#!/bin/node

const fs = require('fs');

fs.readFile('input.txt', (err, data) => {
    const seats = data.toString()
        .split('\n')
        .filter(l => l.length > 0)
        .map(s => s.replaceAll(/[BR]/g, '1')
            .replaceAll(/[FL]/g, '0'))
        .map(s => parseInt(s, 2));

    console.log('Highest seat:', seats.reduce((a, v) => v > a ? v : a, -1));

    seats.sort();
    for (let i = 0; i < seats.length; i++) {
        const seat = seats[i];
        const nextSeat = seats[i + 1];
        if (nextSeat - seat === 2) {
            console.log('Your seat:', seat + 1);
            break;
        }
    }
});