Compilare: main.cpp: In function 'std::vector<int> prefix_function(const std::string&)': main.cpp:12:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 12 | for(int i = 1; i < P.size(); i++) | ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:27:33: 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(int i = A.size() + 1; i < S.size(); i++) | ~~^~~~~~~~~~ main.cpp:28:22: 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] 28 | if(prefix[i] == A.size())