Merge pull request #1 from LovinLifee/master

day 1 code

Author: Doppeey

.gitignore

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+
+# Created by https://www.gitignore.io/api/java,eclipse,intellij
+# Edit at https://www.gitignore.io/?templates=java,eclipse,intellij
+
+### Eclipse ###
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+*.tmp
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+*~.nib
+local.properties
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+# External tool builders
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+# End of https://www.gitignore.io/api/java,eclipse,intellij

resources/Day1Inputs.txt

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+143845
+86139
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resources/Day2Inputs.txt

@@ -0,0 +1 @@
+1,0,0,3,1,1,2,3,1,3,4,3,1,5,0,3,2,1,10,19,1,19,5,23,1,6,23,27,1,27,5,31,2,31,10,35,2,35,6,39,1,39,5,43,2,43,9,47,1,47,6,51,1,13,51,55,2,9,55,59,1,59,13,63,1,6,63,67,2,67,10,71,1,9,71,75,2,75,6,79,1,79,5,83,1,83,5,87,2,9,87,91,2,9,91,95,1,95,10,99,1,9,99,103,2,103,6,107,2,9,107,111,1,111,5,115,2,6,115,119,1,5,119,123,1,123,2,127,1,127,9,0,99,2,0,14,0

src/com/togetherjava/adventofcode/Day1.java

@@ -0,0 +1,29 @@
+package com.togetherjava.adventofcode;
+
+import java.util.function.Supplier;
+import java.util.stream.Stream;
+
+import com.togetherjava.adventofcode.util.ResourceLoader;
+
+public class Day1 {
+
+	public static void main(String[] args) {
+		Supplier<Stream<Double>> input = () -> ResourceLoader.getInput("Day1Inputs.txt").stream().map(Double::parseDouble);
+		double part1 = input.get().map(Day1::calculateFuel).reduce(0D, Double::sum);
+		double part2 = input.get().map(Day1::recursiveCalculateFuel).reduce(0D, Double::sum);
+		System.out.println("Part 1 answer: " + part1);
+		System.out.println("Part 2 answer: " + part2);
+	}
+
+	public static double recursiveCalculateFuel(double mass) {
+		double fuel = calculateFuel(mass);
+		if (fuel <= 0) {
+			return 0D;
+		}
+		return fuel + recursiveCalculateFuel(fuel);
+	}
+
+	public static double calculateFuel(double mass) {
+		return Math.floor(mass / 3.0) - 2;
+	}
+}

src/com/togetherjava/adventofcode/Day2.java

@@ -0,0 +1,60 @@
+package com.togetherjava.adventofcode;
+
+import java.util.Arrays;
+
+import com.togetherjava.adventofcode.util.ResourceLoader;
+
+public class Day2 {
+
+	public static void main(String[] args) {
+		String[] input = ResourceLoader.getInput("Day2Inputs.txt").get(0).split(",");
+		int[] data = new int[input.length];
+		for (int i = 0; i < data.length; i++) {
+			data[i] = Integer.parseInt(input[i]);
+		}
+		System.out.println("Part 1)");
+		int[] part1 = Arrays.copyOf(data, data.length);
+		//part 1 noun = 2 verb = 12
+		System.out.println(calculate(part1, 12, 2)[0]);
+		for(int verb = 0; verb < 100; verb++) {
+			for(int noun = 0; noun < 100; noun++) {
+				int[] part2 = Arrays.copyOf(data, data.length);
+				int[] temp = calculate(part2, noun, verb);
+				if(temp[0] == 19690720) {
+					System.out.println("Part 2)");
+					System.out.printf("FOUND NOUN = %d VERB = %d\n", noun, verb);
+					System.out.printf("100 * %d + %d = %d", noun, verb, 100 * noun + verb);
+				}
+			}
+		}
+	}
+	
+	public static int[] calculate(int[] data, int noun, int verb) {
+		data[1] = noun;
+		data[2] = verb;
+		int i = 0;
+		while (i < data.length) {
+			int opcode = data[i];
+			if (opcode == 1) {
+				int aPosition = data[i + 1];
+				int bPosition = data[i + 2];
+				int positionToStore = data[i + 3];
+				int a = data[aPosition];
+				int b = data[bPosition];
+				data[positionToStore] = a + b;
+				i += 4;
+			} else if (opcode == 2) {
+				int aPosition = data[i + 1];
+				int bPosition = data[i + 2];
+				int positionToStore = data[i + 3];
+				int a = data[aPosition];
+				int b = data[bPosition];
+				data[positionToStore] = a * b;
+				i += 4;
+			} else if (opcode == 99) {
+				break;
+			}
+		}
+		return data;
+	}
+}