Compilare: main.cpp: In function 'int main()': main.cpp:41:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 41 | for (int i = 1; i < d1.size() and i < d2.size(); i++) | ~~^~~~~~~~~~~ main.cpp:41:45: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 41 | for (int i = 1; i < d1.size() and i < d2.size(); i++) | ~~^~~~~~~~~~~