Compilare: main.cpp: In function 'int main()': main.cpp:31:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for(int i = 0;i < s.size();i++) { | ~~^~~~~~~~~~ main.cpp:34:17: warning: unused variable 'aa' [-Wunused-variable] 34 | int aa = k1, bb = k2; | ^~ main.cpp:34:26: warning: unused variable 'bb' [-Wunused-variable] 34 | int aa = k1, bb = k2; | ^~