foo.cc: In function 'int main()':
foo.cc:6:2: error: 'cin' was not declared in this scope
  cin>>a>>" ">>b>>" ">>c>>" ">>d>>" ">>e>>" ">>f>>" ">>g>>" ">>h>>" ">>i>>" ">>j>>" ">>k>>" ">>l>>" ">>m;
  ^~~
foo.cc:6:2: note: suggested alternative:
In file included from foo.cc:2:0:
/usr/include/c++/7/iostream:60:18: note:   'std::cin'
   extern istream cin;  /// Linked to standard input
                  ^~~
foo.cc:8:3: error: 'cout' was not declared in this scope
   cout <<"Yes";
   ^~~~
foo.cc:8:3: note: suggested alternative:
In file included from foo.cc:2:0:
/usr/include/c++/7/iostream:61:18: note:   'std::cout'
   extern ostream cout;  /// Linked to standard output
                  ^~~~
foo.cc:10:3: error: 'cout' was not declared in this scope
   cout<<"No";
   ^~~~
foo.cc:10:3: note: suggested alternative:
In file included from foo.cc:2:0:
/usr/include/c++/7/iostream:61:18: note:   'std::cout'
   extern ostream cout;  /// Linked to standard output
                  ^~~~

[Hydro](https://hydro.ac)提供评测服务