0_0_2133565_18340.cpp:17: error: ISO C++ forbids declaration of `operator<' with no type
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 = ROOM]':
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<ROOM*, std::vector<ROOM, std::allocator<ROOM> > >, _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<ROOM*, std::vector<ROOM, std::allocator<ROOM> > >]'
0_0_2133565_18340.cpp:38: instantiated from here
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:90: error: passing `const ROOM' as `this' argument of `int ROOM::operator<(const ROOM&)' discards qualifiers
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:91: error: passing `const ROOM' as `this' argument of `int ROOM::operator<(const ROOM&)' discards qualifiers
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:93: error: passing `const ROOM' as `this' argument of `int ROOM::operator<(const ROOM&)' discards qualifiers
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:97: error: passing `const ROOM' as `this' argument of `int ROOM::operator<(const ROOM&)' discards qualifiers
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:99: error: passing `const ROOM' as `this' argument of `int ROOM::operator<(const ROOM&)' discards qualifiers
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