Compilare: main.cpp: In function 'int main()': main.cpp:16:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 16 | for( int i = 0; i < s.size(); ++i ) | ~~^~~~~~~~~~ main.cpp:30:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | for( int i = 0; i < s.size(); ++i ) | ~~^~~~~~~~~~