Initial project setup + Day 1

.gitignore

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+
+# Created by https://www.gitignore.io/api/maven,kotlin,intellij
+# Edit at https://www.gitignore.io/?templates=maven,kotlin,intellij
+
+### Intellij ###
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and WebStorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# Generated files
+.idea/**/contentModel.xml
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+auto-import.
+.idea/modules.xml
+.idea/*.iml
+.idea/modules
+*.iml
+*.ipr
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+.idea/**/mongoSettings.xml
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# Editor-based Rest Client
+.idea/httpRequests
+
+# Android studio 3.1+ serialized cache file
+.idea/caches/build_file_checksums.ser
+
+### Intellij Patch ###
+# Comment Reason: https://github.com/joeblau/gitignore.io/issues/186#issuecomment-215987721
+
+modules.xml
+.idea/misc.xml
+
+# Sonarlint plugin
+.idea/**/sonarlint/
+
+# SonarQube Plugin
+.idea/**/sonarIssues.xml
+
+# Markdown Navigator plugin
+.idea/**/markdown-navigator.xml
+.idea/**/markdown-navigator/
+
+### Kotlin ###
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+### Maven ###
+target/
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+release.properties
+dependency-reduced-pom.xml
+buildNumber.properties
+.mvn/timing.properties
+.mvn/wrapper/maven-wrapper.jar
+.flattened-pom.xml
+
+# End of https://www.gitignore.io/api/maven,kotlin,intellij

.idea/.gitignore

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+# Default ignored files
+/workspace.xml

.idea/.name

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+adventofcode2019

.idea/codeStyles/Project.xml

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+<component name="ProjectCodeStyleConfiguration">
+  <code_scheme name="Project" version="173">
+    <JetCodeStyleSettings>
+      <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
+    </JetCodeStyleSettings>
+    <codeStyleSettings language="kotlin">
+      <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
+    </codeStyleSettings>
+  </code_scheme>
+</component>

.idea/codeStyles/codeStyleConfig.xml

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+<component name="ProjectCodeStyleConfiguration">
+  <state>
+    <option name="USE_PER_PROJECT_SETTINGS" value="true" />
+  </state>
+</component>

.idea/compiler.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <annotationProcessing>
+      <profile name="Maven default annotation processors profile" enabled="true">
+        <sourceOutputDir name="target/generated-sources/annotations" />
+        <sourceTestOutputDir name="target/generated-test-sources/test-annotations" />
+        <outputRelativeToContentRoot value="true" />
+        <module name="advent-of-code2019" />
+      </profile>
+    </annotationProcessing>
+  </component>
+</project>

.idea/encodings.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding">
+    <file url="file://$PROJECT_DIR$" charset="UTF-8" />
+  </component>
+</project>

.idea/vcs.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.basdado.adventofcode</groupId>
+    <artifactId>advent-of-code-2019</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+
+    <name>com.basdado.adventofcode advent-of-code-2019</name>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <kotlin.version>1.3.61</kotlin.version>
+        <kotlin.code.style>official</kotlin.code.style>
+        <junit.version>4.12</junit.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.jetbrains.kotlin</groupId>
+            <artifactId>kotlin-stdlib</artifactId>
+            <version>${kotlin.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.jetbrains.kotlin</groupId>
+            <artifactId>kotlin-test-junit</artifactId>
+            <version>${kotlin.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>${junit.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <sourceDirectory>src/main/kotlin</sourceDirectory>
+        <testSourceDirectory>src/test/kotlin</testSourceDirectory>
+
+        <plugins>
+            <plugin>
+                <groupId>org.jetbrains.kotlin</groupId>
+                <artifactId>kotlin-maven-plugin</artifactId>
+                <version>${kotlin.version}</version>
+                <executions>
+                    <execution>
+                        <id>compile</id>
+                        <phase>compile</phase>
+                        <goals>
+                            <goal>compile</goal>
+                        </goals>
+                    </execution>
+                    <execution>
+                        <id>test-compile</id>
+                        <phase>test-compile</phase>
+                        <goals>
+                            <goal>test-compile</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

src/main/kotlin/com/basdado/adventofcode/Utils.kt

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+package com.basdado.adventofcode
+
+import java.nio.file.Files
+import java.nio.file.Paths
+import java.util.stream.Stream
+
+fun lines(resourceFile: String): Stream<String> {
+    return Files.lines(Paths.get(Utils::class.java.getResource(resourceFile).toURI()))
+}
+
+class Utils

src/main/kotlin/com/basdado/adventofcode/day1/Day1.kt

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+package com.basdado.adventofcode.day1
+
+import com.basdado.adventofcode.lines
+
+const val DAY1_PATH = "/day/1/input.txt"
+
+fun main(args: Array<String>) {
+    println(Day1.puzzle1())
+    println(Day1.puzzle2())
+}
+
+object Day1 {
+
+    fun puzzle1(): Long {
+        return lines(DAY1_PATH)
+            .filter { !it.isBlank() }
+            .mapToLong { it.toLong() }
+            .map { (it / 3) - 2 }
+            .sum()
+    }
+
+    fun puzzle2(): Long {
+        return lines(DAY1_PATH)
+            .filter { !it.isBlank() }
+            .mapToLong { it.toLong() }
+            .map { (it / 3) - 2 }
+            .map { it + calculateFuelFuel(it) }
+            .sum()
+    }
+
+    private fun calculateFuelFuel(initialFuel: Long): Long {
+        var currentFuel = initialFuel
+        var sum = 0L
+        while (currentFuel > 8) {
+            currentFuel = currentFuel / 3 - 2
+            sum += currentFuel
+        }
+        return sum
+    }
+}

src/main/resources/day/1/input.txt

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+66626
+95053
+84365
+111504
+97412
+124986
+133224
+60267
+68096
+120910
+105547
+138575
+112841
+113102
+92387
+83511
+62646
+98974
+138093
+59417
+137854
+78318
+143846
+81514
+86217
+98493
+82056
+129376
+61322
+51045
+115467
+106540
+149439
+141253
+65608
+130480
+79444
+80032
+101908
+105695
+145502
+87538
+68817
+128768
+148784
+115464
+147306
+148666
+118258
+82755
+68422
+98333
+105334
+120963
+89349
+78675
+99151
+61383
+81549
+106544
+72880
+88152
+110879
+91277
+123584
+78430
+51658
+126045
+93833
+52535
+130831
+130920
+80069
+140263
+50943
+63503
+116135
+112686
+67582
+83515
+128736
+136447
+69998
+72472
+61009
+136054
+124675
+134813
+149765
+132135
+127787
+148333
+78020
+94212
+81407
+58994
+146820
+66603
+62761
+86955