Compilare: main.cpp: In function 'int main()': main.cpp:13:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 13 | for (int i = 2, j = 0; i < concat.size(); ++i) { | ~~^~~~~~~~~~~~~~~ main.cpp:23:48: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | for (int i = 2 * pattern.size() + 1; i < concat.size(); ++i) { | ~~^~~~~~~~~~~~~~~ main.cpp:24:28: 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] 24 | if (lps[i] == pattern.size()) {