2022-18 in js

.gitignore

@@ -1 +1,3 @@
 zig-cache
+node_modules
+package-lock.json

2022/18-Boiling-Boulders/.eslintrc.json

@@ -0,0 +1,44 @@
+{
+	"env": {
+		"es2021": true,
+		"node": true
+	},
+	"extends": [
+		"eslint:recommended",
+		"plugin:node/recommended"
+	],
+	"overrides": [
+		{
+			"files": ["*.js"],
+			"rules": {
+				"no-constant-condition": "off"
+			}
+		}
+	],
+	"parserOptions": {
+		"ecmaVersion": "latest",
+		"sourceType": "module"
+	},
+	"rules": {
+		"indent": [
+			"error",
+			"tab"
+		],
+		"linebreak-style": [
+			"error",
+			"unix"
+		],
+		"quotes": [
+			"error",
+			"double"
+		],
+		"semi": [
+			"error",
+			"always"
+		],
+		"node/no-unsupported-features/es-syntax": [
+			"error",
+			{ "ignores": ["modules"] }
+		]
+	}
+}

2022/18-Boiling-Boulders/example

@@ -0,0 +1,13 @@
+2,2,2
+1,2,2
+3,2,2
+2,1,2
+2,3,2
+2,2,1
+2,2,3
+2,2,4
+2,2,6
+1,2,5
+3,2,5
+2,1,5
+2,3,5

2022/18-Boiling-Boulders/first.js

@@ -0,0 +1,38 @@
+import * as fs from "fs";
+
+function load(filename) {
+	return fs.readFileSync(filename, "utf8")
+		.trim()
+		.split("\n");
+}
+
+let example = load("example");
+let input = load("input");
+
+function countSides(cube, input) {
+	let [x, y, z] = cube.split(",").map(n => parseInt(n));
+	let count = 6;
+	if (input.includes([x+1, y, z].join(","))) count--;
+	if (input.includes([x-1, y, z].join(","))) count--;
+	if (input.includes([x, y+1, z].join(","))) count--;
+	if (input.includes([x, y-1, z].join(","))) count--;
+	if (input.includes([x, y, z+1].join(","))) count--;
+	if (input.includes([x, y, z-1].join(","))) count--;
+	return count;
+}
+
+function solve(input) {
+	let count = 0;
+	input.forEach(cube => {
+		count += countSides(cube, input);
+	});
+	return count;
+}
+
+const exampleOutput = solve(example);
+if (exampleOutput !== 64) {
+	console.log("Example failed with " + exampleOutput);
+	process.exit(1); // eslint-disable-line
+}
+
+console.log(solve(input));

2022/18-Boiling-Boulders/package.json

@@ -0,0 +1,8 @@
+{
+	"type": "module",
+	"dependencies": {
+		"eslint": "^8.30.0",
+		"eslint-plugin-node": "^11.1.0",
+		"jslint": "^0.12.1"
+	}
+}

2022/18-Boiling-Boulders/second.js

@@ -0,0 +1,63 @@
+import * as fs from "fs";
+
+function load(filename) {
+	return fs.readFileSync(filename, "utf8")
+		.trim()
+		.split("\n");
+}
+
+let example = load("example");
+let input = load("input");
+
+function countSides(x, y, z, input) {
+	let count = 0;
+	if (input.includes([x+1, y, z].join(","))) count++;
+	if (input.includes([x-1, y, z].join(","))) count++;
+	if (input.includes([x, y+1, z].join(","))) count++;
+	if (input.includes([x, y-1, z].join(","))) count++;
+	if (input.includes([x, y, z+1].join(","))) count++;
+	if (input.includes([x, y, z-1].join(","))) count++;
+	return count;
+}
+
+function solve(input) {
+	// compute the boundaries of the playing field
+	let min = Infinity;
+	let max = -Infinity;
+	input.forEach(line => {
+		let [x, y, z] = line.split(",").map(n => parseInt(n));
+		min = Math.min(min, x, y, z);
+		max = Math.max(max, x, y, z);
+	})
+	min -=1;
+	max +=1;
+	// start with an edge and fill up the space
+	let count = 0;
+	let queue = [[min, min, min]];
+	let visited = new Set();
+	while (queue.length > 0) {
+		const elt = queue.shift();
+		const eltstr = elt.join(",");
+		const [x, y, z] = elt;
+		if (x < min || x > max || y < min || y > max || z < min || z > max) continue;
+		if (visited.has(eltstr)) continue
+		if (input.includes(eltstr)) continue;
+		visited.add(eltstr);
+		count += countSides(x, y, z, input);
+		queue.push([x+1, y, z]);
+		queue.push([x-1, y, z]);
+		queue.push([x, y+1, z]);
+		queue.push([x, y-1, z]);
+		queue.push([x, y, z+1]);
+		queue.push([x, y, z-1]);
+	}
+	return count;
+}
+
+const exampleOutput = solve(example);
+if (exampleOutput !== 58) {
+	console.log("Example failed with " + exampleOutput);
+	process.exit(1); // eslint-disable-line
+}
+
+console.log(solve(input));