Compilare: main.cpp: In function 'bool check(std::string)': main.cpp:37:19: 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] 37 | for(int i=0; i<s.size(); i++) | ~^~~~~~~~~ main.cpp: In function 'void addCuv(std::string)': main.cpp:54:19: 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] 54 | for(int i=0; i<s.size(); i++) | ~^~~~~~~~~