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View Compilation Error

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 = node]':
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 = node*, _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 = node*]'
0_0_10101331_631.cpp:53:   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'
0_0_10101331_631.cpp:32: note: candidates are: bool operator<(node&, node&)
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'
0_0_10101331_631.cpp:32: note: candidates are: bool operator<(node&, node&)
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'
0_0_10101331_631.cpp:32: note: candidates are: bool operator<(node&, node&)
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'
0_0_10101331_631.cpp:32: note: candidates are: bool operator<(node&, node&)
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'
0_0_10101331_631.cpp:32: note: candidates are: bool operator<(node&, node&)


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