add day 13 outline

day13.go

@@ -0,0 +1,13 @@
+package main
+
+import "io"
+
+type day13 struct{}
+
+func (d day13) solve1(r io.Reader) string {
+	return "incomplete"
+}
+
+func (d day13) solve2(r io.Reader) string {
+	return "incomplete"
+}

main.go

@@ -32,6 +32,7 @@ var (
 		&day10{},
 		&day11{},
 		&day12{},
+		&day13{},
 	}
 )
 

main_test.go

@@ -201,5 +201,24 @@ ZZZ = (ZZZ, ZZZ)`,
     		       ?###???????? 3,2,1`,
 			ans1: "21",
 		},
+		{
+			// day 13
+			inp1: `#.##..##.
+    		       ..#.##.#.
+    		       ##......#
+    		       ##......#
+    		       ..#.##.#.
+    		       ..##..##.
+    		       #.#.##.#.
+
+    		       #...##..#
+    		       #....#..#
+    		       ..##..###
+    		       #####.##.
+    		       #####.##.
+    		       ..##..###
+    		       #....#..# `,
+			ans1: "405",
+		},
 	}
 )