diff --git a/cpp/stl_rb_tree.cpp b/cpp/stl_rb_tree.cpp
new file mode 100644
index 0000000..cd25ca6
--- /dev/null
+++ b/cpp/stl_rb_tree.cpp
@@ -0,0 +1,43 @@
+/*
+VIM: let b:cf5build="clang -std=c++20 -O2 -pthread -lstdc++ -I. {SRC} -o {OUT}"
+VIM: let b:cf5run="{OUT}"
+*/
+#include <iostream>
+#include <exception>
+#include <chrono>
+#include <set>
+
+int main ( void )
+{try{
+    auto begin = std::chrono::high_resolution_clock::now();
+
+    std::set<int> s({1, 2, 3, 4, 5});
+    //......
+    auto it = s.begin();
+    for (int i = 0; i < 10; i++){
+        std::cout << *it++ << ", " << std::endl;
+    }
+    std::cout << "-------" << std::endl;
+    it = s.end();
+    for (int i = 0; i < 10; i++){
+        std::cout << *it-- << ", " << std::endl;
+    }
+
+    auto end = std::chrono::high_resolution_clock::now();
+    std::chrono::duration<double> seconds = end - begin;
+    std::cout << "Time: " << seconds.count() << std::endl;
+    return 0;
+}
+catch ( const std::exception& e )
+{
+    std::cerr << std::endl
+            << "std::exception(\"" << e.what() << "\")." << std::endl;
+    return 2;
+}
+catch ( ... )
+{
+    std::cerr  << std::endl
+            << "unknown exception." << std::endl;
+    return 1;
+}}
+