From 8fcddb1917ffcfbeb9b091536352e609f8e709f3 Mon Sep 17 00:00:00 2001
From: Piotr Russ <mail@pruss.it>
Date: Thu, 17 Dec 2020 20:29:42 +0100
Subject: day17

---
 day17/day17-1.js | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 day17/day17-1.js

(limited to 'day17/day17-1.js')

diff --git a/day17/day17-1.js b/day17/day17-1.js
new file mode 100644
index 0000000..42e6b6f
--- /dev/null
+++ b/day17/day17-1.js
@@ -0,0 +1,54 @@
+const data = require('./data')
+const startArray = [data.split(/\n/g).filter(e => e).map(e => e.split(''))]
+const cycle = (arr) => {
+  const l = arr[0].length
+  const empty = Array(l+2).fill(Array(l+2).fill('.'))
+  const empty2 = Array(l+2).fill('.')
+  const addDots = ars => ars.map(ar => ([empty2, ...(ar.map(a => ['.', ...a, '.'])), empty2]))
+  const resized = [empty, ...addDots(arr), empty]
+  const around = (iz, iy, ix) => {
+    const f = (rz, ry, rx) => {
+      if (
+        !resized[iz+rz]
+        || !resized[iz+rz][iy+ry] 
+        || !resized[iz+rz][iy+ry][ix+rx]
+      ) { return 0 }
+      return resized[iz+rz][iy+ry][ix+rx] === '#' ? 1 : 0
+    }
+
+    let c = 0
+    for (let z=-1; z<=1; z++) {
+      for (let y=-1; y<=1; y++) {
+        for (let x=-1; x<=1; x++) {
+          if(!(x == 0 && y == 0 && z == 0)) { c += f(z, y, x) }
+        }
+      }
+    }
+    return c
+  }
+
+  return resized.map((z, iz) => z.map((y,iy) => y.map((x,ix) => {
+    const active = x === '#'
+    const activeAround = around(iz,iy,ix)
+
+    if (active) {
+      return (activeAround === 2 || activeAround === 3) ? '#' : '.'
+    } else {
+      return (activeAround === 3) ? '#' : '.'
+    }
+  })))
+}
+
+let cycleResult = startArray, round = 1
+while (round <= 6) {
+ cycleResult = cycle(cycleResult)
+ round++
+}
+
+let result = 0
+cycleResult.forEach(z => z.forEach(y => y.forEach(x => {
+  if (x === '#') {result++}
+})))
+
+console.log('Answer: ', result)
+
-- 
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