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
+}