Compilare: main.cpp: In function 'void Z(int, std::__cxx11::string)': main.cpp:9:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1,l=0,r=0;j<s.size();j++) ~^~~~~~~~~ main.cpp:15:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j+z[i][j]<s.size() && s[j+z[i][j]]==s[z[i][j]]) ~~~~~~~~~^~~~~~~~~