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const data = require('./data')
const ranges = data
.split('\nyour ticket:')[0]
.split(/\n/g)
.filter(r => r)
.map(r => ({[r.split(': ')[0]]: r.split(': ')[1].split(' or ').map(s => s.split('-').map(a => parseInt(a)))}))
.reduce((c, n) => ({ ...c, ...n}), {})
const your = data
.split('your ticket:\n')[1]
.split('nearby tickets:\n')[0]
.split(',')
.map(n => parseInt(n.replace(/\n/g,'')))
const nearby = data
.split('nearby tickets:\n')[1]
.split(/\n/g)
.filter(n => n)
.map(n => n.split(',').map(nr => parseInt(nr)))
.filter(n => n.every(nr => Object.values(ranges).some(r => r.some(ra => nr >= ra[0] && nr <= ra[1] ))))
const nearbyColumns = Array(nearby[0].length).fill([])
nearby.forEach((n) => {
n.forEach((num, i) => {
nearbyColumns[i] = [ ...nearbyColumns[i], num]
})
})
const ids = {}
const keys = Object.keys(ranges)
keys.forEach(key => {
ids[key] = []
nearbyColumns.filter((col, id) => {
const check = col.every(n => ranges[key].some(r => n >= r[0] && n <= r[1]))
if (check) { ids[key].push(id) }
return check
})
});
const simplify = (arr) => {
if (arr.every(a => a.length === 1)) {
return arr
} else {
const singles = arr.filter(a => a.length === 1).map(a => a[0])
const newArr = arr.map(a => a.filter(n => !singles.includes(n) || a.length === 1))
return simplify(newArr)
}
}
const result = simplify(Object.values(ids))
.filter((v,i) => Object.keys(ids)[i].startsWith('departure'))
.map(d => your[d[0]])
.reduce((a,b) => a * b, 1)
console.log('Answer: ', result)
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