Compilare: user.cpp: In function ‘int main()’: user.cpp:18:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < locations.size() && i < 1000; ++i) { ^ user.cpp: In function ‘std::vector<int> KMP(std::string, std::string)’: user.cpp:36:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos_input < input.size()) { ^ user.cpp:37:99: 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:40:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pos_substr == substr.size()) result.push_back(pos_input - pos_substr); ^