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View Compilation Error

0_0_31817614_18456.cpp: In function 'int main()':
0_0_31817614_18456.cpp:6:5: error: 'cin' was not declared in this scope
     cin >> n;
     ^
0_0_31817614_18456.cpp:6:5: note: suggested alternative:
In file included from 0_0_31817614_18456.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_31817614_18456.cpp:12:22: error: 'sort' was not declared in this scope
         sort(a, a + m);
                      ^
0_0_31817614_18456.cpp:12:22: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from 0_0_31817614_18456.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:4705:5: note:   'std::sort'
     sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
     ^
0_0_31817614_18456.cpp:14:13: error: 'cout' was not declared in this scope
             cout << a[i] << " ";
             ^
0_0_31817614_18456.cpp:14:13: note: suggested alternative:
In file included from 0_0_31817614_18456.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_31817614_18456.cpp:16:9: error: 'cout' was not declared in this scope
         cout << a[m - 1] << endl;
         ^
0_0_31817614_18456.cpp:16:9: note: suggested alternative:
In file included from 0_0_31817614_18456.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_31817614_18456.cpp:16:29: error: 'endl' was not declared in this scope
         cout << a[m - 1] << endl;
                             ^
0_0_31817614_18456.cpp:16:29: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39:0,
                 from 0_0_31817614_18456.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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