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Torben2000Torben2000
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Initial version with 2 demo days form 2019
Change-Id: Id6449c6e4f65d927a85bafd0c4528487562c6000
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9 files changed

+321
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‎.gitignore

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# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
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hs_err_pid*
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#IntelliJ
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*.iml
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.idea
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#target folder
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target/

‎README.md

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# adventofcode2020
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# adventofcode2020
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Based on https://github.com/dave-burke/advent-of-code-java-starter/

‎pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>de.beachboys</groupId>
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<artifactId>adventofcode2020</artifactId>
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<version>1.0-SNAPSHOT</version>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<configuration>
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<source>9</source>
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<target>9</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<properties>
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<maven.compiler.target>11</maven.compiler.target>
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<maven.compiler.source>11</maven.compiler.source>
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</properties>
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</project>

‎src/main/java/de/beachboys/Day.java

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package de.beachboys;
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import java.util.List;
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public interface Day {
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String part1(List<String> input);
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String part2(List<String> input);
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}

‎src/main/java/de/beachboys/Day01.java

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package de.beachboys;
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import java.io.FileInputStream;
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import java.util.List;
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import java.util.stream.Collectors;
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public class Day01 implements Day {
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public String part1(List<String> input) {
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return Integer.valueOf(input.stream().mapToInt(Integer::valueOf).map(x -> x / 3 - 2).reduce(0, Integer::sum)).toString();
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}
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public String part2(List<String> input) {
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return Integer.valueOf(input.stream().mapToInt(Integer::valueOf).map(this::calculateFuel).reduce(0, Integer::sum)).toString();
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}
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private int calculateFuel(int i) {
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int totalFuel = 0;
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int currentValue = i;
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while (true) {
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currentValue = currentValue / 3 - 2;
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if (currentValue <= 0)
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break;
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totalFuel += currentValue;
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}
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return totalFuel;
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}
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}

‎src/main/java/de/beachboys/Day02.java

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package de.beachboys;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.List;
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import java.util.stream.Collectors;
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public class Day02 implements Day {
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public String part1(List<String> input) {
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String realInput = input.get(0);
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String[] stringArray = realInput.split(",");
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List<Integer> list = Arrays.stream(stringArray).map(Integer::valueOf).collect(Collectors.toList());
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runLogic(list);
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System.out.println("Complete list + " + list.toString());
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return list.get(0) + "";
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}
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private void runLogic(List<Integer> list) {
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int currentIndex = 0;
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int opcode = 0;
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while(opcode != 99) {
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opcode = list.get(currentIndex);
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switch (opcode) {
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case 99:
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//
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break;
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case 1:
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int result = list.get(list.get(currentIndex + 1)) + list.get(list.get(currentIndex + 2));
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int setIndex = list.get(currentIndex + 3);
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if (setIndex < list.size()) {
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list.set(setIndex, result);
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}
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break;
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case 2:
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int result2 = list.get(list.get(currentIndex + 1)) * list.get(list.get(currentIndex + 2));
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int setIndex2 = list.get(currentIndex + 3);
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if (setIndex2 < list.size()) {
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list.set(setIndex2, result2);
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}
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break;
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default:
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}
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currentIndex += 4;
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}
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}
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public String part2(List<String> input) {
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String realInput = input.get(0);
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String[] stringArray = realInput.split(",");
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List<Integer> list = Arrays.stream(stringArray).map(Integer::valueOf).collect(Collectors.toList());
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List<Integer> listNew = list;
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for (int i = 0; i<100; i++) {
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for (int j = 0; j< 100; j++) {
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listNew = new ArrayList<>(list);
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listNew.set(1, i);
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listNew.set(2, j);
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try {
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runLogic(listNew);
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if (listNew.get(0) == 19690720) {
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return (listNew.get(1)*100+listNew.get(2)) + "";
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}
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} catch (Exception e) {
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}
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}
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}
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return "error";
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}
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}

‎src/main/java/de/beachboys/Runner.java

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package de.beachboys;
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import java.io.*;
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import java.util.*;
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import java.util.function.Function;
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import static java.util.stream.Collectors.toList;
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public class Runner {
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public static int CURRENT_DAY = 2;
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public static int CURRENT_PART = 1;
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public static final Map<Integer, Day> DAYS = new HashMap<>();
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static {
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DAYS.put(1, new Day01());
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DAYS.put(2, new Day02());
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}
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public static void main(String[] args) {
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System.out.println("Current day: " + CURRENT_DAY + ", current part: " + CURRENT_PART);
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Function<List<String>, String> currentPart;
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if (CURRENT_PART == 1) {
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currentPart = DAYS.get(CURRENT_DAY)::part1;
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} else {
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currentPart = DAYS.get(CURRENT_DAY)::part2;
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}
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Scanner in = new Scanner(System.in);
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while (true) {
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System.out.println("Testinput (q to exit, d to download, r to use real data): ");
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String input = in.nextLine();
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switch (input) {
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case "q":
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System.exit(0);
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break;
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case "d":
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downloadInput();
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break;
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case "r":
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System.out.println(currentPart.apply(loadInputLines()));
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break;
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default:
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System.out.println(currentPart.apply(List.of(input)));
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break;
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}
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}
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}
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private static void downloadInput() {
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// TODO
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}
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private static List<String> loadInputLines(){
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String paddedDay = String.valueOf(CURRENT_DAY);
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if(CURRENT_DAY < 10) {
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paddedDay = "0" + CURRENT_DAY;
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}
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String fileName = "day" + paddedDay + ".txt";
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try(BufferedReader r = new BufferedReader(new InputStreamReader(ClassLoader.getSystemResourceAsStream(fileName)))){
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return r.lines().collect(toList());
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} catch(IOException e){
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throw new UncheckedIOException(e);
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}
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}
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}

‎src/main/resources/day01.txt

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103910
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133712
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82560
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91679
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98354
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89007
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93288
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132363
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91373
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83666
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55958
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90387
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100869
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98127
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120197
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86931
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60370
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143999
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71541
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115662
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51287
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81624
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58307
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60408
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141664
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89781
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127772
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132353
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101220
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104001
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140488
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58072
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75764
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120003
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82386
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77603
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130604
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86672
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120987
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80334
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67674
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52918
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98041
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102541
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97612
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50436
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129998
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84854
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101867
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82039
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108966
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80708
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54588
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86854
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89607
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71869
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126093
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89460
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86558
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77651
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53295
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132188
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137266
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97370
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114620
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86691
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147199
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147299
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72616
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142654
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88610
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104030
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64256
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54867
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76532
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145081
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102335
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72987
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72684
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148155
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59739
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85954
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141001
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125171
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107764
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141622
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89536
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92435
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69038
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84518
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119700
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119801
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81677
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125317
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72683
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128905
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93666
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75633
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117361
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82295

‎src/main/resources/day02.txt

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1,12,2,3,1,1,2,3,1,3,4,3,1,5,0,3,2,1,6,19,1,9,19,23,2,23,10,27,1,27,5,31,1,31,6,35,1,6,35,39,2,39,13,43,1,9,43,47,2,9,47,51,1,51,6,55,2,55,10,59,1,59,5,63,2,10,63,67,2,9,67,71,1,71,5,75,2,10,75,79,1,79,6,83,2,10,83,87,1,5,87,91,2,9,91,95,1,95,5,99,1,99,2,103,1,103,13,0,99,2,14,0,0

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