View Compilation Error

0_0_30729893_23382.cpp: In function 'int main()':
0_0_30729893_23382.cpp:51:34: error: wrong number of template arguments (0, should be 1)
         sort(l+1, l+n+1, greater<>());
                                  ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_tree.h:63:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/set:60,
                 from 0_0_30729893_23382.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_function.h:358:12: error: provided for 'template<class _Tp> struct std::greater'
     struct greater : public binary_function<_Tp, _Tp, bool>
            ^