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Day 1: Historian Hysteria

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[-] sjmulder@lemmy.sdf.org 1 points 2 weeks ago

JavaScript

After writing a procedural to-the-point version in C, tried a JavaScript solution too because it's just perfect for list comprehension. The part 2 search is inefficient but the data size is small.

Code

const fs = require("fs");
const U = require("./util");

const pairs = fs
    .readFileSync(process.argv[2] || process.stdin.fd, "utf8")
    .split("\n")
    .filter(x => x != "")
    .map(x => x.split(/ +/).map(Number));

const ls = pairs.map(x => x[0]); ls.sort();
const rs = pairs.map(x => x[1]); rs.sort();

const p1 = U.sum(ls.map((l, i) => Math.abs(l - rs[i])));
const p2 = U.sum(ls.map(l => l * U.count(rs, l)));

console.log("01:", p1, p2);

https://github.com/sjmulder/aoc/blob/master/2024/js/day01.js

this post was submitted on 01 Dec 2024
49 points (98.0% liked)

Advent Of Code

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