Merge pull request #133 from amclin/feat/2020-day-11

build(2020-day-11): stub out day 11

Author: developher-net

2020/day-11/index.js

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+// eslint-disable-next-line no-unused-vars
+const console = require('../helpers')
+require('./solution')

2020/day-11/input.txt

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2020/day-11/seating.js

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+
+const parse = (data) => {
+ return data.split('\n').map((row) => {
+ return row.split('')
+ })
+}
+
+const format = (seatMap) => {
+ return seatMap.map((row) => row.join('')).join('\n')
+}
+
+const occupiedLineOfSite = ({ x, y, seatMap }) => {
+ let occupied = 0
+ const look = ({ lookX, lookY, dirX, dirY }) => {
+ if (lookY < 0 || lookY >= seatMap.length) {
+ // exceeded rows space
+ return 'x'
+ }
+ if (lookX < 0 || lookX >= seatMap[0].length) {
+ // exceeded column space
+ return 'x'
+ }
+ // Find the first seat in the direction, recursively
+ if (seatMap[lookY][lookX] !== '.') {
+ return seatMap[lookY][lookX]
+ }
+
+ // Recursively look in the next seat in this direction
+ return look({ lookX: lookX + dirX, lookY: lookY + dirY, dirX, dirY })
+ }
+
+ // 8 compass point directions
+ for (let dirX = -1; dirX <= 1; dirX++) {
+ for (let dirY = -1; dirY <= 1; dirY++) {
+ if (look({ lookX: x + dirX, lookY: y + dirY, dirX, dirY }) === '#') {
+ occupied++
+ }
+ }
+ }
+
+ return occupied
+}
+
+const occupiedNearby = ({ x, y, seatMap }) => {
+ let temp = ''
+
+ for (let row = y - 1; row <= y + 1; row++) {
+ for (let col = x - 1; col <= x + 1; col++) {
+ try {
+ temp += seatMap[row][col] || '-'
+ } catch {
+ temp += '-'
+ }
+ }
+ temp += '\n'
+ }
+ const occupied = (temp.match(/#/g) || []).length
+
+ // console.debug(temp)
+ // console.debug(`------${occupied}------------`)
+ return occupied
+}
+
+const advance = (seatMap, rules) => {
+ return seatMap.map((row, y) => {
+ return row.map((col, x) => {
+ return update({ x, y, seatMap, rules })
+ })
+ })
+}
+
+const update = ({ x, y, seatMap, rules = 'proximity' }) => {
+ let leaveThreshold = 4
+ let processor = occupiedNearby
+ if (rules === 'visibility') {
+ leaveThreshold = 5
+ processor = occupiedLineOfSite
+ }
+
+ let next = seatMap[y][x]
+ switch (seatMap[y][x]) {
+ case '.':
+ // Floor (.) never changes; seats don't move, and nobody sits on the floor.
+ next = seatMap[y][x]
+ break
+ case 'L':
+ // If a seat is empty (L) and there are no occupied seats adjacent to it, the seat becomes occupied.
+ if (processor({ x, y, seatMap }) === 0) {
+ next = '#'
+ }
+ break
+ case '#':
+ // If a seat is occupied (#) and four or more seats adjacent to it are also occupied, the seat becomes empty.
+ // We subtract 1 so we don't count the target seat
+ if (processor({ x, y, seatMap }) - 1 >= leaveThreshold) {
+ next = 'L'
+ }
+ break
+ default:
+ // Otherwise, the seat's state does not change.
+ next = seatMap[y][x]
+ }
+
+ return next
+}
+
+module.exports = {
+ format,
+ parse,
+ advance,
+ occupiedLineOfSite
+}