Compilare: main.cpp: In function 'int main()': main.cpp:64:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | for (int i = 0; i < s.size(); i++) | ~~^~~~~~~~~~ main.cpp: In function 'P getP(char)': main.cpp:25:1: warning: control reaches end of non-void function [-Wreturn-type] 25 | } | ^