diff --git a/fontes/ordset.h b/fontes/ordset.h
new file mode 100644
index 0000000000000000000000000000000000000000..b241513d283c75acf72d8b524d1ccf90b369ad93
--- /dev/null
+++ b/fontes/ordset.h
@@ -0,0 +1,6 @@
+#include <ext/pb_ds/assoc_container.hpp>
+using namespace __gnu_pbds;
+template <class T>
+using ordset = tree<
+  T, null_type, less<T>, rb_tree_tag,
+  tree_order_statistics_node_update>;