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# %NAME%
Welcome to the Advent of Code[^aoc] Kotlin project created by [%ACTOR%][github] using the [Advent of Code Kotlin Template][template] delivered by JetBrains.
In this repository, %ACTOR% is about to provide solutions for the puzzles using [Kotlin][kotlin] language.
If you're stuck with Kotlin-specific questions or anything related to this template, check out the following resources:
- [Kotlin docs][docs]
- [Kotlin Slack][slack]
- Template [issue tracker][issues]
[^aoc]:
[Advent of Code][aoc] – An annual event of Christmas-oriented programming challenges started December 2015.
Every year since then, beginning on the first day of December, a programming puzzle is published every day for twenty-five days.
You can solve the puzzle and provide an answer using the language of your choice.
[aoc]: https://adventofcode.com
[docs]: https://kotlinlang.org/docs/home.html
[github]: https://github.com/%ACTOR%
[issues]: https://github.com/kotlin-hands-on/advent-of-code-kotlin-template/issues
[kotlin]: https://kotlinlang.org
[slack]: https://surveys.jetbrains.com/s3/kotlin-slack-sign-up
[template]: https://github.com/kotlin-hands-on/advent-of-code-kotlin-template

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rootProject.name = "%NAME%"
dependencyResolutionManagement {
repositories {
mavenCentral()
}
}

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# GitHub Actions Workflow responsible for cleaning up the Advent of Code Kotlin Template repository from
# the template-specific files and configurations. This workflow is supposed to be triggered automatically
# when a new template-based repository has been created.
name: Template Cleanup
on:
push:
branches: [main]
jobs:
# Run cleaning process only if workflow is triggered by the non-"advent-of-code-kotlin-template" repository.
template-cleanup:
name: Template Cleanup
runs-on: ubuntu-latest
if: github.event.repository.name != 'advent-of-code-kotlin-template'
permissions:
contents: write
steps:
# Check out current repository
- name: Fetch Sources
uses: actions/checkout@v4
# Cleanup project
- name: Cleanup
run: |
export LC_CTYPE=C
export LANG=C
# Prepare variables
NAME="${GITHUB_REPOSITORY##*/}"
ACTOR=$(echo $GITHUB_ACTOR | tr '[:upper:]' '[:lower:]')
SAFE_NAME=$(echo $NAME | sed 's/[^a-zA-Z0-9]//g' | tr '[:upper:]' '[:lower:]')
SAFE_ACTOR=$(echo $ACTOR | sed 's/[^a-zA-Z0-9]//g' | tr '[:upper:]' '[:lower:]')
GROUP="com.github.$SAFE_ACTOR.$SAFE_NAME"
# Replace placeholders in the template-cleanup files
sed -i "s/%ACTOR%/$ACTOR/g" .github/template-cleanup/*
sed -i "s/%NAME%/$NAME/g" .github/template-cleanup/*
sed -i "s/%REPOSITORY%/${GITHUB_REPOSITORY/\//\\/}/g" .github/template-cleanup/*
sed -i "s/%GROUP%/$GROUP/g" .github/template-cleanup/*
# Move content
cp -R .github/template-cleanup/* .
# Cleanup
rm -rf \
.github/readme \
.github/template-cleanup \
.github/workflows/template-cleanup.yml \
LICENSE
# Remove leftover empty directories
find . -type d -empty -delete
# Commit modified files
- name: Commit files
run: |
git config --local user.email "action@github.com"
git config --local user.name "GitHub Action"
git add .
git commit -m "Template cleanup"
# Push changes
- name: Push changes
uses: ad-m/github-push-action@master
with:
branch: main
github_token: ${{ secrets.GITHUB_TOKEN }}

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.gradle
.idea
.kotlin/
build
src/**/*.txt
local.properties

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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="ExportableFileTemplateSettings">
<default_templates>
<template name="Advent of Code.kt" file-name="Day${Day}" reformat="true" live-template-enabled="true">
<template name="Advent of Code.kt.child.0.txt" file-name="Day${Day}" reformat="true" live-template-enabled="false" />
</template>
<template name="Advent of Code.kt.child.0.txt" file-name="Day${Day}" reformat="true" live-template-enabled="false" />
</default_templates>
</component>
</project>

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#set( $Code = "bar" )
fun main() {
fun part1(input: List<String>): Int {
return input.size
}
fun part2(input: List<String>): Int {
return input.size
}
check(part1(listOf("...")) == 1)
val input = readInput("Day$Day")
part1(input).println()
part2(input).println()
}

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# Advent of Code Kotlin Template
[Advent of Code][aoc] – an annual event in December since 2015.
Every year since then, with the first day of December, a programming puzzles contest is published every day for twenty-five days.
A set of Christmas-oriented challenges provides any input you have to use to answer using the language of your choice.
We offer you a template prepared to use with [Kotlin][kotlin] language within this repository.
![][file:cover]
## Live Streams
Join us as we solve the Advent of Code challenges live on stream!
Follow along to see step-by-step solutions, participate in problem-solving, and learn new strategies to tackle the puzzles.
Whether you're stuck on a particular problem or just looking to improve your Kotlin skills, our live streams are here to help.
[Watch the live streams here!][youtube-playlist]
[![][file:livestream]][youtube-playlist]
## Workflow
**Advent of Code Kotlin Template** is a particular type of GitHub repository that lets you speed up the setup phase and start writing your AoC solutions immediately.
The general idea is straightforward – to create a new project based on this template, you need to log in to your GitHub account and use the **Use this template** green button.
And remember – **do not fork it!**
After creating a new project based on this template in your account, a dedicated GitHub Actions workflow will start and clean up the code from redundant files.
It will also personalize code to use your username and project name in namespaces and Gradle properties.
How cool is that?
You can clone it within the IntelliJ IDEA whenever the [@actions-user][actions-user] actor pushes the second commit to your repository.
> [!IMPORTANT]
>
> Right after opening the project in IntelliJ IDEA, verify if you use at least **Java 11** as Project SDK.
> To do that, visit [Project Structure Settings][docs-project-structure] (<kbd>⌘ Cmd</kbd><kbd>;</kbd> on macOS or <kbd>Ctrl</kbd><kbd>Alt</kbd><kbd>Shift</kbd><kbd>S</kbd> on Windows/Linux).
From now on, everything's in your hands!
Join the [Advent of Code][aoc] contest to solve the *Day 01* as soon as it is published.
Copy the `Day01.kt` solution file for the following days and increment the day number.
> [!NOTE]
>
> Remember to join the Kotlin contest!
>
> To do that, edit your project's _About_ section with ⚙️ icon and add the `aoc-2024-in-kotlin` topic to your project.
>
> **We will find your repository and count you in our giveaway.**
## Setup
After you create a new project based on the current template repository using the **Use this template** button, a bare minimal scaffold will appear in your GitHub account with the following structure:
```
.
├── README.md README file
├── build.gradle.kts Gradle configuration created with Kotlin DSL
├── settings.gradle.kts Gradle project settings
├── gradle* Gradle wrapper files
└── src
├── Day01.kt An empty implementation for the first AoC day
├── Utils.kt A set of utility methods shared across your days
│
│ (create those files manually)
├── Day01.txt An empty file for the Day 01 input data
└── Day01_test.txt An optional Day 01 test input data used for checks
```
> [!NOTE]
>
> All task input files (`src/*.txt`) are excluded from the repository with `.gitignore` – we should not post them publicly, as [Eric Wastl requested for](https://twitter.com/ericwastl/status/1465805354214830081).
When the first puzzle appears, go to the `Day01.kt`, and for each `part1` and `part2` function, provide an algorithm implementation using the `input` data loaded from the `src/Day01.txt` file.
This input data is common for both parts, and you can find it at the bottom of each day on the [Advent of Code][aoc] page.
To read the input data, you can go with the `readInput(name: String)` utility method provided in the [`Utils.kt`][file:utils] file, like:
```kotlin
fun main() {
fun part1(input: List<String>): Int {
return input.size
}
val input = readInput("Day01")
println(part1(input))
}
```
## Running
To call the algorithm you're implementing, click the green Play button next to the `fun main()` definition.
![img.png](.github/readme/run.png)
> [!IMPORTANT]
>
> Create relevant files Before running tasks or tests, like: `src/Day01.txt` or `src/Day01_test.txt`.
The [`Utils.kt`][file:utils] file also contains the `String.md5()` method for generating MD5 hash out of the given string and expects more helper functions for the sake of the [KISS principle][kiss].
Each puzzle describes some test conditions, a small portion of the information that helps check if the produced value for the given test input is valid.
To handle that case, you can put such an input into a separate file and perform a check against the output, like:
```kotlin
fun main() {
// ...
val testInput = readInput("Day01_test")
check(part1(testInput) == 13)
}
```
The current approach of providing both `part1` and `part2` solutions within the single `Day##.kt` file may sometimes bring a disadvantage due to the first solution calculation when we expect to work on the second part only.
With simple cases that don't consume too much of your time and resources that can be almost unnoticeable, but when the solution takes seconds, it is worth considering breaking the daily solution into two separated pieces, like `Day07_part1.kt` and `Day07_part2.kt`.
The final result of your algorithm will be printed on the screen so that you can pass it to the Advent of Code website.
To go with the next day, place the `Day02.txt` file into the `src` with relevant input data and create a `Day02.kt` file with a similar code scaffold:
```kotlin
fun main() {
fun part1(input: List<String>): Int {
return 0
}
fun part2(input: List<String>): Int {
return 0
}
val input = readInput("Day02")
println(part1(input))
println(part2(input))
}
```
> [!NOTE]
>
> There is a fork of this repository available that utilizes the Amper tool for project configuration, recently [introduced by JetBrains][amper].
>
> For more, see [Advent of Code Kotlin Template — Amper][amper-template] project.
## Getting help
If you are stuck with Kotlin-specific questions or anything related to this template, check out the following resources:
- [Kotlin docs][docs]
- [Kotlin Slack][slack]
- Template [issue tracker][issues]
[actions-user]: https://github.com/actions-user
[aoc]: https://adventofcode.com
[amper]: https://blog.jetbrains.com/blog/2023/11/09/amper-improving-the-build-tooling-user-experience/
[amper-template]: https://github.com/kotlin-hands-on/advent-of-code-kotlin-template-amper
[docs]: https://kotlinlang.org/docs/home.html
[docs-project-structure]: https://www.jetbrains.com/help/idea/project-settings-and-structure.html
[issues]: https://github.com/kotlin-hands-on/advent-of-code-kotlin-template/issues
[kiss]: https://en.wikipedia.org/wiki/KISS_principle
[kotlin]: https://kotlinlang.org
[slack]: https://surveys.jetbrains.com/s3/kotlin-slack-sign-up
[file:cover]: .github/readme/cover.png
[file:livestream]: .github/readme/livestream.png
[file:utils]: src/Utils.kt
[youtube-playlist]: https://www.youtube.com/playlist?list=PLlFc5cFwUnmwHaD3-qeoLHnho_PY2g9JX

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plugins {
kotlin("jvm") version "2.1.0"
}
sourceSets {
main {
kotlin.srcDir("src")
}
}
tasks {
wrapper {
gradleVersion = "8.11.1"
}
}

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distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-8.11.1-bin.zip
networkTimeout=10000
validateDistributionUrl=true
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists

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#!/bin/sh
#
# Copyright © 2015-2021 the original authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# SPDX-License-Identifier: Apache-2.0
#
##############################################################################
#
# Gradle start up script for POSIX generated by Gradle.
#
# Important for running:
#
# (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
# noncompliant, but you have some other compliant shell such as ksh or
# bash, then to run this script, type that shell name before the whole
# command line, like:
#
# ksh Gradle
#
# Busybox and similar reduced shells will NOT work, because this script
# requires all of these POSIX shell features:
# * functions;
# * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
# «${var#prefix}», «${var%suffix}», and «$( cmd )»;
# * compound commands having a testable exit status, especially «case»;
# * various built-in commands including «command», «set», and «ulimit».
#
# Important for patching:
#
# (2) This script targets any POSIX shell, so it avoids extensions provided
# by Bash, Ksh, etc; in particular arrays are avoided.
#
# The "traditional" practice of packing multiple parameters into a
# space-separated string is a well documented source of bugs and security
# problems, so this is (mostly) avoided, by progressively accumulating
# options in "$@", and eventually passing that to Java.
#
# Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
# and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
# see the in-line comments for details.
#
# There are tweaks for specific operating systems such as AIX, CygWin,
# Darwin, MinGW, and NonStop.
#
# (3) This script is generated from the Groovy template
# https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
# within the Gradle project.
#
# You can find Gradle at https://github.com/gradle/gradle/.
#
##############################################################################
# Attempt to set APP_HOME
# Resolve links: $0 may be a link
app_path=$0
# Need this for daisy-chained symlinks.
while
APP_HOME=${app_path%"${app_path##*/}"} # leaves a trailing /; empty if no leading path
[ -h "$app_path" ]
do
ls=$( ls -ld "$app_path" )
link=${ls#*' -> '}
case $link in #(
/*) app_path=$link ;; #(
*) app_path=$APP_HOME$link ;;
esac
done
# This is normally unused
# shellcheck disable=SC2034
APP_BASE_NAME=${0##*/}
# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s
' "$PWD" ) || exit
# Use the maximum available, or set MAX_FD != -1 to use that value.
MAX_FD=maximum
warn () {
echo "$*"
} >&2
die () {
echo
echo "$*"
echo
exit 1
} >&2
# OS specific support (must be 'true' or 'false').
cygwin=false
msys=false
darwin=false
nonstop=false
case "$( uname )" in #(
CYGWIN* ) cygwin=true ;; #(
Darwin* ) darwin=true ;; #(
MSYS* | MINGW* ) msys=true ;; #(
NONSTOP* ) nonstop=true ;;
esac
CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
# Determine the Java command to use to start the JVM.
if [ -n "$JAVA_HOME" ] ; then
if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
# IBM's JDK on AIX uses strange locations for the executables
JAVACMD=$JAVA_HOME/jre/sh/java
else
JAVACMD=$JAVA_HOME/bin/java
fi
if [ ! -x "$JAVACMD" ] ; then
die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
else
JAVACMD=java
if ! command -v java >/dev/null 2>&1
then
die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
fi
# Increase the maximum file descriptors if we can.
if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
case $MAX_FD in #(
max*)
# In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
# shellcheck disable=SC2039,SC3045
MAX_FD=$( ulimit -H -n ) ||
warn "Could not query maximum file descriptor limit"
esac
case $MAX_FD in #(
'' | soft) :;; #(
*)
# In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
# shellcheck disable=SC2039,SC3045
ulimit -n "$MAX_FD" ||
warn "Could not set maximum file descriptor limit to $MAX_FD"
esac
fi
# Collect all arguments for the java command, stacking in reverse order:
# * args from the command line
# * the main class name
# * -classpath
# * -D...appname settings
# * --module-path (only if needed)
# * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
# For Cygwin or MSYS, switch paths to Windows format before running java
if "$cygwin" || "$msys" ; then
APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
JAVACMD=$( cygpath --unix "$JAVACMD" )
# Now convert the arguments - kludge to limit ourselves to /bin/sh
for arg do
if
case $arg in #(
-*) false ;; # don't mess with options #(
/?*) t=${arg#/} t=/${t%%/*} # looks like a POSIX filepath
[ -e "$t" ] ;; #(
*) false ;;
esac
then
arg=$( cygpath --path --ignore --mixed "$arg" )
fi
# Roll the args list around exactly as many times as the number of
# args, so each arg winds up back in the position where it started, but
# possibly modified.
#
# NB: a `for` loop captures its iteration list before it begins, so
# changing the positional parameters here affects neither the number of
# iterations, nor the values presented in `arg`.
shift # remove old arg
set -- "$@" "$arg" # push replacement arg
done
fi
# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
# Collect all arguments for the java command:
# * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
# and any embedded shellness will be escaped.
# * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
# treated as '${Hostname}' itself on the command line.
set -- \
"-Dorg.gradle.appname=$APP_BASE_NAME" \
-classpath "$CLASSPATH" \
org.gradle.wrapper.GradleWrapperMain \
"$@"
# Stop when "xargs" is not available.
if ! command -v xargs >/dev/null 2>&1
then
die "xargs is not available"
fi
# Use "xargs" to parse quoted args.
#
# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
#
# In Bash we could simply go:
#
# readarray ARGS < <( xargs -n1 <<<"$var" ) &&
# set -- "${ARGS[@]}" "$@"
#
# but POSIX shell has neither arrays nor command substitution, so instead we
# post-process each arg (as a line of input to sed) to backslash-escape any
# character that might be a shell metacharacter, then use eval to reverse
# that process (while maintaining the separation between arguments), and wrap
# the whole thing up as a single "set" statement.
#
# This will of course break if any of these variables contains a newline or
# an unmatched quote.
#
eval "set -- $(
printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
xargs -n1 |
sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
tr '\n' ' '
)" '"$@"'
exec "$JAVACMD" "$@"

94
gradlew.bat vendored Normal file
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@ -0,0 +1,94 @@
@rem
@rem Copyright 2015 the original author or authors.
@rem
@rem Licensed under the Apache License, Version 2.0 (the "License");
@rem you may not use this file except in compliance with the License.
@rem You may obtain a copy of the License at
@rem
@rem https://www.apache.org/licenses/LICENSE-2.0
@rem
@rem Unless required by applicable law or agreed to in writing, software
@rem distributed under the License is distributed on an "AS IS" BASIS,
@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@rem See the License for the specific language governing permissions and
@rem limitations under the License.
@rem
@rem SPDX-License-Identifier: Apache-2.0
@rem
@if "%DEBUG%"=="" @echo off
@rem ##########################################################################
@rem
@rem Gradle startup script for Windows
@rem
@rem ##########################################################################
@rem Set local scope for the variables with windows NT shell
if "%OS%"=="Windows_NT" setlocal
set DIRNAME=%~dp0
if "%DIRNAME%"=="" set DIRNAME=.
@rem This is normally unused
set APP_BASE_NAME=%~n0
set APP_HOME=%DIRNAME%
@rem Resolve any "." and ".." in APP_HOME to make it shorter.
for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
@rem Find java.exe
if defined JAVA_HOME goto findJavaFromJavaHome
set JAVA_EXE=java.exe
%JAVA_EXE% -version >NUL 2>&1
if %ERRORLEVEL% equ 0 goto execute
echo. 1>&2
echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
echo. 1>&2
echo Please set the JAVA_HOME variable in your environment to match the 1>&2
echo location of your Java installation. 1>&2
goto fail
:findJavaFromJavaHome
set JAVA_HOME=%JAVA_HOME:"=%
set JAVA_EXE=%JAVA_HOME%/bin/java.exe
if exist "%JAVA_EXE%" goto execute
echo. 1>&2
echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
echo. 1>&2
echo Please set the JAVA_HOME variable in your environment to match the 1>&2
echo location of your Java installation. 1>&2
goto fail
:execute
@rem Setup the command line
set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
@rem Execute Gradle
"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
:end
@rem End local scope for the variables with windows NT shell
if %ERRORLEVEL% equ 0 goto mainEnd
:fail
rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
rem the _cmd.exe /c_ return code!
set EXIT_CODE=%ERRORLEVEL%
if %EXIT_CODE% equ 0 set EXIT_CODE=1
if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
exit /b %EXIT_CODE%
:mainEnd
if "%OS%"=="Windows_NT" endlocal
:omega

7
settings.gradle.kts Normal file
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rootProject.name = "Advent of Code Kotlin Template"
dependencyResolutionManagement {
repositories {
mavenCentral()
}
}

21
src/Day01.kt Normal file
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fun main() {
fun part1(input: List<String>): Int {
return input.size
}
fun part2(input: List<String>): Int {
return input.size
}
// Test if implementation meets criteria from the description, like:
check(part1(listOf("test_input")) == 1)
// Or read a large test input from the `src/Day01_test.txt` file:
val testInput = readInput("Day01_test")
check(part1(testInput) == 1)
// Read the input from the `src/Day01.txt` file.
val input = readInput("Day01")
part1(input).println()
part2(input).println()
}

21
src/Utils.kt Normal file
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import java.math.BigInteger
import java.security.MessageDigest
import kotlin.io.path.Path
import kotlin.io.path.readText
/**
* Reads lines from the given input txt file.
*/
fun readInput(name: String) = Path("src/$name.txt").readText().trim().lines()
/**
* Converts string to md5 hash.
*/
fun String.md5() = BigInteger(1, MessageDigest.getInstance("MD5").digest(toByteArray()))
.toString(16)
.padStart(32, '0')
/**
* The cleaner shorthand for printing output.
*/
fun Any?.println() = println(this)