70 lines
2.2 KiB
JavaScript
70 lines
2.2 KiB
JavaScript
const fs = require('fs');
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function parseInstructions(filePath) {
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try {
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const fileContent = fs.readFileSync(filePath, 'utf8');
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const lines = fileContent.trim().split('\n'); // Trim to remove extra newlines
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console.log(`Parsed ${lines.length} instructions from ${filePath}`);
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return lines;
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} catch (error) {
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console.error(`Error reading file ${filePath}: ${error}`);
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throw error;
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}
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}
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function calculateArea(lines) {
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const DIRECTIONS = [[0, 1], [1, 0], [0, -1], [-1, 0]];
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let points = [[0, 0]];
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let boundary = 0;
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for (const line of lines) {
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if (!line) continue; // Skip empty lines
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const color = line.split(' ').pop();
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const instructions = color.slice(2, -1);
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const directionIndex = parseInt(instructions.slice(-1), 16);
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const [dr, dc] = DIRECTIONS[directionIndex];
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const steps = parseInt(instructions.slice(0, -1), 16);
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boundary += steps;
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const [row, column] = points[points.length - 1];
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points.push([row + dr * steps, column + dc * steps]);
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}
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let area = 0;
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for (let i = 0; i < points.length; i++) {
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const [x1, y1] = points[i];
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const [x2, y2] = points[(i + 1) % points.length];
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area += x1 * y2 - x2 * y1;
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}
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return Math.abs(area) / 2 + Math.floor(boundary / 2) + 1;
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}
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function runTest(testFile, expectedResult) {
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const lines = parseInstructions(testFile);
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const calculatedArea = calculateArea(lines);
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if (calculatedArea !== expectedResult) {
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throw new Error(`Test failed, expected ${expectedResult}, got ${calculatedArea}`);
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}
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console.log(`Test passed, area: ${calculatedArea}`);
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}
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function main() {
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const testFile = "../test.txt";
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const inputFile = "../input.txt";
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const expectedTestArea = 952408144115; // Replace with the correct expected area for the test
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try {
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runTest(testFile, expectedTestArea);
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// Process actual puzzle input
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const lines = parseInstructions(inputFile);
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const area = calculateArea(lines);
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console.log(`Puzzle result (area): ${area}`);
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} catch (error) {
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console.error(`Execution halted due to error: ${error}`);
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}
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}
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main();
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