From 2fdbbd79bed58399ab63f92ece74fe6abb450b9c Mon Sep 17 00:00:00 2001
From: Piotr Russ <piotr.russ@betvictor.com>
Date: Sat, 12 Dec 2020 10:38:29 +0100
Subject: day11

---
 day11/day11-1.js | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 day11/day11-1.js

(limited to 'day11/day11-1.js')

diff --git a/day11/day11-1.js b/day11/day11-1.js
new file mode 100644
index 0000000..7d495b6
--- /dev/null
+++ b/day11/day11-1.js
@@ -0,0 +1,43 @@
+const data = require('./data')
+const rows = data.split(/\n/g).filter(r => r)
+const rowLn = rows[0].length
+const string = rows.join('')
+
+const checkSeat = (i, s) => {
+  const around = [
+    i >= rowLn ? s[i-rowLn] : '.',                                  // top
+    i >= rowLn && (i+1)%rowLn !== 0 ? s[i+1-rowLn] : '.',           // top-right
+    (i+1)%rowLn !== 0 ? s[i+1] : '.',                               // right
+    i < s.length -rowLn && (i+1)%rowLn !== 0 ? s[i+1+rowLn] : '.',  // bottom-right
+    i < s.length -rowLn ? s[i+rowLn] : '.',                         // bottom
+    i%rowLn !== 0 && i < s.length -rowLn ? s[i-1+rowLn] : '.',      // bottom-left
+    i%rowLn !== 0 ? s[i-1] : '.',                                   // left
+    i > rowLn && i%rowLn > 0 ? s[i-1-rowLn] : '.',                  // top-left
+  ]
+
+  const taken = around.filter(s => s === '#').length
+  const free = around.filter(s => s === 'L').length
+
+  return [taken, free]
+}
+
+const round = (str) => {
+  const newArray = []
+  str.split('').forEach((s, i) => {
+    const [taken, free] = checkSeat(i, str)
+    if (s === 'L' && taken === 0) {
+      newArray[i] = '#'
+    } else if (s === '#' && taken >= 4) {
+      newArray[i] = 'L'
+    } else {
+      newArray[i] = str[i]
+    }
+  })
+
+  const newString = newArray.join('')
+  return newString === str
+    ? newString.split('').filter(s => s === '#').length
+    : round(newString)
+}
+
+console.log(round(string))
-- 
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