1 files changed, 13 insertions, 0 deletions
diff --git a/src/2015/day1/aoc.cpp b/src/2015/day1/aoc.cpp
index e69de29..2263558 100644
--- a/src/2015/day1/aoc.cpp
+++ b/src/2015/day1/aoc.cpp
@@ -0,0 +1,13 @@
+#include "aoc.h"
+
+namespace aoc2015 {
+
+int day1(line_view lv) {
+  int level = 0;
+  for (size_t i = 0; i < lv.length; ++i) {
+    level += lv.line[i] == '(' ? 1 : -1;
+  }
+  return level;
+}
+
+} // namespace aoc2015