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Day 4

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Tyler Beckman 2024-12-03 21:42:57 -07:00
parent a2f09799e5
commit f1a2c33fce
Signed by: Ty
GPG key ID: 2813440C772555A4
2 changed files with 36 additions and 0 deletions
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19
day4/part1.ts Normal file
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export async function solve() {
const grid = await Deno.readTextFile("./input.txt").then(i => i.split("\n").map(l => l.split("")));
let sum = 0;
for (const [y, line] of grid.map((e, i) => [i, e] as const)) {
for (let x = 0; x < line.length; x++) {
// Check horizontal forwards & backwards
if (["XMAS", "SAMX"].includes(grid[y].slice(x, x + 4).join(""))) sum++;
// Check vertical forwards & backwards
if (["XMAS", "SAMX"].includes(grid.slice(y, y + 4).map(l => l[x]).join(""))) sum++;
// Check diagonal \ forwards & backwards
if (["XMAS", "SAMX"].includes(grid.slice(y, y + 4).map((l, i) => l[x + i]).join(""))) sum++;
// Check diagonal / forwards & backwards
if (["XMAS", "SAMX"].includes(grid.slice(y, y + 4).map((l, i) => l[x + (3 - i)]).join(""))) sum++;
}
}
return sum
}

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day4/part2.ts Normal file
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export async function solve() {
const grid = await Deno.readTextFile("./input.txt").then(i => i.split("\n").map(l => l.split("")));
let sum = 0;
for (const [y, line] of grid.map((e, i) => [i, e] as const)) {
for (let x = 0; x < line.length; x++) {
if (
// Check diagonal \ forwards & backwards
["MAS", "SAM"].includes(grid.slice(y, y + 3).map((l, i) => l[x + i]).join(""))
// Check diagonal / forwards & backwards
&& ["MAS", "SAM"].includes(grid.slice(y, y + 3).map((l, i) => l[x + 2 - i]).join(""))
) sum++;
}
}
return sum
}