Compilare: main.cpp: In function 'int main()': main.cpp:19:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 19 | for (int i=1; i<s.size(); i++) | ~^~~~~~~~~ main.cpp:23:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | while (i+z[i]<s.size() && s[z[i]]==s[i+z[i]]) | ~~~~~~^~~~~~~~~