Compilare: main.cpp: In function 'int main()': main.cpp:25:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | for(int i = 0; i<s.size(); i++) | ~^~~~~~~~~ main.cpp:47:59: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 47 | while(s[i] - '0' >= 0 && s[i] - '0' <= 9 && i < s.size()) | ~~^~~~~~~~~~