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2024 day 11 final

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Andres
2024-12-11 15:50:27 +01:00
parent 2383e36ce8
commit b0dbc98766
4 changed files with 54 additions and 107 deletions
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40
2024/day-11/blink-worker.ts
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@@ -1,40 +0,0 @@
import { parentPort, workerData } from "node:worker_threads";
const cache = new Map<number, Array<number>>();
function transformSingleStone(stone: number): number[] {
if (cache.has(stone)) {
// biome-ignore lint/style/noNonNullAssertion: it's there, I promise
return cache.get(stone)!;
}
if (stone === 0) {
cache.set(stone, [1]);
return [1];
}
const numberAsString = stone.toString();
const numberOfDigits = numberAsString.length;
if (numberOfDigits % 2 === 0) {
const middle = numberOfDigits / 2;
const left = numberAsString.slice(0, middle);
const right = numberAsString.slice(middle);
const res = [Number.parseInt(left, 10), Number.parseInt(right, 10)];
cache.set(stone, res);
return res;
}
const res = [stone * 2024];
cache.set(stone, res);
return res;
}
function blink(stones: Array<number>) {
const newStones: number[] = [];
for (const stone of stones) {
newStones.push(...transformSingleStone(stone));
}
return newStones;
}
const result = blink(workerData);
parentPort?.postMessage(result);

17
2024/day-11/day11.test.ts
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@@ -10,9 +10,9 @@ test("day 11, part 1", async () => {
console.log("\n\n"); console.log("\n\n");
// const testResult = part1(testInput); const testResult = part1(testInput);
// console.log("Test data:", testResult); console.log("Test data:", testResult);
// expect(testResult).toEqual(55312); expect(testResult).toEqual(55312);
const finalResult = await part1(input); const finalResult = await part1(input);
console.log("Full data:", finalResult); console.log("Full data:", finalResult);
@@ -27,14 +27,9 @@ test("day 11, part 2", async () => {
).text(); ).text();
const input = await Bun.file(path.resolve(__dirname, "input.txt")).text(); const input = await Bun.file(path.resolve(__dirname, "input.txt")).text();
const testResult = part2(testInput); const finalResult = part2(input);
console.log("\n\n"); console.log("Full data:", finalResult);
console.log("Test data:", testResult); expect(finalResult).toEqual(218279375708592);
expect(testResult).toEqual(0);
// const finalResult = part2(input);
// console.log("Full data:", finalResult);
// expect(finalResult).toEqual(0);
console.log("\n\n"); console.log("\n\n");
}); });

74
2024/day-11/day11.ts
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@@ -1,35 +1,57 @@
import { Worker } from "node:worker_threads"; const cache = new Map<string, number>();
export async function part1(input: string) { export function part1(input: string) {
const lines = input.split("\n"); const lines = input.split("\n");
const line = lines[0]; const line = lines[0];
const stones = line.split(" ").map(Number); const stones = line.split(" ").map(Number);
stones.length = 1; let total = 0;
// for (let i = 0; i < 75; i++) { for (const stone of stones) {
// console.log(i); total += count(stone, 25);
// stones = blink(stones); }
// } return total;
let final = 0;
await Promise.all(
stones.map(async (stone) => {
const sum = (await new Promise((res) => {
const worker = new Worker("./2024/day-11/workers.ts", {
workerData: stone,
});
worker.on("message", (result) => {
res(result);
});
})) as number;
final += sum;
}),
);
return final;
} }
export function part2(input: string) { export function part2(input: string) {
const lines = input.split("\n"); const lines = input.split("\n");
const final = 0; const line = lines[0];
return final; const stones = line.split(" ").map(Number);
let total = 0;
for (const stone of stones) {
total += count(stone, 75);
}
return total;
}
function count(stone: number, steps: number): number {
const key = `${stone},${steps}`;
if (cache.has(key)) {
return cache.get(key) as number;
}
if (steps === 0) {
const res = 1;
cache.set(key, res);
return res;
}
if (stone === 0) {
const res = count(1, steps - 1);
cache.set(key, res);
return res;
}
const numberAsString = stone.toString();
const numberOfDigits = numberAsString.length;
if (numberOfDigits % 2 === 0) {
const middle = numberOfDigits / 2;
const left = numberAsString.slice(0, middle);
const right = numberAsString.slice(middle);
const res =
count(Number.parseInt(left, 10), steps - 1) +
count(Number.parseInt(right, 10), steps - 1);
cache.set(key, res);
return res;
}
const res = count(stone * 2024, steps - 1);
cache.set(key, res);
return res;
} }

30
2024/day-11/workers.ts
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@@ -1,30 +0,0 @@
import { Worker, parentPort, workerData } from "node:worker_threads";
import { chunk } from "remeda";
let stones = [workerData];
for (let i = 0; i < 75; i++) {
console.log(i);
const chunks = chunk(stones, 5_000_000);
const newStones = await Promise.all(
chunks.map((chunk) => processChunk(chunk)),
);
stones = newStones.flat(1);
}
parentPort?.postMessage(stones.length);
async function processChunk(chunk: number[]) {
console.log("processing chunk of length", chunk.length);
return await new Promise((res) => {
const worker = new Worker("./2024/day-11/blink-worker.ts", {
workerData: chunk,
});
worker.on("message", (result) => {
res(result);
});
});
}
// async function processChunk(chunk: number[]) {
// console.log("processing chunk of length", chunk.length);
// const result = await pool.exec("blink", [chunk]);
// }