Compilare: main.cpp: In function 'int solve(std::__cxx11::string&, std::__cxx11::string&)': main.cpp:26:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < aux.size(); i++) ~~^~~~~~~~~~~~ main.cpp:32:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (; i < rez.size(); i++) ~~^~~~~~~~~~~~