GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h: In function `const _Tp& std::__median(const _Tp&, const _Tp&, const _Tp&) [with _Tp = student]':
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:2484: instantiated from `void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<student*, std::vector<student, std::allocator<student> > >, _Size = int]'
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:2555: instantiated from `void std::sort(_RandomAccessIterator, _RandomAccessIterator) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<student*, std::vector<student, std::allocator<student> > >]'
345815_0_20620.cpp:63: instantiated from here
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:90: error: no match for 'operator<' in '__a < __b'
345815_0_20620.cpp:13: note: candidates are: bool student::operator<(student&)
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:91: error: no match for 'operator<' in '__b < __c'
345815_0_20620.cpp:13: note: candidates are: bool student::operator<(student&)
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:93: error: no match for 'operator<' in '__a < __c'
345815_0_20620.cpp:13: note: candidates are: bool student::operator<(student&)
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:97: error: no match for 'operator<' in '__a < __c'
345815_0_20620.cpp:13: note: candidates are: bool student::operator<(student&)
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:99: error: no match for 'operator<' in '__b < __c'
345815_0_20620.cpp:13: note: candidates are: bool student::operator<(student&)
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