56 lines
1.6 KiB
JavaScript
56 lines
1.6 KiB
JavaScript
import { readFileSync } from 'node:fs';
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const input = readFileSync('input', 'utf-8');
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const numbers = input
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.split('\n')
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.filter(line => !!line.trim())
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.map(num => parseInt(num));
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function getNextPos(pos, move, len) {
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if (move === 0) {
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return pos;
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} else if (move > 0) {
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return (pos + move) % (len - 1);
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} else {
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return (len - 1) - ((len - 1 - pos + Math.abs(move)) % (len - 1));
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}
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}
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function mix(numberArray, count=1) {
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const sequence = numberArray.map((move, sequence) => ({move, sequence}));
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for (let c = 0; c < count; c++) {
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for (let i = 0; i < sequence.length; i++) {
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const itemIndex = sequence.findIndex(item => item.sequence === i);
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const item = sequence[itemIndex];
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const newIndex = getNextPos(itemIndex, item.move, sequence.length);
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sequence.splice(itemIndex, 1);
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sequence.splice(newIndex, 0, item);
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}
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}
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return sequence.map(s => s.move);
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}
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function getCoordinates(mixed) {
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const zeroIndex = mixed.indexOf(0);
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const coordinates = (
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mixed[(zeroIndex + 1000) % (mixed.length)] +
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mixed[(zeroIndex + 2000) % (mixed.length)] +
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mixed[(zeroIndex + 3000) % (mixed.length)]
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);
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return coordinates;
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}
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const partOneMixed = mix(numbers);
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const partOneCoords = getCoordinates(partOneMixed);
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console.log('The sum of grove coordinates for part one is:', partOneCoords);
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const partTwoNumbers = numbers.map(n => n * 811589153);
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const partTwoMixed = mix(partTwoNumbers, 10);
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const partTwoCoords = getCoordinates(partTwoMixed);
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console.log('The sum of grove coordinates for part two is:', partTwoCoords);
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