Eroare de compilare: user.cpp: In function 'int main()': user.cpp:45: warning: array subscript has type 'char' user.cpp:46: warning: array subscript has type 'char' /usr/include/c++/4.2/bits/stl_algo.h: In function 'const _Tp& std::__median(const _Tp&, const _Tp&, const _Tp&, _Compare) [with _Tp = traseu, _Compare = int (*)(traseu&, traseu&)]': /usr/include/c++/4.2/bits/stl_algo.h:2795: instantiated from 'void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size, _Compare) [with _RandomAccessIterator = traseu*, _Size = int, _Compare = int (*)(traseu&, traseu&)]' /usr/include/c++/4.2/bits/stl_algo.h:2866: instantiated from 'void std::sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = traseu*, _Compare = int (*)(traseu&, traseu&)]' user.cpp:50: instantiated from here /usr/include/c++/4.2/bits/stl_algo.h:125: error: invalid initialization of reference of type 'traseu&' from expression of type 'const traseu' /usr/include/c++/4.2/bits/stl_algo.h:126: error: invalid initialization of reference of type 'traseu&' from expression of type 'const traseu' /usr/include/c++/4.2/bits/stl_algo.h:128: error: invalid initialization of reference of type 'traseu&' from expression of type 'const traseu' /usr/include/c++/4.2/bits/stl_algo.h:132: error: invalid initialization of reference of type 'traseu&' from expression of type 'const traseu' /usr/include/c++/4.2/bits/stl_algo.h:134: error: invalid initialization of reference of type 'traseu&' from expression of type 'const traseu'