Compilare: main.cpp: In function 'int main()': main.cpp:74:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 74 | for (i=0; i<s.size (); i++) | ~^~~~~~~~~~ main.cpp:90:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 90 | for (i=0; i<s.size (); i++) | ~^~~~~~~~~~