Compilare: main.cpp: In function 'int main()': main.cpp:13:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 13 | for (int d = 0; d < s.size(); d++) | ~~^~~~~~~~~~ main.cpp:15:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | for (int i = 0; i < s.size() - d; i++) | ~~^~~~~~~~~~~~~~