Compilare: main.cpp: In function 'int Z(std::__cxx11::string)': main.cpp:11:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1,l=0,r=0;i<s.size();i++) ~^~~~~~~~~ main.cpp:17:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i+z[i]<s.size() && s[z[i]]==s[i+z[i]]) ~~~~~~^~~~~~~~~ main.cpp:28:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=b.size();i<s.size();i++) ~^~~~~~~~~