AoC-23/Day3/Part1.js

52 lines
1.2 KiB
JavaScript

import { readFileSync } from "fs";
const t0 = performance.now();
const lines = readFileSync("input.txt")
.toString()
.split("\n")
.filter((e) => e.length > 0)
.map((e) => e.split(""));
const numbers = lines.map((a) => {
const current = { index: 0, number: "" };
const scan = a
.map((c, i) => {
if (!isNaN(c)) {
current.number += c;
return -1;
} else if (current.number.length > 0) {
const next = {
number: current.number,
index: current.index,
};
current.index = i + 1;
current.number = "";
return next;
}
current.index = i + 1;
return -1;
})
.filter((e) => typeof e === "object" || e >= 0);
if (current.number.length > 0) scan.push(current);
return scan;
});
const adjacent = numbers
.map((a, l) =>
a.filter((n) => {
for (let k = 0; k < n.number.length; k++)
for (let i = -1; i < 2; i++)
for (let j = -1; j < 2; j++)
if (
lines[l + j] &&
(lines[l + j][n.index + k + i] ?? "").match(/[^.\s\w]/)
)
return true;
return false;
})
)
.filter((a) => a.length > 0);
const sum = [].concat(...adjacent).reduce((a, i) => a + parseInt(i.number), 0);
console.log(sum);
const t1 = performance.now();
console.log(`Runtime: ${t1 - t0}ms`);