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View Compilation Error

0_0_26517933_16559.cpp: In function 'int main()':
0_0_26517933_16559.cpp:4:1: error: 'string' was not declared in this scope
 string s;    int len, level;     
 ^
0_0_26517933_16559.cpp:4:1: 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++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_26517933_16559.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_26517933_16559.cpp:5:15: error: 'cin' was not declared in this scope
 while(getline(cin, s)) 
               ^
0_0_26517933_16559.cpp:5:15: note: suggested alternative:
In file included from 0_0_26517933_16559.cpp:1:0:
GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:60:18: note:   'std::cin'
   extern istream cin;  /// Linked to standard input
                  ^
0_0_26517933_16559.cpp:5:20: error: 's' was not declared in this scope
 while(getline(cin, s)) 
                    ^
0_0_26517933_16559.cpp:5:21: error: 'getline' was not declared in this scope
 while(getline(cin, s)) 
                     ^
0_0_26517933_16559.cpp:5:21: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_26517933_16559.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2827:5: note:   'std::getline'
     getline(basic_istream<_CharT, _Traits>&& __is,
     ^
0_0_26517933_16559.cpp:13:1: error: 'cout' was not declared in this scope
 cout << level << endl;    }     
 ^
0_0_26517933_16559.cpp:13:1: note: suggested alternative:
In file included from 0_0_26517933_16559.cpp:1:0:
GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:61:18: note:   'std::cout'
   extern ostream cout;  /// Linked to standard output
                  ^
0_0_26517933_16559.cpp:13:18: error: 'endl' was not declared in this scope
 cout << level << endl;    }     
                  ^
0_0_26517933_16559.cpp:13:18: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39:0,
                 from 0_0_26517933_16559.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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