548805_0_0_32701.cpp:23: error: `main' must return `int'
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&, _Compare) [with _Tp = std::pair<double, double>, _Compare = bool (*)(std::pair<double, double>&, std::pair<double, double>&)]':
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:2521: instantiated from `void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<mypair*, std::vector<mypair, std::allocator<mypair> > >, _Size = int, _Compare = bool (*)(std::pair<double, double>&, std::pair<double, double>&)]'
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:2591: instantiated from `void std::sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<mypair*, std::vector<mypair, std::allocator<mypair> > >, _Compare = bool (*)(std::pair<double, double>&, std::pair<double, double>&)]'
548805_0_0_32701.cpp:33: instantiated from here
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:124: error: invalid initialization of reference of type 'std::pair<double, double>&' from expression of type 'const std::pair<double, double>'
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:125: error: invalid initialization of reference of type 'std::pair<double, double>&' from expression of type 'const std::pair<double, double>'
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:127: error: invalid initialization of reference of type 'std::pair<double, double>&' from expression of type 'const std::pair<double, double>'
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:131: error: invalid initialization of reference of type 'std::pair<double, double>&' from expression of type 'const std::pair<double, double>'
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:133: error: invalid initialization of reference of type 'std::pair<double, double>&' from expression of type 'const std::pair<double, double>'
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