Day01 2021

2021/build.gradle.kts

@@ -0,0 +1,18 @@
+plugins {
+    id("kotlin-convention")
+    kotlin("kapt")
+}
+
+dependencies {
+    implementation(project(":utils"))
+
+    kapt(Libs.Micronaut.processor)
+
+    implementation(Libs.Slf4J.api)
+    runtimeOnly(Libs.Slf4J.simple)
+
+    implementation(Libs.eclipseCollections)
+
+    testImplementation(Libs.Jmh.core)
+    kaptTest(Libs.Jmh.processor)
+}

2021/src/main/kotlin/Day01.kt

@@ -0,0 +1,28 @@
+package be.vandewalleh.aoc.days
+
+import be.vandewalleh.aoc.utils.input.Day
+import be.vandewalleh.aoc.utils.input.Input
+import be.vandewalleh.aoc.utils.input.Lines
+
+@Day(1)
+class Day01(@Lines input: Input<IntArray>) {
+    private val items = input.value
+
+    fun part1(): Int {
+        var count = 0
+        for (i in 0 until items.size - 1) {
+            if (items[i] < items[i + 1]) count++
+        }
+        return count
+    }
+
+    fun part2(): Int {
+        var count = 0
+        for (i in 0 until items.size - 3) {
+            val a = items.drop(i).take(3).sum()
+            val b = items.drop(i + 1).take(3).sum()
+            if (b > a) count++
+        }
+        return count
+    }
+}

2021/src/main/kotlin/Main.kt

@@ -0,0 +1,7 @@
+package be.vandewalleh.aoc.days
+
+import be.vandewalleh.aoc.utils.factory.createDay
+
+fun main() = with(createDay<Day01>()) {
+    println(part2())
+}

build.gradle.kts

@@ -3,6 +3,5 @@ plugins {
 }
 
 adventOfCode {
-    year = 2020
     session = file(".session").readText().trim()
 }

buildSrc/src/main/kotlin/AdventOfCodeDownloaderPlugin.kt

@@ -10,7 +10,6 @@ import org.gradle.kotlin.dsl.getByType
 
 open class AdventOfCodeExtension {
     var session: String? = null
-    var year: Int = 2020
 }
 
 class AdventOfCodeDownloaderPlugin : Plugin<Project> {
@@ -26,8 +25,12 @@ class AdventOfCodeDownloaderPlugin : Plugin<Project> {
                     throw GradleException("advent of code session not set")
                 }
 
+                val now = LocalDateTime.now()
+                val year = now.year
+                val currentDay = now.dayOfMonth.toString()
+
                 val resourceDir: File = project
-                    .project(":days")
+                    .project(":$year")
                     .extensions
                     .getByType<SourceSetContainer>()
                     .getByName("main")
@@ -35,9 +38,9 @@ class AdventOfCodeDownloaderPlugin : Plugin<Project> {
                     .srcDirs
                     .first()
 
-                val currentDay = LocalDateTime.now().dayOfMonth.toString()
+
                 val outFile = File(resourceDir, "day" + currentDay.padStart(length = 2, padChar = '0') + ".txt")
-                val url = "https://adventofcode.com/${extension.year}/day/$currentDay/input"
+                val url = "https://adventofcode.com/$year/day/$currentDay/input"
 
                 Unirest.get(url)
                     .cookie("session", extension.session)

settings.gradle.kts

@@ -1,4 +1,5 @@
 rootProject.name = "Advent of Code"
 include("utils")
-include("2020")
 include("2019")
+include("2020")
+include("2021")