From cd816151aaa58e6ffa3a7dac6c1e915cceeafca6 Mon Sep 17 00:00:00 2001
From: Ben Harris <ben@tilde.team>
Date: Sun, 8 Dec 2019 01:56:33 -0500
Subject: day 8

---
 Day8.cs | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 Day8.cs

(limited to 'Day8.cs')

diff --git a/Day8.cs b/Day8.cs
new file mode 100644
index 0000000..aae6aa0
--- /dev/null
+++ b/Day8.cs
@@ -0,0 +1,39 @@
+using aoc2019.lib;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace aoc2019
+{
+    internal class Day8 : Day
+    {
+        public override int DayNumber => 8;
+
+        private readonly List<List<char>> photo;
+        public Day8()
+        {
+            photo = Input.First().Chunk(25 * 6).Select(s => s.ToList()).ToList();
+        }
+
+        public override string Part1()
+        {
+            var l = photo.OrderBy(layer => layer.Count(pixel => pixel == '0')).First();
+            return $"{l.Count(p => p == '1') * l.Count(p => p == '2')}";
+        }
+
+        public override string Part2()
+        {
+            return Enumerable.Range(0, 25 * 6)
+                .Select(p => Enumerable.Range(0, photo.Count)
+                    .Select(l => photo[l][p])
+                    .Aggregate('2', (acc, next) =>
+                        acc != '2' ? acc : next == '0' ? ' ' : next
+                    )
+                )
+                .ToDelimitedString()
+                .Chunk(25)
+                .ToDelimitedString(Environment.NewLine)
+                .Replace('1', 'x');
+        }
+    }
+}
-- 
cgit 1.4.1