From 6e98070f918d9ba6213097806c9b6c5ecf9f3b63 Mon Sep 17 00:00:00 2001 From: Anthony McLin Date: Sun, 6 Dec 2020 21:11:18 -0800 Subject: [PATCH 1/3] feat[2020-day-03]: check a route to the airport for trees --- 2020/day-03/airportRoute.js | 33 +++++++++++++++++++++++++++ 2020/day-03/airportRoute.test.js | 39 ++++++++++++++++++++++++++++++++ 2020/day-03/index.js | 1 + 3 files changed, 73 insertions(+) create mode 100644 2020/day-03/airportRoute.js create mode 100644 2020/day-03/airportRoute.test.js create mode 100644 2020/day-03/index.js diff --git a/2020/day-03/airportRoute.js b/2020/day-03/airportRoute.js new file mode 100644 index 0000000..7b4743c --- /dev/null +++ b/2020/day-03/airportRoute.js @@ -0,0 +1,33 @@ +const queryPosition = ({ map, position }) => { + // check vertical position + const row = map.rows[position[1]] + // check horizontal which repeats + return row[(position[0] % row.length)] +} + +const positionHasTree = ({ map, position }) => { + return (queryPosition({ map, position }) === '#') +} + +const countTreesOnRoute = ({ + map, + start = [0, 0], + slope = [3, 1] +}) => { + let treeCount = 0 + const position = start + const advance = () => { + position[0] += slope[0] + position[1] += slope[1] + } + while (position[1] < map.rows.length) { + if (positionHasTree({ map, position })) treeCount++ + advance() + } + return treeCount +} + +module.exports = { + countTreesOnRoute, + positionHasTree +} diff --git a/2020/day-03/airportRoute.test.js b/2020/day-03/airportRoute.test.js new file mode 100644 index 0000000..ba640a5 --- /dev/null +++ b/2020/day-03/airportRoute.test.js @@ -0,0 +1,39 @@ +/* eslint-env mocha */ +const { expect } = require('chai') +const { positionHasTree, countTreesOnRoute } = require('./airportRoute') +const testData = [ + '..##.......', + '#...#...#..', + '.#....#..#.', + '..#.#...#.#', + '.#...##..#.', + '..#.##.....', + '.#.#.#....#', + '.#........#', + '#.##...#...', + '#...##....#', + '.#..#...#.#' +] + +describe('--- Day 3: Toboggan Trajectory ---', () => { + describe('Part 1', () => { + describe('positionHasTree()', () => { + it('can find a tree', () => { + expect(positionHasTree({ map: { rows: testData }, position: [4, 5] })).to.equal(true) + expect(positionHasTree({ map: { rows: testData }, position: [8, 9] })).to.equal(false) + }) + it('can handle the horizontal terrain repeat', () => { + expect(positionHasTree({ map: { rows: testData }, position: [25, 5] })).to.equal(false) + }) + }) + describe('countTreesOnRoute()', () => { + it('tallies the number of trees on the route', () => { + expect( + countTreesOnRoute({ + map: { rows: testData } + }) + ).to.equal(7) + }) + }) + }) +}) diff --git a/2020/day-03/index.js b/2020/day-03/index.js new file mode 100644 index 0000000..a7e4223 --- /dev/null +++ b/2020/day-03/index.js @@ -0,0 +1 @@ +require('./solution') From de18ecd89489a1d42480f0c6efb61d463efb4740 Mon Sep 17 00:00:00 2001 From: Anthony McLin Date: Sun, 6 Dec 2020 21:16:02 -0800 Subject: [PATCH 2/3] feat[2020-day-03]: find number of tree collisions on provided route Solution for part 1 --- 2020/day-03/input.txt | 323 ++++++++++++++++++++++++++++++++++++++++ 2020/day-03/solution.js | 35 +++++ 2 files changed, 358 insertions(+) create mode 100644 2020/day-03/input.txt create mode 100644 2020/day-03/solution.js diff --git a/2020/day-03/input.txt b/2020/day-03/input.txt new file mode 100644 index 0000000..086d326 --- /dev/null +++ b/2020/day-03/input.txt @@ -0,0 +1,323 @@ +...........#..#.#.###....#..... +...#..#...........#.#...#...... +#.....#..#........#...#..##.... +..#...##.#.....#.............#. +#.#..#......#.....#....#....... +.....#......#..#....#.....#.... +.......#.#..............#...... +.....#...#..........##...#..... +...#....#.#...#.#........#...#. +..#.........###.......##...##.. +.#....#...........#........#..# +..#.............##............. +..#.##.#....#................#. +.....##.#.......#....#...#..... +......#.#....##................ 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+#..........#.....##.#.......... +#.......#.#...#...#....#....... +#...#.....##.......#.#..#.#.#.. +.........#.#.#..#..#...#.###... +.................##...#....#... +###.......#..........##...#.... +#.#..#.........#....##.#....... +......#.#.....#........#....... +.......#.#........#......#.#..# +..............#..#...##....#..# +#...........#...##.....#..#.#.. +..#....#..#.#.#...#..#....#.#.. +...##.#.....#..#...##..#.....#. +..#.#................#........# +......#...#.............#...... +.##............#....#...#..#... +....#...#...........#.......#.. +.###..#.......#.............#.# +.#.#....#.#...........#.#...... +...#.........#.........#..#.... +...#..........#.#.....#.#...... +.....#........#....##......#... +..#.#.#......#..#.#......#....# +.#.#..#................#.#..... +.#.#.........##...#.......#.#.# +#..#.....#...#..#...........#.. +..##......####......#..#....### +#.....###....#.#........#..#..# +..##.#...#.#..##..........#..#. +#.........#.#.............#...# +...#.#...#...#.#.#....##....... +##.##...#.....#...#...........# +....#........#.#.....#......... +.................##..#..##...## +.....##....#...#...#.....#..#.. +....#...#........#............# +..#...........##....#...#...##. +.....#......#.........#..##.#.. \ No newline at end of file diff --git a/2020/day-03/solution.js b/2020/day-03/solution.js new file mode 100644 index 0000000..6d13efb --- /dev/null +++ b/2020/day-03/solution.js @@ -0,0 +1,35 @@ +const fs = require('fs') +const path = require('path') +const filePath = path.join(__dirname, 'input.txt') +const { linesToArray } = require('../../2018/inputParser') +const { countTreesOnRoute } = require('./airportRoute') + +fs.readFile(filePath, { encoding: 'utf8' }, (err, initData) => { + if (err) throw err + + initData = linesToArray(initData.trim()) + + const resetInput = () => { + // Deep copy to ensure we aren't mutating the original data + return JSON.parse(JSON.stringify(initData)) + } + + const part1 = () => { + const data = resetInput() + return countTreesOnRoute({ map: { rows: data } }) + } + + const part2 = () => { + const data = resetInput() + console.debug(data) + return 'No answer yet' + } + const answers = [] + answers.push(part1()) + answers.push(part2()) + + answers.forEach((ans, idx) => { + console.info(`-- Part ${idx + 1} --`) + console.info(`Answer: ${ans}`) + }) +}) From dfbfec2c7489cf1a84d8a6addf47595b2898bf03 Mon Sep 17 00:00:00 2001 From: Anthony McLin Date: Sun, 6 Dec 2020 21:23:35 -0800 Subject: [PATCH 3/3] feat[2020-day-03]: calculate tree collisions for multiple slopes Solution for part 2 --- 2020/day-03/solution.js | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/2020/day-03/solution.js b/2020/day-03/solution.js index 6d13efb..f915c14 100644 --- a/2020/day-03/solution.js +++ b/2020/day-03/solution.js @@ -21,8 +21,20 @@ fs.readFile(filePath, { encoding: 'utf8' }, (err, initData) => { const part2 = () => { const data = resetInput() - console.debug(data) - return 'No answer yet' + const slopes = [ + [1, 1], + [3, 1], // Same as default + [5, 1], + [7, 1], + [1, 2] + ] + // Multiple the results of multiple slopes + return slopes.reduce((itr, slope) => { + return itr * countTreesOnRoute({ + map: { rows: data }, + slope + }) + }, 1) } const answers = [] answers.push(part1())