Compilare: user.cpp: In function ‘void add(const int&, const int&)’: user.cpp:75:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < hs[line].size(); ++i) { // chiar daca nu o sa adaugi niciodata aceeasi valoare din nou .. ^ user.cpp: In function ‘void change(const int&, const int&)’: user.cpp:85:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < hs[line].size(); ++i) { ^ user.cpp: In function ‘int take(const int&)’: user.cpp:95:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < hs[line].size(); ++i) { ^