Compilare: main.cpp: In function 'bool este(std::__cxx11::string, std::__cxx11::string)': main.cpp:23:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i <= s2.length()-s1.length(); i++) { ~~^~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:27:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(currchar < s1.size() && found) { ~~~~~~~~~^~~~~~~~~~~ main.cpp:29:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = currpos; j < s2.length() && !found; j++) ~~^~~~~~~~~~~~~ main.cpp:36:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(currchar == s1.size()) return true; ~~~~~~~~~^~~~~~~~~~~~