Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:106: warning: comparison between signed and unsigned integer expressions In file included from /usr/include/c++/4.4/algorithm:62, from user.cpp:2: /usr/include/c++/4.4/bits/stl_algo.h: In function ‘const _Tp& std::__median(const _Tp&, const _Tp&, const _Tp&, _Compare) [with _Tp = std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, int>, _Compare = bool (*)(Pair&, Pair&)]’: /usr/include/c++/4.4/bits/stl_algo.h:2301: instantiated from ‘void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size, _Compare) [with _RandomAccessIterator = Pair*, _Size = int, _Compare = bool (*)(Pair&, Pair&)]’ /usr/include/c++/4.4/bits/stl_algo.h:5258: instantiated from ‘void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = Pair*, _Compare = bool (*)(Pair&, Pair&)]’ user.cpp:88: instantiated from here /usr/include/c++/4.4/bits/stl_algo.h:124: error: invalid initialization of reference of type ‘Pair&’ from expression of type ‘const std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, int>’ /usr/include/c++/4.4/bits/stl_algo.h:125: error: invalid initialization of reference of type ‘Pair&’ from expression of type ‘const std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, int>’ /usr/include/c++/4.4/bits/stl_algo.h:127: error: invalid initialization of reference of type ‘Pair&’ from expression of type ‘const std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, int>’ /usr/include/c++/4.4/bits/stl_algo.h:131: error: invalid initialization of reference of type ‘Pair&’ from expression of type ‘const std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, int>’ /usr/include/c++/4.4/bits/stl_algo.h:133: error: invalid initialization of reference of type ‘Pair&’ from expression of type ‘const std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, int>’