Compilare: main.cpp: In function 'int32_t main()': main.cpp:13:18: 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] 13 | for(int i=0;i<s.size();i++) | ~^~~~~~~~~ main.cpp:17:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::set<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 17 | for(int i=1;i<=kok.size();i++) | ~^~~~~~~~~~~~