Compilare: main.cpp: In function 'int main()': main.cpp:35:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | for (int i = pat.size() + 1; i < str.size(); ++i) | ~~^~~~~~~~~~~~ main.cpp:36:17: warning: comparison of integer expressions of different signedness: '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'} and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 36 | if (pref[i] == pat.size()) {