Compilare: main.cpp: In function 'int main()': main.cpp:59:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 59 | for(int i = 1; i <= y.size(); i++) { | ~~^~~~~~~~~~~ main.cpp: In function 'int char_to_int(char)': main.cpp:37:1: warning: control reaches end of non-void function [-Wreturn-type] 37 | } | ^