Compilare: main.cpp: In function 'int kmp(const string&)': main.cpp:15:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | for (int i = 1; i < s.size(); i++) { | ~~^~~~~~~~~~ main.cpp:27:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 27 | for (i++; i < s.size(); i++) | ~~^~~~~~~~~~ main.cpp: In function 'bool ok(int, const std::vector<std::__cxx11::basic_string<char> >&)': main.cpp:36:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 36 | for (int i = 0; i + x - 1 < it.size(); i++) | ~~~~~~~~~~^~~~~~~~~~~