1 files changed, 57 insertions, 0 deletions
diff --git a/Day17.cs b/Day17.cs
new file mode 100644
index 0000000..f9da08a
--- /dev/null
+++ b/Day17.cs
@@ -0,0 +1,57 @@
+using System;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using aoc2019.lib;
+
+namespace aoc2019
+{
+    internal sealed class Day17 : Day
+    {
+        private const bool Verbose = false;
+
+        private readonly IntCodeVM vm;
+
+        public Day17()
+        {
+            vm = new IntCodeVM(Input.First());
+        }
+
+        public override int DayNumber => 17;
+
+        protected override string Part1()
+        {
+            vm.Reset();
+            vm.Run();
+            var sb = new StringBuilder();
+            while (vm.output.Any())
+                sb.Append((char) vm.Result);
+            if (Verbose) Console.Write(sb);
+            var grid = sb.ToString().Trim().Split().Select(s => s.ToCharArray()).ToArray();
+
+            var sum = 0;
+            for (var y = 1; y < grid.Length - 1; y++)
+            for (var x = 1; x < grid[y].Length - 1; x++)
+                if (grid[y][x] == '#' &&
+                    grid[y - 1][x] == '#' &&
+                    grid[y + 1][x] == '#' &&
+                    grid[y][x - 1] == '#' &&
+                    grid[y][x + 1] == '#')
+                    sum += x * y;
+
+            return $"{sum}";
+        }
+
+        protected override string Part2()
+        {
+            vm.Reset();
+            vm.memory[0] = 2;
+            var halt = IntCodeVM.HaltType.Waiting;
+            while (halt == IntCodeVM.HaltType.Waiting)
+            {
+                halt = vm.Run();
+            }
+            return "";
+        }
+    }
+}
\ No newline at end of file