运行 ID: 91247

Main.cc:3:7: error: expected nested-name-specifier before ‘namepace’
 using namepace std;
       ^~~~~~~~
Main.cc: In function ‘int main()’:
Main.cc:6:5: error: ‘string’ was not declared in this scope
     string s;
     ^~~~~~
Main.cc:6:5: note: suggested alternatives:
In file included from /usr/include/c++/7/iosfwd:39:0,
                 from /usr/include/c++/7/ios:38,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from Main.cc:1:
/usr/include/c++/7/bits/stringfwd.h:74:33: note:   ‘std::__cxx11::string’
   typedef basic_string    string;
                                 ^~~~~~
/usr/include/c++/7/bits/stringfwd.h:74:33: note:   ‘std::__cxx11::string’
Main.cc:7:5: error: ‘cin’ was not declared in this scope
     cin >> s;
     ^~~
Main.cc:7:5: note: suggested alternative:
In file included from Main.cc:1:0:
/usr/include/c++/7/iostream:60:18: note:   ‘std::cin’
   extern istream cin;  /// Linked to standard input
                  ^~~
Main.cc:7:12: error: ‘s’ was not declared in this scope
     cin >> s;
            ^
Main.cc:8:18: error: ‘cout’ was not declared in this scope
     if (s == "") cout << 1;
                  ^~~~
Main.cc:8:18: note: suggested alternative:
In file included from Main.cc:1:0:
/usr/include/c++/7/iostream:61:18: note:   ‘std::cout’
   extern ostream cout;  /// Linked to standard output
                  ^~~~
Main.cc:9:23: error: ‘cout’ was not declared in this scope
     else if (s == "") cout << 1;
                       ^~~~
Main.cc:9:23: note: suggested alternative:
In file included from Main.cc:1:0:
/usr/include/c++/7/iostream:61:18: note:   ‘std::cout’
   extern ostream cout;  /// Linked to standard output
                  ^~~~
Main.cc:10:23: error: ‘cout’ was not declared in this scope
     else if (s == "") cout << 1;
                       ^~~~
Main.cc:10:23: note: suggested alternative:
In file included from Main.cc:1:0:
/usr/include/c++/7/iostream:61:18: note:   ‘std::cout’
   extern ostream cout;  /// Linked to standard output
                  ^~~~
Main.cc:11:23: error: ‘cout’ was not declared in this scope
     else if (s == "") cout << 1;
                       ^~~~
Main.cc:11:23: note: suggested alternative:
In file included from Main.cc:1:0:
/usr/include/c++/7/iostream:61:18: note:   ‘std::cout’
   extern ostream cout;  /// Linked to standard output
                  ^~~~
Main.cc:12:23: error: ‘cout’ was not declared in this scope
     else if (s == "") cout << 1;
                       ^~~~
Main.cc:12:23: note: suggested alternative:
In file included from Main.cc:1:0:
/usr/include/c++/7/iostream:61:18: note:   ‘std::cout’
   extern ostream cout;  /// Linked to standard output
                  ^~~~