运行 ID: 31532

Main.cc:2:1: error: ‘usingnamespace’ does not name a type
 usingnamespace std;
 ^~~~~~~~~~~~~~
Main.cc: In function ‘int main()’:
Main.cc:6:2: error: ‘cin’ was not declared in this scope
  cin>>h;
  ^~~
Main.cc:6:2: 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:9:2: error: ‘cout’ was not declared in this scope
  cout<& __os)
     ^~~~