20 lines
831 B
JavaScript
20 lines
831 B
JavaScript
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const fs = require('fs');
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const file = fs.readFileSync(__dirname + '/input.txt').toString('utf-8');
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const arr = file.split('\n');
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let highestSeatID = 0;
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arr.forEach(seatIdentifier => {
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let rowInstructions = seatIdentifier.replace(/[L|R]/g, '').replace(/B/g, 1).replace(/F/g, 0).split('');
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let colInstructions = seatIdentifier.replace(/[F|B]/g, '').replace(/R/g, 1).replace(/L/g, 0).split('');
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let row = 128, col = 8, mR = row/2, mC = col/2;
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rowInstructions.forEach(bit => { bit == 1 ? null : row = row - mR ; mR/=2 });
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colInstructions.forEach(bit => { bit == 1 ? null : col = col - mC ; mC/=2 });
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row--; col--;
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let seatID = row * 8 + col;
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if (seatID > highestSeatID) highestSeatID = seatID;
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});
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console.log(`Total seats: ${arr.length}`);
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console.log(`Highest seat ID: ${highestSeatID}`);
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