feat(2020-day-11): count chairs once seating stabilizes

Solves part 1

Author: developher-net

2020/day-11/input.txt

@@ -0,0 +1,91 @@
+LLLLLLLLLL.LLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLLLL.LLLLLLLL..LLLLLLLLL
+LLLLLLLLLL.LLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLL.LLLL.LLLLLLLLLLLLL.LLLLLLLLLLLLL.LLLLLLLLLLLLLLLL
+LLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLL.LLLL.LLLL.LLLLLLLL.LLLLLLLLLL.LLLLLLLL.LLLLLLLLLL
+LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLL.LLLL.LL.LLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLLLL
+LLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLL.LLLLL.LLLLLLLLLLLLLLLLLLL
+LLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLL.LLLLLLLLLL
+LLLLLLLL.LLLLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLL.LLLLLLLLLLLLL.LLLL.LLLLLLLLLLLLLL.LLLLLLLLLL
+...L.L......L...L..L...L..LL.....L.....L..LLLL..L.LL......LL....L..L.L..L....L.LL....LL..L..L
+LLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLLL.LLLLLL.LLLL.LLLL.LLLLLLLLLLLLL.LLLLL.LLLLLLLL.LLLLLLLLLL
+LLLLLLLLLL.LLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLL.LLLL.LLLLLLLL.LLLL.LLLLL.LLLLLLLLLLLLLLLLLLL
+LLLLLLLLLL.LLL..LLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLL.LLLL.LLLLLLLL.LLLLLLLLLL.LLLLLLLL.LLLLLLLLLL
+LLLLLLLLLL.LLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLL.LLLLLLLLLLLLL.LLLL.LLLLL.LLLLLLLLLLLLLLLLLLL
+LLLLLLLLLL.LLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLL.LLLL.LLLLLLLL.LLLL.LLLLL.LLLLLLLL.LLLLLLLLLL
+LLLLLLLLLL.LLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLL.LLLL.LLLLLLLLLLLLLLLLL.LLLLLLLLLL.LLLLLLLLLL
+LLLLLLLLLLLLLLL..LLLLLLLLLLLLLLLLL.LLLLLLLL.LLL.LLLLLLLLLLLLLLLLLLL.LLLLLLLLLLL.LLLLLLLLLLLLL
+LLLL.LLLLL.LLLL.LLL.LLLLLLLLLLLLLL.LLLLLLLL.LLLL.LLLL.LLLLLLLL.LLLL.LLLLLLLLLLLLLL.LLLLLLLLLL
+.....L.LLLL....LL..L...LLL.L.LL..LL.L........L....LL...L...L...L.LL....LL...L..L.....LL.L....
+LLLLLLLLLL.LLLL.LLLLLLLLL.LLLLLLLL.LL.LLLLLLLLLL.LLLL.LLLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLLLL
+LLLLLLLLLL.LLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLL.LLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLL.LL.LLLLLLL
+LLLLLLLLLL.LLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLL.LLLL..LLLLLLLLLLLL.LLLL.LLLLLLLLLLLLLL.LLLLLLLLLL
+LLLLLLLLLL.LLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLL.LLLL.LLLLLLLLLLLLL.LLLL.LLLLLLLLLLLLLL.LLLLLLLLLL
+LLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLL.LLLL.LLLLLLLLLLLLLLL.LLLLLLLLLLLL.LLLLLLLLLL
+LLLLLLLLLL.LLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLL.LLLL.LLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLL
+LLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLL.LLLL.LLLLLLLLLLLLL.LLLL.LLLLL.LLLLLLLLLLLLLLLLLLL
+LLLLLLLLLLLLLLL..LLLLLLLL.LLLLLLLL.LLLLLLLL.LLLL.LLLL.LLLLLLLL.LLLLLLLLLL.LLLLL.LL.LLLLLLLLLL
+...L......L....L....L......L.L.....L..L.L.L..L.L...LLL.....LLLL.L.......LL.LLL.L.LL....L.....
+LLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLL.LL.LLLLLLLLLLLLLLL.LLLLLLLL.LLLL.LLLLL.LLLLLLLL.L.LLLL.LLL
+LLLLLLLLLL.LLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLL.LL.L.LLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLLLL
+LLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLL.LLLLLLLLLLLLLL.LLLLLLLLLL
+LLLLLLLLLL.LLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLL.LLLL.LLLLLLLLLLLLL.LLLL.LLLLLLLLLLLLLLLLLLLLLLLLL
+...LL..........L..LLLLL...L.L..........L........L.LL..L..L.LLL.L..L.L.....LL...LL....L..L.L..
+LLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLLL.LLLL
+LLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLL..LLLLLL.LLLL.LLLLL.LLLLLLLL.LLLLLLLLLL
+LLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLL.LLLLLLLLL.LLLLLLLLLLLLL.LLLLL.LLLLLLLL.LLLLLLLLLL
+LLLL.LLLLL.LLLL.LLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLL.LLLLL.LLLLLLLL.LLLLLLLLLL
+LLLLLLLLLL.LLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLL.LLLLLLLLLLLLLLLLLL.LLLL.LLLLL.LLLLLLLL.LLLLLLLLLL
+LLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLL.LLLL.LLLLLLLLLLLLLLLLLL.LLLLL.LLLLLLLL.LLLLLLLLLL
+LLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLL.LLLL.LLLLLLLLLLLLLLLLLLL.LLL.LLLL.LLLLLLLLLL
+LLLLLLLLLL.LLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLL.LLLL.LLLL.LLLLLLLL.LLLL.LLLLL..LLLLLLL.LLLLLLLLLL
+LLLLLLLLL..L.LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLL.LLLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLLLL
+..LLLL.LL....LLL..L...L..L..L.......L..L...L.L...L..LL.L.L.L.L...L...L.L.L.L.L......LL...L..L
+LLLLLLLLLL.LLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLL.LLLL.LLLLLLLL.LLLL.LLLLL.LLLLL.LLLLLLLLLLLLL
+LLLLLLLLLL.LLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLLLL
+LLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLL.LLLL.LLLL.LLLLLLLLLLLLL.LLLLL.LLLLLLLL.LLLLLLLLLL
+LLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLL.LLLL.LLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL
+LLLLLLLLLLLLLLLLLLLLL.LLL.LLLLLLLL.L.LLLLLL.LLLL.LLLL.LLLLLLLL.LLLL.LLLLLL.LLLLLL..LLLLLL.LLL
+..L...L...L...L..L....L...LL.L.L.L..LL...........LLL.L......L..L.....LL..L..LLL........L....L
+LLLLLLLLLL.LLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLL.LLLLLLLLLLLLL.LLLLLLLLLL.LLLLLLLL.LLLLLLLLLL
+LLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLL.LLLLLLLLLLLLL.LLLLLLLLLL.LLLLLLLL.LLLLLLLLLL
+LLLLLLLLLL.LLLL.LLLLLLLLLLLLLLLLLL.LLLLLLLLLL.LLLLLLL.LLLLLLLL.LLLLLLLLLL.LLLLLLLLLLLLLLLLLLL
+LLLLLLLLLL.LLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLL.LLLLLLLLLLLLLL.LLLLLLLLLL
+LLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLL.LLLLLLL.LLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLL
+LLLLLLL.LL.LLLL.LLLLLLL.L.LLLLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLL.LLLL.LLLLLLLLLLLLLL.LLLLLLLLLL
+LLLLLLLLLL.LLLL.LLLLLLLLL.LLLLLLLL.LLLLLL.L.LLLL.LLLL.LLLLLLLLLLLLL.LLLLL.LLLLLLLL.LL.L.LLLLL
+..L.L.LL....L....L..L....L.L...L..L..L.L.....L..L...L.LL.....L...............L..............L
+LLLLLLLLLL.LLLLLLLLL.LLLLLLLLLLLLL.LLLLLLLL.LLLLLLLLL.LLLLLLLL.LLLL.LLLLL.LLLLLLLL.LLLLLLLLLL
+LLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLL.LL.L.LLLL.LLL.LLLL.LLLLL.LL.LLLLL.LLLLLLLLLL
+LLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLL.LLLL.LL.L.LLLLLLLL.LLLL.LLLLLLLLLLLLLL.LLLLLLLLLL
+LLLLLLLLLL.LLLLLLLLL.LLLLLLLLLLLLL.LLLLLLLL.LLLL.LLLL.LLLLLLLL.LLLL.LLLLL.LLLLLLLL.LLLLLLLLLL
+LLLLLLLLLL.LLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLL.LL.LLLLLLLLLL
+LLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLL.LLLLLLLLL.LLLLLLLL.LLLL.LLLLL.LLLLLLLL.LLLLLLLLLL
+LLLLLLLLLL.LLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLL.LLLLLLLLLLLLL.LLLL.LLLLLLLLLLLLLL.LLLLLLLLLL
+L.L.....L.L.L.LL.L......LLL.....L.L.L........L....LL.......L....L.....L....LL..L...LLL......L
+LLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLL.LLLL.LLLLLLLL.LLLL.LLLLL.LLLLLLLLLLLLLLLLLLL
+LLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLL.LLLLLL.L.LLLL.LLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLLLL
+LLLLLLLLLL.LLLLLLL.LLLLLL.LLLLLLLLLLLLLLLLLLLLLL.LLLL.LLLLLLLL.LLLL.LLLLLLLLLLLLLL.LLLLLLLLLL
+LLLLLLLLLL..LLL.LLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLL.LLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLLLL
+LLLLLLLLLL.LLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLL.LLLL.LLLL.LLLLLLLLLLLLL.LLLLL.LLLLLLLL.LLLLLLLLLL
+LLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLL.LLLLL.LLLLLLLL.LLLLLLLLLL
+LLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLL.LLLL.LLLL.LLLL.LLL.LLLL.LLLLLLLLLLLLLL.LLLLLLLLLL
+...L...L.....L....L.L..........L..L.L..L..L..LL.L..L.......L.......L....L....L...LLL..L..L..L
+LLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLL.LLLLL.LLLLLLLLLLLL.LLLLLLLLLLLLLL.LLLLLLLLLL
+LLLLLLLLLL.LLLL.LLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLL.LLLL.LLLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLLLL
+LLLLLLLLLL.LLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLL.LLLL.LLLL.LLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLL
+LLLLLLLL.LLLLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLL.LLLLLLLLL.LLLLLLLLLLLLL.LLLLL.LLLLLLLLLLLLLLLLLLL
+..LLL....L.LL....L..............LLL......LL.LLL.....LL..L.L..L........L......L...L.LL..LL..L.
+LLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLL.LLLL.LLLL.LLLLLLLL.LLLL.LLLLL.LLLLLLLL.LLLLLLLLLL
+LLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLL.LLLLLLLL.LLL..LLLLLLLLLLLLLL.LLLLLLLLLL
+L.LLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLL.LLLLLLLL.LLLL.LLLLL.LLLLLLLL.LLLLLLLLLL
+LLLLL.LLLLLLLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLL.LLLL.LLLLLLLLLLLLL.LLL...LLLLLLLLLLLLLLLLLLLLLLLL
+LLLLLLLLLLLLLLLLLLLLLLLLL..LLLLLLLLLLLLLLLLLLLLL.LLLL.LLLLLLLL.LLLL.LLLLL.LLLLLLLLLLLLLLLLLLL
+LLLLLLLLLL.LLLL.LLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLL.LLLLLLLLLLLLL.LLLL.LLLLLLLLLLLLLLLLLLLLLLLLL
+LLLLLLLLLL.LLLL.LLL.LLLLL.LLLLLLLL.LLLLLLLLLLLLL.LLLL.LLLLLLLL.LLLLLLLLLL.LLLLLLLLLLLLLLLLLLL
+LLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLL.LLLL.LLLL.LLLLLLLLLLLLL.LLLLL.LLLLLLLL.LLLLLLLLLL
+LLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLL.LLLL.LLLLLLLLLLLLL.LLLL.LLLLLLLLLLLLLL.LLLLLLLLLL
+L...L.LL......L...LLLLLL.L.L.L...L.L..L..L.LL....L......LL..L...LLL....L...LL......L.........
+LLLLLLLLLL.LLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLL.LLLL.LLLL.LLLLLLLLLLLLL.LLLLL.LLLLLLLL.LLLLLLLLLL
+LLLLLLLLLL.LLL..LLLLLLLLL.LLLLLLLL.LLLLLLLL.LLLLLLLLL.LLLLLLLLLLLLL.LLLLLL.LLLLLLLLLLLLLLLLLL
+LLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLL.LLLL.LLLLLLLLLLLLLLLLLL.LLLLLLL.LLLLLLLLLLLLLLLLL
+LLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLLLL.LLLLLLLLLLLLLL.LLLL
+LLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLL.LLLL.LLLLLLLLLLLLLL.LLLLLLLLLL

2020/day-11/solution.js

@@ -1,22 +1,29 @@
 const fs = require('fs')
 const path = require('path')
 const filePath = path.join(__dirname, 'input.txt')
-const { inputToArray } = require('../../2018/inputParser')
+const { parse, advance, format } = require('./seating')
 
 fs.readFile(filePath, { encoding: 'utf8' }, (err, initData) => {
   if (err) throw err
 
-  initData = inputToArray(initData.trim())
+  initData = 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()
-    console.debug(data)
-    return 'No answer yet'
+    let data = resetInput()
+    let last = 0
+    let curr = 1
+    while (curr !== last) {
+      last = curr
+      data = format(advance(parse(data)))
+      // count the current occupied seats
+      curr = (data.match(/#/g) || []).length
+    }
+    return curr
   }
 
   const part2 = () => {