1 files changed, 19 insertions, 0 deletions
diff --git a/src/2015/day3/aoc.h b/src/2015/day3/aoc.h
new file mode 100644
index 0000000..105cf9f
--- /dev/null
+++ b/src/2015/day3/aoc.h
@@ -0,0 +1,19 @@
+#pragma once
+
+#include "common.h"
+
+namespace aoc2015 {
+
+enum class dir { up, down, left, right };
+
+struct house {
+  int x;
+  int y;
+
+  bool operator<(const house& h) const noexcept { return x < h.x ? true : (x > h.x ? false : y < h.y); }
+};
+
+house move_day3(house, dir);
+std::pair<size_t, size_t> day3(line_view);
+
+} // namespace aoc2015