Compilare: main.cpp: In member function 'void HuffmanCodes::buildCode(std::vector<int>&, std::vector<long unsigned int>&)': main.cpp:57:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < data.size(); i++) ~~^~~~~~~~~~~~~ main.cpp: In function 'int strToInt(std::__cxx11::string)': main.cpp:84:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a.size(); i++) ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:110:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < freq.size(); i++) sz += set1.rez[i].second.size()*freq[i]; ~~^~~~~~~~~~~~~ main.cpp:112:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < set1.rez.size(); i++) ~~^~~~~~~~~~~~~~~~~