diff --git a/participants/gyk/helloworld.cc b/participants/gyk/helloworld.cc
new file mode 100644
index 0000000..0539929
--- /dev/null
+++ b/participants/gyk/helloworld.cc
@@ -0,0 +1,6 @@
+#include <cstdio>
+int main()
+{
+	printf("hello world!");
+	return 0;
+}
\ No newline at end of file