Compilare: main.cpp: In function 'int main()': main.cpp:68:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 68 | for(i=0;i<b.size();i++){ | ~^~~~~~~~~ main.cpp:77:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 77 | for(i=a.size()-1;i<b.size();i++){ | ~^~~~~~~~~