Compilare: main.cpp: In function 'std::vector<int> z_function(std::string)': main.cpp:16:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 16 | for(int i = 1; i < s.size(); i++) { | ~~^~~~~~~~~~ main.cpp:21:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | while(i + z[i] < s.size() && s[i + z[i]] == s[z[i]]) { | ~~~~~~~~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:47:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 47 | for(int i = 0; i < z.size(); i++) { | ~~^~~~~~~~~~ main.cpp:63:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 63 | if(i + z[i] == s.size() && f[z[i]] >= 2) { | ~~~~~~~~~^~~~~~~~~~~