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const data = require('./data')
const tiles = []
const getSides = (t) => {
const sides = [t[0], t.map(r=>r[r.length-1]).join(''), t[t.length-1], t.map(r=>r[0]).join('')]
const reversed = sides.map(s => s.split("").reverse().join(""))
return [...sides, ...reversed]
}
data
.split('\n\n')
.map(s => s.split('\n').filter(Boolean))
.forEach(s => tiles.push({
id: parseInt(s[0].match(/[0-9]+/g)[0]),
array: s.slice(1),
sides: getSides(s.slice(1)),
matches: []
}))
const check = (t1, t2) => {
for (const s1 of t1.sides) for (const s2 of t2.sides) {
if (s1 === s2) {return s1}
}
return null
}
for (let i=0; i< tiles.length; i++) for (let j=i+1; j<tiles.length; j++) {
const match = check(tiles[i], tiles[j])
if (match) {
tiles[i].matches.push({ id: tiles[j].id, side: match })
tiles[j].matches.push({ id: tiles[i].id, side: match })
}
}
const res = tiles
.filter(t => t.matches.length === 2)
.map(t => t.id)
.reduce((a, b) => a * b, 1)
console.log('Answer: ', res)
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