AdventOfCode2020/Day 5/part1_2.js

const { max } = require("lodash")

const data = `BFFFBFFRLR
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BBFFFBFLRL
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BFBFBFBRLR
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FFBFFFFLLL
FFBBBFBRRL
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FBFBFBFLRR
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BBBFBFFRLL
BFFBFBBRRL
BFFBBBFRRR
BFFBBBBLRL
FBBFBFFRRL
FFBBFBFLLR
FBBBFBFRRR
BBFFFBFRRL
BFBBBFFLLL
BBFFBFFLRL
FFFBFFBRLL
FBFFFBFRRL
FBFFFBBLRR
FBFBBFBLLR
FBFFBFFRRL
BFBBBFBRLR
BFFFBBFRRL
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FBFFFBBLLL
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FFFBBBBRRL
BFBFFBBRRL
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BBFBBBBLRR
FBFBFBFLRL
BFFFBBBLRR
BFFBFBBRLR
BBFFFBFRLR
BBBFFFBRRR
BFBFFBBRLR
FBFBFBFRLR
FFBFBBBRLL
FBFFBBFLLR
BFBFFFBRRR
BFFBFBBLLL
BFBBBBFRLL
BBFBBFBRLL
BFBBFBBRRR
BFFBBFBRRR
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FFFBFBFRLR
BFFBBFFLLR
BBFBBBBRLR
FFFBFBBRLL
BFFBFFBRRL
BBBFFFFLRR
FBBBFFFRRL
BBFBBBBRRL
BFFFFBFLRR
BBFBBFFRLL
FBBFBFFRLR
FBFBBFFRRL
BFFFFFBRRR
BFFBBBBRLR
BFBFFBBRLL
FBFBBFBRRR
FFBFBBFRLL
FBFFFFBRRL
BFBFBFFLRL
BBFBBFFLRR
BFBBBFBRLL
FBFBBFFLRR
BFFFFBBRLL
BBBFBBBLLR
FBBFBFBRRL
BBFFFBFLLL
BFBBBFBRRL
BFFBFBFRLR
FFFBFBBLLR
FBBBFBFRLR
FBFFFFFLLR
BBBFFFBLRR
BBFBBFBLRL
BFBBBBBLRR
BFFBBBBRRL
FBBFFFBLRR
FBBBBBBLLL
BFBBBFBLRR
BFBBBBFLRR
BFBBBBBLRL
BFBBBBFLLR
FFFBBFBLLL
BBFBBFFRRL
FBBBBFBLRR
BBBFBFFRRR
BFBFBFBLRL
FBBBBBBLRR
BFFBFFBLRR
FFBBFBBLLL
BBBFBFBLLR
FBBBFFFLLL
BBBFBFFRLR
BFBBFBBRLR
FFBFFFBLRL
FFBFFFBLLL
FBBBBBFRRL
FFFBBFFLLR
FBFFFBFLRL
BFBBBBFRLR
BFBBFBBLRL
BFFFFFBLRR
FBBBBBFRLL
FFBFFFFLRL
FFFBFBBLRR`

const dataSet = data.split('\n')

function splitCharacters(line) {
    line = line.split('')
    return line
}

const map = dataSet.map(splitCharacters);
let answerArray = []

map.forEach(element => {
    function workOutRow(input) {
        if (input === 'F') {
            val = row.length / 2
            row = row.slice(0, val)
        } else {
            val = row.length / 2
            row = row.slice(val, row.length)
        }
    }

    function workOutColumn(input) {
        if (input === 'L') {
            val = column.length / 2
            column = column.slice(0, val)
        } else {
            val = column.length / 2
            column = column.slice(val, column.length)
        }
    }

    let row = Array.from({ length: 128 }, (x, i) => i);
    let column = Array.from({ length: 8 }, (x, i) => i);
    let val

    workOutRow(element[0])
    workOutRow(element[1])
    workOutRow(element[2])
    workOutRow(element[3])
    workOutRow(element[4])
    workOutRow(element[5])
    workOutRow(element[6])
    workOutColumn(element[7])
    workOutColumn(element[8])
    workOutColumn(element[9])
    let answer = row[0] * 8 + column[0]
    answerArray.push(answer)
})
console.log('Biggest ID= ' + Math.max(...answerArray));

let k = answerArray.sort((a, b) => a - b)

// Part 2
const lodash = require('lodash')

lodash.forEach(lodash.range(lodash.min(k), lodash.max(k)), (number, index) => {
    if (lodash.findIndex(k, val => val == number) == -1) {
        let answer = k[index] - 1
        console.log('My Seat= ' + answer)
    }
})