foo.cc: In function 'int main()':
foo.cc:6:2: error: 'cout' was not declared in this scope
  cout<<"a: b:";
  ^~~~
foo.cc:6:2: note: suggested alternative:
In file included from foo.cc:1:0:
/usr/include/c++/6/iostream:61:18: note:   'std::cout'
   extern ostream cout;  /// Linked to standard output
                  ^~~~
foo.cc:7:2: error: 'cin' was not declared in this scope
  cin>>a;
  ^~~
foo.cc:7:2: note: suggested alternative:
In file included from foo.cc:1:0:
/usr/include/c++/6/iostream:60:18: note:   'std::cin'
   extern istream cin;  /// Linked to standard input
                  ^~~

自豪的采用jd5进行评测(github.com/masnn/jd5)