Compilare: main.cpp: In function 'long long int huffmanEncoding(const std::vector<long long int>&, std::vector<std::pair<int, std::__cxx11::basic_string<char> > >&)': main.cpp:38:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | for (int i = 0; i < frequencies.size(); i++) { | ~~^~~~~~~~~~~~~~~~~~~~