Compilare: main.cpp: In function 'int32_t main()': main.cpp:18:23: 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] 18 | for(int i=1; i<s.size(); i++) | ~^~~~~~~~~ main.cpp:27:23: 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] 27 | for(int i=1; i<s.size(); i++) | ~^~~~~~~~~