Compilare: user.cpp: In function ‘void mk_sa(const string&, std::vector<int>&)’: user.cpp:26:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ord.size(); ++i){ ^ user.cpp:29:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] de_sort[i].val2 = (i+step < str.size() ? ord[i+step] : -1); } ^ user.cpp:33:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < de_sort.size(); ++i){ ^