splitInput = {
const [stacks, instructions] = input.split(emptyLine)
return {stacks, instructions}
}
stacks = parseStacks(splitInput.stacks)
instructions = R.map(parseInstruction, splitInput.instructions.split('\n'))
applyInstruction = (stacks, {count, from, to}) => {
R.range(0, count).forEach(() => {
stacks[to - 1].push(stacks[from - 1].pop())
})
return stacks
}
reorder = f => R.reduce(f, R.clone(stacks), instructions)
getTop = stacks => stacks.map(R.last).join('')
finalTopMost = getTop(reorder(applyInstruction))
applyInstruction9001 = (stacks, {count, from, to}) => {
const source = stacks[from - 1]
const [remaining, moved] = R.splitAt(source.length - count, source)
stacks[from - 1] = remaining
stacks[to - 1].push(...moved)
return stacks
}
finalTopMost9001 = getTop(reorder(applyInstruction9001))
emptyLine = /\n\s*\n/
parseStacks = text => {
const lines = text.split(/\n/).filter(x => x.startsWith('['))
const stacks = lines.map(line => line.replace(/ /g, ' []').split(/\s/).map(crate => crate.replace(/[\[\]]/g, '')))
return R.map(R.pipe(R.reverse, R.filter(R.identity)), R.transpose(stacks))
}
instructionRegex = /move (?<count>\d+) from (?<from>\d+) to (?<to>\d+)/
parseInstruction = line => R.map(parseInt, instructionRegex.exec(line).groups)
R = import('ramda')
import {adventOfCodeHeader, renderInput} from '@senritsu/advent-of-code-2022'
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