Compilare: main.cpp: In function 'bool verificare(std::string)': main.cpp:15:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | for(int i=0;i<biti.length();i++) | ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:80:24: warning: unused variable 'sum' [-Wunused-variable] 80 | int prod=1,sum=0; | ^~~