(3));
}
#[test]
fn test_part_two() {
let result = part_two(&advent_of_code::template::read_file("examples", DAY));
assert_eq!(result, None);
}
}

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@ -96,6 +96,7 @@ mod args {
}
fn main() {
env_logger::init();
match parse() {
Err(err) => {
eprintln!("Error: {err}");