Compilare: main.cpp: In function 'void zfunction()': main.cpp:24:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 24 | for (i = 1; i < s.size(); i++) | ~~^~~~~~~~~~ main.cpp:28:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | while (i + z[i] < s.size() and s[i + z[i]] == s[z[i]]) | ~~~~~~~~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:49:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 49 | for (i = a.size(); i < s.size(); i++) | ~~^~~~~~~~~~ main.cpp:50:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | if (z[i] >= a.size()) | ~~~~~^~~~~~~~~~~