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|
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import * as R from "remeda"; |
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import { readFile } from "../05/part1.js"; |
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import Victor from "@a-robu/victor"; |
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|
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const V = (...args) => new Victor(...args); |
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|
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const readInput = (...args) => |
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readFile(...args) |
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.split("\n") |
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.filter((x) => x) |
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.map((l) => l.split("").map((x) => parseInt(x))); |
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|
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export const outOfBound = (size) => (pos) => { |
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if (Math.min(pos.x, pos.y) < 0) return true; |
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if (Math.max(pos.x, pos.y) >= size) return true; |
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return false; |
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}; |
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|
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export function generateVisibilityGrid(forest) { |
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const size = forest.length; |
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const visibility = Array(size) |
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.fill(null) |
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.map(() => Array(size).fill(false)); |
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|
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// top
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const positions = R.range(size)(0).map((x) => ({ |
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height: -1, |
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position: V(x, -1), |
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inc: V(0, 1), |
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})); |
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|
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// bottom
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positions.push( |
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...R.range(size)(0).map((x) => ({ |
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height: -1, |
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position: V(x, size), |
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inc: V(0, -1), |
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})) |
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); |
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|
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positions.push( |
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...R.range(size)(0).map((x) => ({ |
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height: -1, |
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position: V(-1, x), |
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inc: V(1, 0), |
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})) |
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); |
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positions.push( |
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...R.range(size)(0).map((x) => ({ |
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height: -1, |
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position: V(size, x), |
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inc: V(-1, 0), |
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})) |
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); |
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|
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while (positions.length) { |
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const pos = positions.shift(); |
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pos.position.add(pos.inc); |
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if (outOfBound(size)(pos.position)) continue; |
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if (forest[pos.position.x][pos.position.y] > pos.height) { |
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visibility[pos.position.x][pos.position.y] = true; |
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pos.height = forest[pos.position.x][pos.position.y]; |
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} |
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positions.push(pos); |
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} |
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return visibility; |
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} |
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export const puzzleInput = readInput(import.meta.url, "input"); |
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export const sample = readInput(import.meta.url, "sample"); |
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export const passthru = (func) => (arg) => { |
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func(arg); |
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return arg; |
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}; |
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|
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export const printMap = passthru((forest) => |
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forest.forEach((line) => console.log(line.join(" "))) |
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); |
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|
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export default R.createPipe( |
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generateVisibilityGrid, |
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R.flatten, |
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R.countBy(R.identity) |
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); |
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import * as R from "remeda"; |
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import Victor from "@a-robu/victor"; |
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|
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import { outOfBound } from "./part1"; |
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|
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const V = (...args) => new Victor(...args); |
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|
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function visibility(forest, x, y, dx, dy) { |
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const pos = V(x, y); |
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const inc = V(dx, dy); |
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let vis = 0; |
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while (true) { |
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pos.add(inc); |
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if (outOfBound(forest.length)(pos)) return vis; |
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|
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if (forest[x][y] <= forest[pos.x][pos.y]) return 1 + vis; |
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vis++; |
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} |
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} |
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|
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const visibilityAround = (forest) => (x, y) => |
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[ |
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[0, 1], |
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[0, -1], |
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[1, 0], |
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[-1, 0], |
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] |
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.map((d) => visibility(forest, x, y, ...d)) |
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.reduce((a, b) => a * b); |
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|
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export default R.createPipe( |
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(forest) => { |
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const va = visibilityAround(forest); |
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return forest.map((l, x) => l.map((_, y) => va(x, y))); |
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}, |
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R.flatten, |
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R.maxBy(R.identity) |
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); |
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|
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## \--- Day 8: Treetop Tree House --- |
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|
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The expedition comes across a peculiar patch of tall trees all planted carefully in a grid. The Elves explain that a previous expedition planted these trees as a reforestation effort. Now, they're curious if this would be a good location for a [tree house](https://en.wikipedia.org/wiki/Tree_house). |
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|
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First, determine whether there is enough tree cover here to keep a tree house _hidden_. To do this, you need to count the number of trees that are _visible from outside the grid_ when looking directly along a row or column. |
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|
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The Elves have already launched a [quadcopter](https://en.wikipedia.org/wiki/Quadcopter) to generate a map with the height of each tree (your puzzle input). For example: |
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|
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``` |
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30373 |
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25512 |
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65332 |
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33549 |
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35390 |
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|
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``` |
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|
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Each tree is represented as a single digit whose value is its height, where `0` is the shortest and `9` is the tallest. |
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|
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A tree is _visible_ if all of the other trees between it and an edge of the grid are _shorter_ than it. Only consider trees in the same row or column; that is, only look up, down, left, or right from any given tree. |
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|
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All of the trees around the edge of the grid are _visible_ - since they are already on the edge, there are no trees to block the view. In this example, that only leaves the _interior nine trees_ to consider: |
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|
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- The top-left `5` is _visible_ from the left and top. (It isn't visible from the right or bottom since other trees of height `5` are in the way.) |
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- The top-middle `5` is _visible_ from the top and right. |
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- The top-right `1` is not visible from any direction; for it to be visible, there would need to only be trees of height _0_ between it and an edge. |
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- The left-middle `5` is _visible_, but only from the right. |
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- The center `3` is not visible from any direction; for it to be visible, there would need to be only trees of at most height `2` between it and an edge. |
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- The right-middle `3` is _visible_ from the right. |
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- In the bottom row, the middle `5` is _visible_, but the `3` and `4` are not. |
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|
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With 16 trees visible on the edge and another 5 visible in the interior, a total of `*21*` trees are visible in this arrangement. |
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|
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Consider your map; _how many trees are visible from outside the grid?_ |
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|
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To begin, [get your puzzle input](8/input). |
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|
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Answer: |
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|
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You can also [Shareon [Twitter](https://twitter.com/intent/tweet?text=%22Treetop+Tree+House%22+%2D+Day+8+%2D+Advent+of+Code+2022&url=https%3A%2F%2Fadventofcode%2Ecom%2F2022%2Fday%2F8&related=ericwastl&hashtags=AdventOfCode) [Mastodon](<javascript:void(0);>)] this puzzle. |
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|
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import { test, expect, describe } from "vitest"; |
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|
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import { expectSolution } from "../01/main.js"; |
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import part1, { sample, puzzleInput } from "./part1.js"; |
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import part2 from "./part2.js"; |
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|
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describe("part 1", () => { |
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test("sample", () => { |
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expect(part1(sample)).toBe(21); |
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}); |
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test("solution", () => { |
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expectSolution(part1(puzzleInput)).toEqual(1703); |
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}); |
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}); |
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|
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describe("part 2", () => { |
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test("sample", () => { |
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expect(part2(sample)).toBe(8); |
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}); |
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test("solution", () => { |
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const solution = part2(puzzleInput); |
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expect(solution).toBeGreaterThan(160); |
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expectSolution(solution).toEqual(496650); |
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}); |
||||
}); |
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|
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--- |
||||
to: app/hello.js |
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--- |
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const hello = ``` |
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Hello! |
||||
This is your first hygen template. |
||||
|
||||
Learn what it can do here: |
||||
|
||||
https://github.com/jondot/hygen |
||||
``` |
||||
|
||||
console.log(hello) |
||||
|
||||
|
@ -0,0 +1,16 @@
@@ -0,0 +1,16 @@
|
||||
--- |
||||
to: 2022/<%= day %>/part1.js |
||||
--- |
||||
import * as R from "remeda"; |
||||
|
||||
import { readFile } from "../05/part1.js"; |
||||
|
||||
const readInput = (...args) => |
||||
readFile(...args) |
||||
.split("\n") |
||||
.filter((x) => x); |
||||
|
||||
export const puzzleInput = readInput(import.meta.url, "input"); |
||||
export const sample = readInput(import.meta.url, "sample"); |
||||
|
||||
export default = () => {}; |
@ -0,0 +1,7 @@
@@ -0,0 +1,7 @@
|
||||
--- |
||||
to: 2022/<%= day %>/part2.js |
||||
--- |
||||
import * as R from "remeda"; |
||||
|
||||
|
||||
export default = () => {}; |
@ -0,0 +1,7 @@
@@ -0,0 +1,7 @@
|
||||
module.exports = [ |
||||
{ |
||||
type: 'input', |
||||
name: 'day', |
||||
message: "advent day?" |
||||
} |
||||
] |
@ -1,17 +1,20 @@
@@ -1,17 +1,20 @@
|
||||
--- |
||||
to: 2022/<%= day %>/test.js |
||||
--- |
||||
import { test, expect, describe } from "vitest"; |
||||
|
||||
import { expectSolution } from "../01/main.js"; |
||||
import { solutionPart1, puzzleInput } from "./part1.js"; |
||||
import { solutionPart2 } from "./part2.js"; |
||||
import part1, { sample, puzzleInput } from "./part1.js"; |
||||
import part2 from "./part2.js"; |
||||
|
||||
describe("part 1", () => { |
||||
test.todo("solution", () => { |
||||
expectSolution(solutionPart1(puzzleInput)).toEqual("TODO"); |
||||
expectSolution(part1(puzzleInput)).toEqual("TODO"); |
||||
}); |
||||
}); |
||||
|
||||
describe("part 2", () => { |
||||
test.todo("solution", () => { |
||||
expectSolution(solutionPart2(puzzleInput)).toEqual("TODO"); |
||||
expectSolution(part2(puzzleInput)).toEqual("TODO"); |
||||
}); |
||||
}); |
@ -0,0 +1,5 @@
@@ -0,0 +1,5 @@
|
||||
--- |
||||
message: | |
||||
hygen {bold generator new} --name [NAME] --action [ACTION] |
||||
hygen {bold generator with-prompt} --name [NAME] --action [ACTION] |
||||
--- |
@ -0,0 +1,18 @@
@@ -0,0 +1,18 @@
|
||||
--- |
||||
to: _templates/<%= name %>/<%= action || 'new' %>/hello.ejs.t |
||||
--- |
||||
--- |
||||
to: app/hello.js |
||||
--- |
||||
const hello = ``` |
||||
Hello! |
||||
This is your first hygen template. |
||||
|
||||
Learn what it can do here: |
||||
|
||||
https://github.com/jondot/hygen |
||||
``` |
||||
|
||||
console.log(hello) |
||||
|
||||
|
@ -0,0 +1,18 @@
@@ -0,0 +1,18 @@
|
||||
--- |
||||
to: _templates/<%= name %>/<%= action || 'new' %>/hello.ejs.t |
||||
--- |
||||
--- |
||||
to: app/hello.js |
||||
--- |
||||
const hello = ``` |
||||
Hello! |
||||
This is your first prompt based hygen template. |
||||
|
||||
Learn what it can do here: |
||||
|
||||
https://github.com/jondot/hygen |
||||
``` |
||||
|
||||
console.log(hello) |
||||
|
||||
|
@ -0,0 +1,14 @@
@@ -0,0 +1,14 @@
|
||||
--- |
||||
to: _templates/<%= name %>/<%= action || 'new' %>/prompt.js |
||||
--- |
||||
|
||||
// see types of prompts: |
||||
// https://github.com/enquirer/enquirer/tree/master/examples |
||||
// |
||||
module.exports = [ |
||||
{ |
||||
type: 'input', |
||||
name: 'message', |
||||
message: "What's your message?" |
||||
} |
||||
] |
@ -0,0 +1,4 @@
@@ -0,0 +1,4 @@
|
||||
--- |
||||
setup: <%= name %> |
||||
force: true # this is because mostly, people init into existing folders is safe |
||||
--- |
Loading…
Reference in new issue