day1 and day2
This commit is contained in:
1
.gitignore
vendored
Normal file
1
.gitignore
vendored
Normal file
@@ -0,0 +1 @@
|
||||
/target
|
||||
290
Cargo.lock
generated
Normal file
290
Cargo.lock
generated
Normal file
@@ -0,0 +1,290 @@
|
||||
# This file is automatically @generated by Cargo.
|
||||
# It is not intended for manual editing.
|
||||
version = 3
|
||||
|
||||
[[package]]
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
"anstyle-parse",
|
||||
"anstyle-query",
|
||||
"anstyle-wincon",
|
||||
"colorchoice",
|
||||
"is_terminal_polyfill",
|
||||
"utf8parse",
|
||||
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|
||||
|
||||
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|
||||
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|
||||
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|
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|
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|
||||
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
|
||||
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|
||||
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|
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|
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|
||||
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|
||||
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|
||||
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|
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|
||||
|
||||
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||||
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|
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|
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|
||||
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|
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|
||||
|
||||
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|
||||
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|
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|
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|
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|
||||
|
||||
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|
||||
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|
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
|
||||
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|
||||
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|
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||||
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|
||||
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|
||||
"anstream",
|
||||
"anstyle",
|
||||
"clap_lex",
|
||||
"strsim",
|
||||
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|
||||
|
||||
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|
||||
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|
||||
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|
||||
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|
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|
||||
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|
||||
"heck",
|
||||
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|
||||
"quote",
|
||||
"syn",
|
||||
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|
||||
|
||||
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|
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|
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||||
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||||
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|
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|
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"proc-macro2",
|
||||
"quote",
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||||
"unicode-ident",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
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|
||||
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||||
"thiserror-impl",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "thiserror-impl"
|
||||
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||||
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||||
"proc-macro2",
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||||
"quote",
|
||||
"syn",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "unicode-ident"
|
||||
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|
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"windows-targets",
|
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|
||||
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||||
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||||
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|
||||
"windows_aarch64_msvc",
|
||||
"windows_i686_gnu",
|
||||
"windows_i686_gnullvm",
|
||||
"windows_i686_msvc",
|
||||
"windows_x86_64_gnu",
|
||||
"windows_x86_64_gnullvm",
|
||||
"windows_x86_64_msvc",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "windows_aarch64_gnullvm"
|
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|
||||
|
||||
[[package]]
|
||||
name = "windows_aarch64_msvc"
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|
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source = "registry+https://github.com/rust-lang/crates.io-index"
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|
||||
|
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|
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|
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||||
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|
||||
|
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[[package]]
|
||||
name = "windows_i686_gnullvm"
|
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|
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source = "registry+https://github.com/rust-lang/crates.io-index"
|
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name = "windows_i686_msvc"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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|
||||
|
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[[package]]
|
||||
name = "windows_x86_64_gnu"
|
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|
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source = "registry+https://github.com/rust-lang/crates.io-index"
|
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|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_gnullvm"
|
||||
version = "0.52.6"
|
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source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_msvc"
|
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version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
|
||||
9
Cargo.toml
Normal file
9
Cargo.toml
Normal file
@@ -0,0 +1,9 @@
|
||||
[package]
|
||||
name = "advent2024"
|
||||
version = "0.1.0"
|
||||
edition = "2021"
|
||||
|
||||
[dependencies]
|
||||
clap = { version = "4.5.21", features = ["derive"] }
|
||||
error-stack = "0.5.0"
|
||||
thiserror = "2.0.3"
|
||||
83
src/day1.rs
Normal file
83
src/day1.rs
Normal file
@@ -0,0 +1,83 @@
|
||||
use error_stack::ResultExt;
|
||||
use std::num::ParseIntError;
|
||||
use std::str::FromStr;
|
||||
use thiserror::Error;
|
||||
|
||||
#[derive(Debug, Error)]
|
||||
pub enum Error {
|
||||
#[error("Parsing error")]
|
||||
ParseError,
|
||||
}
|
||||
|
||||
pub fn run(buffer: String) -> error_stack::Result<(), Error> {
|
||||
let (mut lefts, mut rights) = parse_input(buffer).change_context(Error::ParseError)?;
|
||||
|
||||
lefts.sort();
|
||||
rights.sort();
|
||||
|
||||
let mut total_difference = 0;
|
||||
|
||||
for (left, right) in lefts.iter().zip(rights.iter()) {
|
||||
let delta = std::cmp::max(left, right) - std::cmp::min(left, right);
|
||||
total_difference += delta;
|
||||
}
|
||||
|
||||
println!(
|
||||
"The total difference of the sorted sets is {}",
|
||||
total_difference
|
||||
);
|
||||
|
||||
let mut similarity_score = 0;
|
||||
|
||||
for left in lefts.iter() {
|
||||
let mut count = 0;
|
||||
|
||||
for right in rights.iter() {
|
||||
if left == right {
|
||||
count += 1;
|
||||
}
|
||||
}
|
||||
|
||||
similarity_score += left * count;
|
||||
}
|
||||
|
||||
println!("The similarity score is {}", similarity_score);
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
#[derive(Debug, Error)]
|
||||
enum ParseError {
|
||||
#[error("Invalid left value: {0}")]
|
||||
InvalidLeftValue(ParseIntError),
|
||||
#[error("Invalid right value: {0}")]
|
||||
InvalidRightValue(ParseIntError),
|
||||
}
|
||||
|
||||
fn parse_input(buffer: String) -> error_stack::Result<(Vec<u64>, Vec<u64>), ParseError> {
|
||||
let mut lefts = vec![];
|
||||
let mut rights = vec![];
|
||||
|
||||
for (line_no, line) in buffer.lines().enumerate() {
|
||||
let Some((left, rest)) = line.split_once(" ") else {
|
||||
continue;
|
||||
};
|
||||
|
||||
let right = rest.trim();
|
||||
|
||||
let left_val = u64::from_str(left)
|
||||
.map_err(ParseError::InvalidLeftValue)
|
||||
.attach_printable(format!("on line {line_no}"))
|
||||
.attach_printable(format!("input value '{left}'"))?;
|
||||
|
||||
let right_val = u64::from_str(right)
|
||||
.map_err(ParseError::InvalidRightValue)
|
||||
.attach_printable(format!("on line {line_no}"))
|
||||
.attach_printable(format!("input value '{right}'"))?;
|
||||
|
||||
lefts.push(left_val);
|
||||
rights.push(right_val);
|
||||
}
|
||||
|
||||
Ok((lefts, rights))
|
||||
}
|
||||
106
src/day2.rs
Normal file
106
src/day2.rs
Normal file
@@ -0,0 +1,106 @@
|
||||
use error_stack::ResultExt;
|
||||
use std::num::ParseIntError;
|
||||
use std::str::FromStr;
|
||||
use thiserror::Error;
|
||||
|
||||
#[derive(Debug, Error)]
|
||||
pub enum Error {
|
||||
#[error("Parsing error")]
|
||||
ParseError,
|
||||
}
|
||||
|
||||
pub fn run(buffer: String) -> error_stack::Result<(), Error> {
|
||||
let readings = parse_input(buffer).change_context(Error::ParseError)?;
|
||||
|
||||
let mut safe_reports = 0;
|
||||
let mut dampened_reports = 0;
|
||||
|
||||
'outer: for reading in readings.iter() {
|
||||
if is_good_report(reading.iter().copied()) {
|
||||
safe_reports += 1;
|
||||
} else {
|
||||
for i in 0..reading.len() {
|
||||
let new_iter = reading
|
||||
.iter()
|
||||
.take(i)
|
||||
.chain(reading.iter().skip(i + 1))
|
||||
.copied();
|
||||
|
||||
if is_good_report(new_iter) {
|
||||
dampened_reports += 1;
|
||||
continue 'outer;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
println!("{} of {} reports are safe.", safe_reports, readings.len());
|
||||
println!(
|
||||
"{} of {} reports are safe or have one bad item.",
|
||||
safe_reports + dampened_reports,
|
||||
readings.len()
|
||||
);
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn is_good_report<I: Iterator<Item = u64>>(mut reading: I) -> bool {
|
||||
let Some(mut last) = reading.next() else {
|
||||
return true;
|
||||
};
|
||||
|
||||
let mut is_ascending = None;
|
||||
|
||||
for subsequent in reading {
|
||||
if std::cmp::max(subsequent, last) - std::cmp::min(subsequent, last) > 3 {
|
||||
return false;
|
||||
}
|
||||
|
||||
match is_ascending {
|
||||
None if subsequent > last => {
|
||||
is_ascending = Some(true);
|
||||
}
|
||||
|
||||
None if subsequent < last => {
|
||||
is_ascending = Some(false);
|
||||
}
|
||||
|
||||
None => return false,
|
||||
|
||||
Some(true) if subsequent <= last => return false,
|
||||
Some(false) if subsequent >= last => return false,
|
||||
Some(_) => {}
|
||||
}
|
||||
|
||||
last = subsequent;
|
||||
}
|
||||
|
||||
true
|
||||
}
|
||||
|
||||
#[derive(Debug, Error)]
|
||||
enum ParseError {
|
||||
#[error("Invalid numeric value: {0}")]
|
||||
InvalidNumericValue(ParseIntError),
|
||||
}
|
||||
|
||||
fn parse_input(buffer: String) -> error_stack::Result<Vec<Vec<u64>>, ParseError> {
|
||||
let mut result = vec![];
|
||||
|
||||
for (line_no, line) in buffer.lines().enumerate() {
|
||||
let mut items = vec![];
|
||||
|
||||
for item in line.split(" ") {
|
||||
let item_val = u64::from_str(item)
|
||||
.map_err(ParseError::InvalidNumericValue)
|
||||
.attach_printable(format!("on line {line_no}"))
|
||||
.attach_printable(format!("input value: '{item}'"))?;
|
||||
|
||||
items.push(item_val);
|
||||
}
|
||||
|
||||
result.push(items);
|
||||
}
|
||||
|
||||
Ok(result)
|
||||
}
|
||||
81
src/main.rs
Normal file
81
src/main.rs
Normal file
@@ -0,0 +1,81 @@
|
||||
mod day1;
|
||||
mod day2;
|
||||
|
||||
use clap::{Parser, Subcommand};
|
||||
use error_stack::{report, ResultExt};
|
||||
use std::path::PathBuf;
|
||||
use thiserror::Error;
|
||||
|
||||
#[derive(Debug, Parser)]
|
||||
struct Argument {
|
||||
#[command(subcommand)]
|
||||
day: Day,
|
||||
#[arg(short, long)]
|
||||
input: Option<PathBuf>,
|
||||
}
|
||||
|
||||
#[derive(Debug, Subcommand)]
|
||||
enum Day {
|
||||
/// Read in a data stream containing space-separated numbers, and compute
|
||||
/// the total difference between them once sorted, along with a similarity
|
||||
/// score
|
||||
Day1,
|
||||
/// Count how many readings from the RNR are safe
|
||||
Day2,
|
||||
}
|
||||
|
||||
#[derive(Debug, Error)]
|
||||
enum TopLevelError {
|
||||
#[error("Input file is not actually a file.")]
|
||||
NotActualFile,
|
||||
#[error("Failed to read input file")]
|
||||
InputReadError,
|
||||
#[error("Failed to read input from stdin (not input file given)")]
|
||||
StdinReadError,
|
||||
#[error("Failed to run day 1 code")]
|
||||
Day1,
|
||||
#[error("Failed to run day 2 code")]
|
||||
Day2,
|
||||
}
|
||||
|
||||
fn real_main(argument: Argument) -> error_stack::Result<(), TopLevelError> {
|
||||
let (input_buffer, input_attachment) = match argument.input {
|
||||
None => {
|
||||
let buffer = std::io::read_to_string(std::io::stdin())
|
||||
.map_err(|x| report!(TopLevelError::StdinReadError).attach_printable(x))?;
|
||||
|
||||
(buffer, "from standard input".to_string())
|
||||
}
|
||||
|
||||
Some(path) => {
|
||||
if !path.is_file() {
|
||||
return Err(report!(TopLevelError::NotActualFile))
|
||||
.attach_printable(format!("file path: {}", path.display()));
|
||||
}
|
||||
|
||||
let buffer = std::fs::read_to_string(&path).map_err(|x| {
|
||||
report!(TopLevelError::InputReadError)
|
||||
.attach_printable(format!("file path: {}", path.display()))
|
||||
.attach_printable(x)
|
||||
})?;
|
||||
|
||||
(buffer, format!("from input file {}", path.display()))
|
||||
}
|
||||
};
|
||||
|
||||
match argument.day {
|
||||
Day::Day1 => day1::run(input_buffer)
|
||||
.change_context(TopLevelError::Day1)
|
||||
.attach_printable(input_attachment),
|
||||
Day::Day2 => day2::run(input_buffer)
|
||||
.change_context(TopLevelError::Day2)
|
||||
.attach_printable(input_attachment),
|
||||
}
|
||||
}
|
||||
|
||||
fn main() {
|
||||
let argument = Argument::parse();
|
||||
if let Err(e) = real_main(argument) {
|
||||
eprintln!("ERROR: {}", e);
|
||||
}
|
||||
}
|
||||
6
tests/01_example
Normal file
6
tests/01_example
Normal file
@@ -0,0 +1,6 @@
|
||||
3 4
|
||||
4 3
|
||||
2 5
|
||||
1 3
|
||||
3 9
|
||||
3 3
|
||||
1000
tests/01_input1.txt
Normal file
1000
tests/01_input1.txt
Normal file
File diff suppressed because it is too large
Load Diff
6
tests/02_example
Normal file
6
tests/02_example
Normal file
@@ -0,0 +1,6 @@
|
||||
7 6 4 2 1
|
||||
1 2 7 8 9
|
||||
9 7 6 2 1
|
||||
1 3 2 4 5
|
||||
8 6 4 4 1
|
||||
1 3 6 7 9
|
||||
1000
tests/02_input.txt
Normal file
1000
tests/02_input.txt
Normal file
File diff suppressed because it is too large
Load Diff
Reference in New Issue
Block a user