day1

1 files changed, 30 insertions, 1 deletions

diff --git a/src/2015/day1/aoc.cpp b/src/2015/day1/aoc.cpp
index 2263558..4a4d4fc 100644
--- a/src/2015/day1/aoc.cpp
+++ b/src/2015/day1/aoc.cpp
@@ -5,9 +5,38 @@ 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;
+    switch (lv.line[i]) {
+    case '(':
+      level += 1;
+      break;
+    case ')':
+      level += -1;
+      break;
+    default:
+      break;
+    }
   }
   return level;
 }
 
+int day1(line_view lv, int target) {
+  int level = 0;
+  for (size_t i = 0; i < lv.length; ++i) {
+    switch (lv.line[i]) {
+    case '(':
+      level += 1;
+      break;
+    case ')':
+      level += -1;
+      break;
+    default:
+      break;
+    }
+    if (level == target) {
+      return i + 1;
+    }
+  }
+  return -1;
+}
+
 } // namespace aoc2015