Compilare: user.cpp: In function ‘void bak(int, int, int, long long int)’: user.cpp:16:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(niv == divi.size() || exponenti > 47 || factori > 47) ^ user.cpp:15:9: warning: unused variable ‘i’ [-Wunused-variable] int i; ^ user.cpp: In function ‘int main()’: user.cpp:48:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i <sol.size(); i++) ^