Compilare: main.cpp: In function 'int main()': main.cpp:42:19: 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] 42 | for(int z=0; z<s.size(); z++) | ~^~~~~~~~~ main.cpp:58:33: 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] 58 | if(z==s.size()-1) | ~^~~~~~~~~~~~ main.cpp:68:33: 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] 68 | if(z==s.size()-1) | ~^~~~~~~~~~~~ main.cpp:78:33: 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] 78 | if(z==s.size()-1) | ~^~~~~~~~~~~~ main.cpp:88:33: 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] 88 | if(z==s.size()-1) | ~^~~~~~~~~~~~