diff --git a/global.hpp b/global.hpp
index d420651..456923d 100644
--- a/global.hpp
+++ b/global.hpp
@@ -1,3 +1,4 @@
+#pragma once
 #include <iostream>
 #include <vector>
 #include <string>
diff --git a/solver.hpp b/solver.hpp
index 555d151..7fd4b12 100644
--- a/solver.hpp
+++ b/solver.hpp
@@ -1,3 +1,4 @@
+#pragma once
 #include "global.hpp"
 #include <algorithm>
 #include <chrono>