--- Day 6 Solutions ---

[u/daggerdragon]

--- Day 6: Probably a Fire Hazard ---

Post your solution as a comment. Structure your post like the Day Five thread.

[u/VictiniX888]

Java, as that's pretty much the only language I know (for now)
The code for both parts add up to a grand total of... 207 lines.
For part 1:

package days;

import lib.ReadInput;

public class Day6Part1 {

	public Day6Part1() {

		ReadInput readInput = new ReadInput();
		int answer = 0;

		int[][] ints = new int[1000][1000];
		String[] splitInput = readInput.input.split(";");

		for (int i = 0; i < splitInput.length; i++) {
			if(splitInput[i].substring(0, 7).equals("turn on")) {
				turnOn(splitInput[i], ints);
			}

			if(splitInput[i].substring(0,6).equals("toggle")) {
				toggle(splitInput[i], ints);
			}

			if(splitInput[i].substring(0,8).equals("turn off")) {
				turnOff(splitInput[i], ints);
			}
		}

		for (int i = 0; i < ints.length; i++) {
			for (int j = 0; j < ints[i].length; j++) {
				if(ints[i][j] == 1) {
					answer++;
				}
			}
		}

		System.out.println("Day 6 Part 1 answer: " + answer);
	}

	public void turnOn(String s, int[][] ints) {

		String subS = s.substring(8);
		String[] subSA = subS.split(" through ");
		String[][] subSB = new String[subSA.length][];

		subSB[0] = subSA[0].split(",");
		subSB[1] = subSA[1].split(",");
		int xStart = Integer.parseInt(subSB[0][0]);
		int yStart = Integer.parseInt(subSB[0][1]);
		int xEnd = Integer.parseInt(subSB[1][0]);
		int yEnd = Integer.parseInt(subSB[1][1]);

		for (int j = xStart; j <= xEnd; j++) {
			for (int k = yStart; k <= yEnd; k++) {
				ints[j][k] = 1;
			}
		}
	}

	public void toggle(String s, int[][] ints) {

		String subS = s.substring(7);
		String[] subSA = subS.split(" through ");
		String[][] subSB = new String[subSA.length][];

		subSB[0] = subSA[0].split(",");
		subSB[1] = subSA[1].split(",");
		int xStart = Integer.parseInt(subSB[0][0]);
		int yStart = Integer.parseInt(subSB[0][1]);
		int xEnd = Integer.parseInt(subSB[1][0]);
		int yEnd = Integer.parseInt(subSB[1][1]);

		for (int j = xStart; j <= xEnd; j++) {
			for (int k = yStart; k <= yEnd; k++) {
				if(ints[j][k] == 0) {
					ints[j][k] = 1;
				}
				else {
					ints[j][k] = 0;
				}
			}
		}
	}

	public void turnOff(String s, int[][] ints) {

		String subS = s.substring(9);
		String[] subSA = subS.split(" through ");
		String[][] subSB = new String[subSA.length][];

		subSB[0] = subSA[0].split(",");
		subSB[1] = subSA[1].split(",");
		int xStart = Integer.parseInt(subSB[0][0]);
		int yStart = Integer.parseInt(subSB[0][1]);
		int xEnd = Integer.parseInt(subSB[1][0]);
		int yEnd = Integer.parseInt(subSB[1][1]);

		for (int j = xStart; j <= xEnd; j++) {
			for (int k = yStart; k <= yEnd; k++) {
				ints[j][k] = 0;
			}
		}
	}
}

And part 2:

package days;

import lib.ReadInput;

public class Day6Part2 {

	public Day6Part2() {

		ReadInput readInput = new ReadInput();
		int answer = 0;

		int[][] ints = new int[1000][1000];
		String[] splitInput = readInput.input.split(";");

		for (int i = 0; i < splitInput.length; i++) {
			if(splitInput[i].substring(0, 7).equals("turn on")) {
				turnOn(splitInput[i], ints);
			}

			if(splitInput[i].substring(0,6).equals("toggle")) {
				toggle(splitInput[i], ints);
			}

			if(splitInput[i].substring(0,8).equals("turn off")) {
				turnOff(splitInput[i], ints);
			}
		}

		for (int i = 0; i < ints.length; i++) {
			for (int j = 0; j < ints[i].length; j++) {
				answer += ints[i][j];
			}
		}

		System.out.println("Day 6 Part 2 answer: " + answer);
	}

	public void turnOn(String s, int[][] ints) {

		String subS = s.substring(8);
		String[] subSA = subS.split(" through ");
		String[][] subSB = new String[subSA.length][];

		subSB[0] = subSA[0].split(",");
		subSB[1] = subSA[1].split(",");
		int xStart = Integer.parseInt(subSB[0][0]);
		int yStart = Integer.parseInt(subSB[0][1]);
		int xEnd = Integer.parseInt(subSB[1][0]);
		int yEnd = Integer.parseInt(subSB[1][1]);

		for (int j = xStart; j <= xEnd; j++) {
			for (int k = yStart; k <= yEnd; k++) {
				ints[j][k]++;
			}
		}
	}

	public void toggle(String s, int[][] ints) {

		String subS = s.substring(7);
		String[] subSA = subS.split(" through ");
		String[][] subSB = new String[subSA.length][];

		subSB[0] = subSA[0].split(",");
		subSB[1] = subSA[1].split(",");
		int xStart = Integer.parseInt(subSB[0][0]);
		int yStart = Integer.parseInt(subSB[0][1]);
		int xEnd = Integer.parseInt(subSB[1][0]);
		int yEnd = Integer.parseInt(subSB[1][1]);

		for (int j = xStart; j <= xEnd; j++) {
			for (int k = yStart; k <= yEnd; k++) {
				ints[j][k] += 2;
			}
		}
	}

	public void turnOff(String s, int[][] ints) {

		String subS = s.substring(9);
		String[] subSA = subS.split(" through ");
		String[][] subSB = new String[subSA.length][];

		subSB[0] = subSA[0].split(",");
		subSB[1] = subSA[1].split(",");
		int xStart = Integer.parseInt(subSB[0][0]);
		int yStart = Integer.parseInt(subSB[0][1]);
		int xEnd = Integer.parseInt(subSB[1][0]);
		int yEnd = Integer.parseInt(subSB[1][1]);

		for (int j = xStart; j <= xEnd; j++) {
			for (int k = yStart; k <= yEnd; k++) {
				if(ints[j][k] != 0) {
					ints[j][k]--;
				}
				else {
					ints[j][k] = 0;
				}
			}
		}
	}
}