Compilare: main.cpp: In function 'int main()': main.cpp:27:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 27 | while(index < s.length()) | ~~~~~~^~~~~~~~~~~~ main.cpp:25:20: warning: unused variable 'sum' [-Wunused-variable] 25 | int index = 0, sum = 0; | ^~~