Compilare: main.cpp: In function 'int main()': main.cpp:24:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 24 | while(i<s.size()){ | ~^~~~~~~~~ main.cpp:30:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | while(i<s.size() && s[i]<='9' && s[i]>='0'){ | ~^~~~~~~~~ main.cpp:36:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 36 | if(i<s.size()){ | ~^~~~~~~~~