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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| const keypad = { | ||
| 7: { x: 0, y: 0 }, | ||
| 8: { x: 1, y: 0 }, | ||
| 9: { x: 2, y: 0 }, | ||
| 4: { x: 0, y: 1 }, | ||
| 5: { x: 1, y: 1 }, | ||
| 6: { x: 2, y: 1 }, | ||
| 1: { x: 0, y: 2 }, | ||
| 2: { x: 1, y: 2 }, | ||
| 3: { x: 2, y: 2 }, | ||
| X: { x: 0, y: 3 }, | ||
| 0: { x: 1, y: 3 }, | ||
| A: { x: 2, y: 3 }, | ||
| }; | ||
|
|
||
| const arrowpad = { | ||
| "X": { x: 0, y: 0 }, | ||
| "^": { x: 1, y: 0 }, | ||
| "A": { x: 2, y: 0 }, | ||
| "<": { x: 0, y: 1 }, | ||
| "v": { x: 1, y: 1 }, | ||
| ">": { x: 2, y: 1 }, | ||
| }; | ||
|
|
||
| let memory = {}; | ||
| function type(code, pads) { | ||
| if (pads.length === 0) return code.length; | ||
| if (memory[`${code},${pads.length}`]) return memory[`${code},${pads.length}`]; | ||
| let pad = pads[0]; | ||
| let from = pad["A"]; | ||
| let pushes = 0; | ||
| for (let button of code) { | ||
| const to = pad[button]; | ||
| const queue = [{ ...from, push: "" }]; | ||
| let min = Infinity; | ||
| while (queue.length) { | ||
| const { x, y, push } = queue.shift(); | ||
| if (x === pad["X"].x && y === pad["X"].y) continue; | ||
| if (x === to.x && y === to.y) { | ||
| min = Math.min(min, type(`${push}A`, pads.slice(1))); | ||
| } | ||
| if (to.x > x) queue.push({ x: x + 1, y, push: `${push}>` }); | ||
| if (to.x < x) queue.push({ x: x - 1, y, push: `${push}<` }); | ||
| if (to.y > y) queue.push({ x, y: y + 1, push: `${push}v` }); | ||
| if (to.y < y) queue.push({ x, y: y - 1, push: `${push}^` }); | ||
| } | ||
| pushes += min; | ||
| from = to; | ||
| } | ||
| memory[`${code},${pads.length}`] = pushes; | ||
| return pushes; | ||
| } | ||
|
|
||
| export function part1(input) { | ||
| const codes = input.split("\n"); | ||
| return codes | ||
| .map(code => { | ||
| let pushes = type(code, [keypad, arrowpad, arrowpad]); | ||
| return parseInt(code) * pushes; | ||
| }) | ||
| .reduce((a, b) => a + b, 0); | ||
| } | ||
|
|
||
| export function part2(input) { | ||
| const codes = input.split("\n"); | ||
| return codes | ||
| .map(code => { | ||
| let pushes = type(code, [keypad, ...new Array(25).fill(arrowpad)]); | ||
| return parseInt(code) * pushes; | ||
| }) | ||
| .reduce((a, b) => a + b, 0); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,24 @@ | ||
| import { part1, part2 } from "./day21.js"; | ||
| import readInput from "../utils/read-input.js"; | ||
|
|
||
| const input = readInput(import.meta.url); | ||
|
|
||
| describe("day21 2024", () => { | ||
| describe("part1", () => { | ||
| test("it should work for part 1 examples", () => { | ||
| expect( | ||
| part1(["029A", "980A", "179A", "456A", "379A"].join("\n")), | ||
| ).toEqual(126384); | ||
| }); | ||
|
|
||
| test("it should work for part 1 input", () => { | ||
| expect(part1(input)).toEqual(136780); | ||
| }); | ||
| }); | ||
|
|
||
| describe("part2", () => { | ||
| test("it should work for part 2 input", () => { | ||
| expect(part2(input)).toEqual(167538833832712); | ||
| }); | ||
| }); | ||
| }); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,6 @@ | ||
| 129A | ||
| 176A | ||
| 985A | ||
| 170A | ||
| 528A | ||
|
|
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