Compilare: main.cpp: In function 'bool comp(s, s)': main.cpp:19:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 19 | for(int i = 0; i< a.w.length(); i++){ | ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:26:13: warning: unused variable 'k' [-Wunused-variable] 26 | int k = 1; | ^