Compilare: main.cpp: In function 'int32_t main()': main.cpp:25:27: 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] 25 | for (int i = 0; i < num.size(); ++i) { | ~~^~~~~~~~~~~~ main.cpp:27:35: 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] 27 | for (int j = i + 1; j < num.size(); ++j) { | ~~^~~~~~~~~~~~ main.cpp:38:27: 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] 38 | for (int i = 0; i < num.size(); ++i) { | ~~^~~~~~~~~~~~