Compilare: user.cpp: In function ‘std::vector<int> KMP(std::string, std::string)’: user.cpp:25:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos_input < input_size) { ^ user.cpp:26:87: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos_substr != -1 && (substr[pos_substr] != input[pos_input] || pos_substr == substr_size)) pos_substr = positions.at(pos_substr); ^ user.cpp:29:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pos_substr == substr_size) result.push_back(pos_input - pos_substr); ^