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 = point]':
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<point*, std::vector<point, std::allocator<point> > >, _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<point*, std::vector<point, std::allocator<point> > >]'
0_0_3134437_21599.cpp:157: instantiated from here
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:90: error: passing `const point' as `this' argument of `bool point::operator<(const point&)' discards qualifiers
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:91: error: passing `const point' as `this' argument of `bool point::operator<(const point&)' discards qualifiers
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:93: error: passing `const point' as `this' argument of `bool point::operator<(const point&)' discards qualifiers
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:97: error: passing `const point' as `this' argument of `bool point::operator<(const point&)' discards qualifiers
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:99: error: passing `const point' as `this' argument of `bool point::operator<(const point&)' discards qualifiers
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