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View Compilation Error

0_0_30107736_2376.cpp: In function 'int main()':
0_0_30107736_2376.cpp:6:11: error: 'cin' was not declared in this scope
     while(cin >> n && n)
           ^
0_0_30107736_2376.cpp:6:11: note: suggested alternative:
In file included from 0_0_30107736_2376.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_30107736_2376.cpp:8:9: error: 'cout' was not declared in this scope
         cout << n*(n+1)/2%200907 << endl;
         ^
0_0_30107736_2376.cpp:8:9: note: suggested alternative:
In file included from 0_0_30107736_2376.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_30107736_2376.cpp:8:37: error: 'endl' was not declared in this scope
         cout << n*(n+1)/2%200907 << endl;
                                     ^
0_0_30107736_2376.cpp:8:37: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39:0,
                 from 0_0_30107736_2376.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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