AoC-23/Day5/Part1.js
2023-12-08 11:25:33 +01:00

48 lines
1.2 KiB
JavaScript

import { readFileSync } from "fs";
const t0 = performance.now();
const categories = readFileSync("input.txt")
.toString()
.split("\n\n")
.filter((e) => e.length > 0);
const seeds = categories[0]
.split(" ")
.slice(1)
.map((e) => parseInt(e));
const dictionaries = categories.slice(1).map((e) => {
const splits = e.split("\n").filter((e) => e.length > 0);
const name = splits[0].replace(" map:", "");
const maps = splits.slice(1).map((a) =>
a
.split(" ")
.filter((b) => b.length > 0)
.map((c) => parseInt(c))
);
const filter = (j) => maps.reduce((a, i) => [...a, i[j]], []);
return {
name,
ranges: {
destination: filter(0),
source: filter(1),
length: filter(2),
},
};
});
const locations = seeds.map((e) =>
dictionaries.reduce((a, i, j) => {
const current = j === 0 ? e : a;
return (
i.ranges.source.reduce((b, p, k) => {
const next = current - p;
const inRange = next >= 0 && next <= i.ranges.length[k];
return inRange ? i.ranges.destination[k] + next : b;
}, null) ?? current
);
}, 0)
);
const closest = locations.reduce((a, i) => Math.min(a, i));
console.log(closest);
const t1 = performance.now();
console.log(`Runtime: ${t1 - t0}ms`);