set up the file structure

src/main.cpp

@@ -1,10 +1,33 @@
 /**
+ * @file main.cpp
+ *
  * @brief this is the main code of ICPC-Management-System
- * 
- * @details .
-*/
-#include<cstdio>
-int main()
-{
-	return 0;
-}
+ *
+ * @details In the function main(), the program will read the input data and
+ * call the APIs. Then the APIs will call the detailed functions to do the real
+ * work.
+ *
+ * @codesytle This file is written in a sytle mainly based on Google C++ Style
+ * Guide. What's sepecial is the comment:
+ * 1. Multi-line comments are always before the code they comment on.
+ * Usually the code they comment on is a complex procedure,like the definition
+ * of a function,a class or a variable with complex operation. If a multi-line
+ * comment is in one line, it will start with "/*" instead of "/**",otherwise it
+ * will start with "/**" and in the format of Doxygen.
+ * 2. Single-line comments are always after the code they comment on.
+ * Usually they are in the same line with the code they comment on,but sometimes
+ * they may come in the next lines. single-line comments shouldn't exceed 3
+ * lines as they are intended to be short and easy to understand.
+ * 3. Temporary disabled code will be marked with "//" in the front of each
+ * 4. Some comments have special meanings,like "//TODO", "//FIXME", "//XXX","//
+ * clang-format off" and "// clang-format on". They are not controlled by the
+ * previous rules.
+ *
+ * As I use Clang-format to format my code, so the code style may be a little
+ * bit strange sometimes, in the case I'll manually format the code.
+ */
+#include <algorithm>
+#include <cstdio>
+#include <string>
+using namespace std;
+int main() { return 0; }