/in/foo.cc:5:7: error: expected nested-name-specifier before 'name'
 using name space std;
       ^~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:20:15: error: 'cout' was not declared in this scope
   if (cnt < k)cout << "NO"<<endl;
               ^~~~
/in/foo.cc:20:15: note: suggested alternative:
In file included from /in/foo.cc:1:0:
/usr/include/c++/6/iostream:61:18: note:   'std::cout'
   extern ostream cout;  /// Linked to standard output
                  ^~~~
/in/foo.cc:20:29: error: 'endl' was not declared in this scope
   if (cnt < k)cout << "NO"<<endl;
                             ^~~~
/in/foo.cc:20:29: note: suggested alternative:
In file included from /usr/include/c++/6/iostream:39:0,
                 from /in/foo.cc:1:
/usr/include/c++/6/ostream:590:5: note:   'std::endl'
     endl(basic_ostream<_CharT, _Traits>& __os)
     ^~~~
/in/foo.cc:24:17: error: 'cout' was not declared in this scope
    if (cnt % 2) cout << "NO"<<endl;
                 ^~~~
/in/foo.cc:24:17: note: suggested alternative:
In file included from /in/foo.cc:1:0:
/usr/include/c++/6/iostream:61:18: note:   'std::cout'
   extern ostream cout;  /// Linked to standard output
                  ^~~~
/in/foo.cc:24:31: error: 'endl' was not declared in this scope
    if (cnt % 2) cout << "NO"<<endl;
                               ^~~~
/in/foo.cc:24:31: note: suggested alternative:
In file included from /usr/include/c++/6/iostream:39:0,
                 from /in/foo.cc:1:
/usr/include/c++/6/ostream:590:5: note:   'std::endl'
     endl(basic_ostream<_CharT, _Traits>& __os)
     ^~~~
/in/foo.cc:27:5: error: 'cout' was not declared in this scope
     cout << "YES"<<endl;
     ^~~~
/in/foo.cc:27:5: note: suggested alternative:
In file included from /in/foo.cc:1:0:
/usr/include/c++/6/iostream:61:18: note:   'std::cout'
   extern ostream cout;  /// Linked to standard output
                  ^~~~
/in/foo.cc:27:20: error: 'endl' was not declared in this scope
     cout << "YES"<<endl;
                    ^~~~
/in/foo.cc:27:20: note: suggested alternative:
In file included from /usr/include/c++/6/iostream:39:0,
                 from /in/foo.cc:1:
/usr/include/c++/6/ostream:590:5: note:   'std::endl'
     endl(basic_ostream<_CharT, _Traits>& __os)
     ^~~~