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View Compilation Error

0_0_35715148_18024.cpp: In function 'int main()':
0_0_35715148_18024.cpp:3:2: error: 'set' was not declared in this scope
  set<string>A, B;
  ^
0_0_35715148_18024.cpp:3:2: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/set:61:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:86,
                 from 0_0_35715148_18024.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_set.h:90:11: note:   'std::set'
     class set
           ^
0_0_35715148_18024.cpp:3:6: error: 'string' was not declared in this scope
  set<string>A, B;
      ^
0_0_35715148_18024.cpp:3:6: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/iosfwd:39:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/istream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/sstream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/complex:45,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ccomplex:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:52,
                 from 0_0_35715148_18024.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stringfwd.h:62:33: note:   'std::string'
   typedef basic_string<char>    string;   
                                 ^
0_0_35715148_18024.cpp:3:13: error: 'A' was not declared in this scope
  set<string>A, B;
             ^
0_0_35715148_18024.cpp:3:16: error: 'B' was not declared in this scope
  set<string>A, B;
                ^
0_0_35715148_18024.cpp:4:9: error: expected ';' before 's1'
  string s1, s2;
         ^
0_0_35715148_18024.cpp:6:9: error: 'cin' was not declared in this scope
  while (cin >> n && n) {
         ^
0_0_35715148_18024.cpp:6:9: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:74:0,
                 from 0_0_35715148_18024.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:60:18: note:   'std::cin'
   extern istream cin;  /// Linked to standard input
                  ^
0_0_35715148_18024.cpp:8:11: error: 's1' was not declared in this scope
    cin >> s1 >> s2;
           ^
0_0_35715148_18024.cpp:8:17: error: 's2' was not declared in this scope
    cin >> s1 >> s2;
                 ^
0_0_35715148_18024.cpp:12:33: error: 'cout' was not declared in this scope
   if (A.size() - B.size() == 1) cout << "YES" << endl;
                                 ^
0_0_35715148_18024.cpp:12:33: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:74:0,
                 from 0_0_35715148_18024.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:61:18: note:   'std::cout'
   extern ostream cout;  /// Linked to standard output
                  ^
0_0_35715148_18024.cpp:12:50: error: 'endl' was not declared in this scope
   if (A.size() - B.size() == 1) cout << "YES" << endl;
                                                  ^
0_0_35715148_18024.cpp:12:50: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/istream:39:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/sstream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/complex:45,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ccomplex:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:52,
                 from 0_0_35715148_18024.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:564:5: note:   'std::endl'
     endl(basic_ostream<_CharT, _Traits>& __os)
     ^
0_0_35715148_18024.cpp:13:8: error: 'cout' was not declared in this scope
   else cout << "NO" << endl;
        ^
0_0_35715148_18024.cpp:13:8: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:74:0,
                 from 0_0_35715148_18024.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:61:18: note:   'std::cout'
   extern ostream cout;  /// Linked to standard output
                  ^
0_0_35715148_18024.cpp:13:24: error: 'endl' was not declared in this scope
   else cout << "NO" << endl;
                        ^
0_0_35715148_18024.cpp:13:24: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/istream:39:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/sstream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/complex:45,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ccomplex:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:52,
                 from 0_0_35715148_18024.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:564:5: note:   'std::endl'
     endl(basic_ostream<_CharT, _Traits>& __os)
     ^


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