1 files changed, 10 insertions, 1 deletions
diff --git a/src/2017/day22/aoc.h b/src/2017/day22/aoc.h
index 6c9c549..2011f47 100644
--- a/src/2017/day22/aoc.h
+++ b/src/2017/day22/aoc.h
@@ -3,5 +3,14 @@
 #include <vector>
 
 namespace aoc2017 {
+
+struct node22 {
+  int x;
+  int y;
+
+  node22(int x0, int y0): x(x0), y(y0) {}
+  bool operator<(const node22& n) const noexcept { return x < n.x ? true : x > n.x ? false : y < n.y; }
+};
+
 std::pair<int64_t, int64_t> day22(line_view);
-}
+} // namespace aoc2017