Compilare: main.cpp: In function 'void constr_z(std::string)': main.cpp:11:21: 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:16:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 16 | while (i + z[i] < s.size() && s[i + z[i]] == s[z[i]]) | ~~~~~~~~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:38:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | for (int i = b.size() + 1; i < c.size(); ++i) | ~~^~~~~~~~~~ main.cpp:39:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | if (z[i] == b.size()) { | ~~~~~^~~~~~~~~~~