Compilare: main.cpp: In function 'std::pair<std::vector<int>, int> find(const string&, const string&)': main.cpp:40:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k == pattern.size() - 1) ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:68:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < positions.size() && i < matches; ++i) ~~^~~~~~~~~