1 files changed, 12 insertions, 3 deletions
diff --git a/src/2015/day9/aoc.cpp b/src/2015/day9/aoc.cpp
index 8a5f8fd..95d65bb 100644
--- a/src/2015/day9/aoc.cpp
+++ b/src/2015/day9/aoc.cpp
@@ -1,14 +1,23 @@
 #include "aoc.h"
 
 namespace aoc2015 {
-int day9(line_view file) {
+std::pair<int, int> day9(line_view file) {
   world_day9 world;
   per_line(file, [&world](line_view lv) {
     world.parse(lv);
     return true;
   });
-  world.check();
-  return 0;
+  std::pair<int, int> d{INT32_MAX, INT32_MIN};
+  for (auto city : world.locations) {
+    auto p = world.plan(city);
+    if (p.first < d.first) {
+      d.first = p.first;
+    }
+    if (p.second > d.second) {
+      d.second = p.second;
+    }
+  }
+  return d;
 }
 
 } // namespace aoc2015