84 lines
2.2 KiB
JavaScript
84 lines
2.2 KiB
JavaScript
import * as R from "remeda";
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import { passthru } from "../08/part1.js";
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import { readFile } from "../05/part1.js";
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import V from '@yanick/vyktor';
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import { createLogger } from "vite";
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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(line => line.match(/x=-?.*?y=-?\d+/g).map(str =>
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str.match(/-?\d+/g).map(x => parseInt(x))).map(
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coords => V(coords)
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)
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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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/** @returns [number,number][] */
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const mergeRanges = ( ranges ) =>
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ranges.reduce( (accum,range) => {
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if( accum.length === 0 ) return [ range ];
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if( R.last( accum )[1] < range[0] ) {
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accum.push(range);
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}
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else {
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R.last(accum)[1] = Math.max(
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R.last(accum)[1], range[1]
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)
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}
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return accum;
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}, [] );
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const spy = passthru( x => console.log(x) );
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const entriesInRange = (targetLine,entries) => {
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entries = R.uniqBy(entries.map(([_,beacon])=>beacon).filter( beacon => beacon?.y === targetLine ), (x) => x.toString());
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console.log(entries);
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return range => {
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return entries.filter(
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entry => (entry.x >= range[0]) && (entry.x <= range[1])
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).length
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}
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};
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export const unbeaconAtLine = targetLine => entries => R.pipe(
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entries,
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R.map( ([x,y]) => [ x, x.manhattanDistance(y) ] ),
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R.filter(
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e => (
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( e[0].y - e[1] <= targetLine) &&
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( e[0].y + e[1] >= targetLine)
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)
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),
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R.map(
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e => {
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const l = e[1] - Math.abs(targetLine - e[0].y);
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return [
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e[0].x - l,
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e[0].x + l ]
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}
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),
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spy,
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(ranges) =>
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ranges.sort( (a,b) => {
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return (a[0] - b[0]) || (a[1]-b[1]);
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} )
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,
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spy,
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mergeRanges,
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spy,
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R.sumBy( range => range[1] - range[0] + 1 - entriesInRange(targetLine,entries)(range) )
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);
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export default unbeaconAtLine(2000000);
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