47 lines
1.0 KiB
JavaScript
47 lines
1.0 KiB
JavaScript
// TODO: not very efficient because i was lazy
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function day12(input, part2) {
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let cxns = input.split("\n").map((line) => line.split("-"))
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let dict = {}
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for (let cxn of cxns) {
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dict[cxn[0]] = [...(dict[cxn[0]] || []), cxn[1]]
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dict[cxn[1]] = [...(dict[cxn[1]] || []), cxn[0]]
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}
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let count = 0
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let paths = [["start"]]
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while (paths.length) {
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let newPaths = []
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for (let path of paths) {
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for (let next of dict[path.last]) {
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if (next == "start") {
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continue
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}
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let newPath = [...path, next]
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if (newPath.count((e, i, a) => e == e.toLowerCase() && a.indexOf(e) != i) > part2) {
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continue
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}
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if (next == "end") {
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count++
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} else {
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newPaths.push(newPath)
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}
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}
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}
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paths = newPaths
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}
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return count
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}
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if (typeof window == "undefined") {
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module.exports = day12
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}
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