Compilare: main.cpp: In function 'std::vector<int> z_function(const string&)': main.cpp:18:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | for(int i = 1; i < s.size(); i++) { | ~~^~~~~~~~~~ main.cpp:23:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | while(i + z[i] < s.size() && s[i + z[i]] == s[z[i]]) { | ~~~~~~~~~^~~~~~~~~~