Compilare: main.cpp: In function 'bool ok(std::string, std::string)': main.cpp:10:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 10 | while (i < a.size() && j < b.size()) { | ~~^~~~~~~~~~ main.cpp:10:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 10 | while (i < a.size() && j < b.size()) { | ~~^~~~~~~~~~ main.cpp:15:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | if (i == a.size()) | ~~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:31:29: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 31 | if (s[i].size() > mx) { | ~~~~~~~~~~~~^~~~ main.cpp:35:34: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 35 | else if (s[i].size() == mx && s[i] < s1) | ~~~~~~~~~~~~^~~~~