Compilare: main.cpp: In function 'void prefix()': main.cpp:13:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 13 | for(int i=1;i<s.size();i++) | ~^~~~~~~~~ main.cpp:17:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 17 | while(i+z[i]<s.size()&&s[z[i]]==s[i+z[i]]) | ~~~~~~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:33:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | for(int i=a.size();i<s.size();i++) | ~^~~~~~~~~ main.cpp:34:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | if(z[i]==a.size()) | ~~~~^~~~~~~~~~