93 lines
2.3 KiB
JavaScript
93 lines
2.3 KiB
JavaScript
import * as R from "remeda";
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import u from "updeep";
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import Graph from 'graphology';
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import { bidirectional } from 'graphology-shortest-path';
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import { combinations, permutations } from "combinatorial-generators";
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import { readFile } from "../05/part1.js";
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const parseLine = (line) => {
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const { groups } = line.match(/Valve (?<valve>..).*flow rate=(?<flow>\d+).*valves? (?<exits>.*)/);
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return [groups.valve, {
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exits: groups.exits.split(',').map(x => x.trim()),
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flow: parseInt(groups.flow)
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}]
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}
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const readInput = (...args) =>
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R.pipe(
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readFile(...args),
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(lines) => lines.split("\n"),
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R.compact, // remove last line
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R.map(parseLine),
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Object.fromEntries,
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);
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export const puzzleInput = readInput(import.meta.url, "input");
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export const sample = readInput(import.meta.url, "sample");
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function finalSteam(tunnels, graph, minutesLeft, possibilities, location = 'AA', activeSteam = 0) {
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//console.log(minutesLeft, totalSteam, itinary);
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if (minutesLeft <= 0) return 0;
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if (possibilities.length === 0) return minutesLeft * activeSteam;
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let scores = [];
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for ( const next of possibilities ) {
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const path = bidirectional(graph, location, next);
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//console.log(path);
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let time = path.length;
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if (time >= minutesLeft) {
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scores.push( minutesLeft * activeSteam );
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}
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else {
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//console.log({totalSteam, time, activeSteam});
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let ts = time * activeSteam;
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let as = activeSteam + tunnels[next].flow;
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scores.push(
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ts + finalSteam(
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tunnels, graph, minutesLeft - time,
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possibilities.filter( x => x !== next ),
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next,
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as
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)
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)
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}
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}
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return Math.max( ...scores );
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}
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export const buildGraph = tunnels => {
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const graph = new Graph();
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Object.keys(tunnels).forEach(x => graph.addNode(x));
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Object.entries(tunnels).forEach(([location, { exits }]) => {
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exits.forEach(exit => graph.addEdge(location, exit));
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});
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return graph;
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};
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export default (tunnels) => {
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const possibilities =
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Object.keys(tunnels).filter(
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k => tunnels[k].flow
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);
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const graph = buildGraph(tunnels);
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return finalSteam(tunnels, graph, 30, possibilities, 'AA', 0, 0)
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};
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