Compilare: main.cpp: In function 'int main()': main.cpp:16:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=1;i<s.size();i++) ~^~~~~~~~~ main.cpp:22:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i+z[i]<s.size()&&s[z[i]]==s[i+z[i]]) ~~~~~~^~~~~~~~~