2017 day13

1 files changed, 15 insertions, 1 deletions

diff --git a/src/2017/day13/aoc.cpp b/src/2017/day13/aoc.cpp
index bab6825..cb7bf1d 100644
--- a/src/2017/day13/aoc.cpp
+++ b/src/2017/day13/aoc.cpp
@@ -2,6 +2,15 @@
 
 namespace aoc2017 {
 
+bool delay_at(int t, const std::vector<scanner>& vs) { 
+  for (auto& s : vs) {
+    if (s.at_level(s.depth + t) == 0) {
+      return false;
+    }
+  }
+  return true;
+}
+
 std::pair<int64_t, int64_t> day13(line_view file) {
   std::vector<scanner> vs;
   per_line(file, [&vs](line_view lv) {
@@ -17,9 +26,14 @@ std::pair<int64_t, int64_t> day13(line_view file) {
     }
   }
 
+  int delay{0};
+  while (!delay_at(delay, vs)) {
+    delay++;
+  }
+
   // for (auto& s: vs) {
   //   s.print();
   // }
-  return {severity, 0};
+  return {severity, delay};
 }
 } // namespace aoc2017