Compilare: main.cpp: In function 'int main()': main.cpp:29:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | if (mx < it->second.size()) | ~~~^~~~~~~~~~~~~~~~~~~ main.cpp:35:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | else cnt += (mx == it->second.size()); | ~~~^~~~~~~~~~~~~~~~~~~~ main.cpp:37:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | for (int i = 0; i < itmax->second.size(); i++) | ~~^~~~~~~~~~~~~~~~~~~~~~