Compilare: main.cpp: In member function 'void Solver::buildPrefix()': main.cpp:24:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 24 | for (int i = 2; i < A.size(); ++i) { | ~~^~~~~~~~~~ main.cpp: In member function 'void Solver::kmp()': main.cpp:35:23: 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 = 1; i < B.size(); ++i) { | ~~^~~~~~~~~~ main.cpp:40:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 40 | if (p == A.size() - 1) { // we have a match; | ~~^~~~~~~~~~~~~~~