Compilare: main.cpp: In function 'int main()': main.cpp:54:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 54 | for(j = 0; j<s.size(); j++) | ~^~~~~~~~~ main.cpp:57:50: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 57 | while(s[j] >= '0' && s[j] <= '9' && j<s.size()) | ~^~~~~~~~~ main.cpp:66:54: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 66 | while(s[j] >= '0' && s[j] <= '9' && j<s.size()) | ~^~~~~~~~~