Compilare: main.cpp: In function 'std::vector<int> z_function(std::string)': main.cpp:17:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 17 | for(int i = 1; i < s.size(); i++) { | ~~^~~~~~~~~~ main.cpp:24:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 24 | while(i + z[i] < s.size() && s[i + z[i]] == s[z[i]]) { | ~~~~~~~~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:68:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 68 | for(int i = z.size() - 1; i >= 2 * z.size() / 3; i--) { | ~~^~~~~~~~~~~~~~~~~~~ main.cpp:69:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 69 | if(i + z[i] == s.size() && f[z[i]] >= 2) { | ~~~~~~~~~^~~~~~~~~~~