Compilare: main.cpp: In function 'bool verif(std::__cxx11::string, std::__cxx11::string)': main.cpp:18:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k=0;k<b.size();k++) { ~^~~~~~~~~ main.cpp:22:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (aa==a.size()) { ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:36:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (str.size()>lmax) { ~~~~~~~~~~^~~~~ main.cpp:40:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (str.size()==lmax && str<maxstr) { ~~~~~~~~~~^~~~~~