Update app.py

app.py

@@ -11,7 +11,7 @@ from code_editor import code_editor
 
 lang_map = {
     "Python": ["python", "python", "# Don't Worry, You Can't Break It. We Promise.\nprint('Hello World')\n"],
-    "CPP": ["c_cpp", "cpp", "// Don't Worry, You Can't Break It. We Promise.\n// For Cpp, please make sure the program lasts at least 1 ms.\n#include <iostream>\nusing namespace std;\nint main() {\n\tcout << 'Hello World';\t\nreturn 0;\n}\n"],
+    "CPP": ["cpp", "cpp", "// Don't Worry, You Can't Break It. We Promise.\n// For Cpp, please make sure the program lasts at least 1 ms.\n#include <iostream>\nusing namespace std;\nint main() {\n\tcout << 'Hello World';\t\nreturn 0;\n}\n"],
     "Java": ["java", "java", "// Don't Worry, You Can't Break It. We Promise.\nclass HelloWorld\n{\n\tpublic static void main(String[] args)\n\t{\n\t\tSystem.out.println('Hello, World');\n\t}\n}\n"],
     "JavaScript": ["javascript", "javascript", "// Don't Worry, You Can't Break It. We Promise.\nconsole.log('Hello World!');\n"],
     "Golang": ["go", "go", "// Don't Worry, You Can't Break It. We Promise.\npackage main\nimport 'fmt'\nfunc main() {\n\tfmt.Println('hello world')\n}\n"],