Compilare: main.cpp: In function 'void zfunc(std::string)': main.cpp:11:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 11 | for(int i=1;i<s.size();i++){ | ~^~~~~~~~~ main.cpp:15:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | while(i+z[i]<s.size() and s[z[i]]==s[i+z[i]]){ | ~~~~~~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:31:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for(int i=a.size();i<b.size();i++){ | ~^~~~~~~~~ main.cpp:32:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | if(z[i]==a.size()){ | ~~~~^~~~~~~~~~