Compilare: user.cpp: In function ‘std::vector<int> calc_pali(const string&)’: user.cpp:7:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1, st = 0; i < str.size(); ++i){ ^ user.cpp:10:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i-j-1 >= 0 && i+j+1 < str.size() && str[i-j-1] == str[i+j+1]) ++j; ^ user.cpp: In function ‘std::vector<int> build_dyn(const std::vector<int>&)’: user.cpp:19:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < pali.size(); ++i){ ^