diff --git a/utils/unordered_map.cpp b/utils/unordered_map.cpp
new file mode 100644
index 0000000..1b8c816
--- /dev/null
+++ b/utils/unordered_map.cpp
@@ -0,0 +1,5 @@
+#include<iostream>
+
+template<class K, class T, class Hash, class KeyEqual, class Allocator>
+class unordered_map {
+}