Compilare: main.cpp: In function 'int numar(std::string&, int&)': main.cpp:12:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 12 | while(isdigit(s[it]) && it<s.size()) nr=nr*10+s[it]-'0',it++ ; | ~~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:38:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | while(it<s.size()) | ~~^~~~~~~~~