AdventOfCode/JS/day10/solution_b.mjs
Tobias Berger a20a6fe438
JavaScript Day 10
Signed-off-by: Tobias Berger <tobi.berger13@gmail.com>
2022-12-01 13:26:32 +01:00

40 lines
866 B
JavaScript

import fs from "fs";
/**
* Main function for Puzzle B
*
* @param {string} data - Puzzle input as a single string.
*/
async function main(data) {
const joltages = data
.split(/\r?\n/)
.map((line) => parseInt(line))
.sort((a, b) => a - b)
.reverse();
const maxVal = joltages[0] + 3;
joltages.push(0);
joltages.unshift(maxVal);
const poss = {};
const len = [];
len[maxVal] = 1;
joltages.forEach((joltage) => {
poss[joltage] = joltages.filter(
(val) => val > joltage && val <= joltage + 3
);
if (joltage !== maxVal) {
len[joltage] = 0;
for (let i = 0; i < poss[joltage].length; i++) {
len[joltage] += len[poss[joltage][i]];
}
}
});
return len[0];
}
fs.readFile("input", (err, data) => {
if (err) throw err;
main(data.toString()).then(console.log).catch(console.error);
});