Compilare: user.cpp: In function ‘std::vector<int> buildAutomaton(const string&)’: user.cpp:17:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < s.size(); ++i) { ~~^~~~~~~~~~ user.cpp: In function ‘std::pair<std::vector<int>, int> computeMatches(const string&, const string&, int)’: user.cpp:41:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < haystack.size(); ++i) { ~~^~~~~~~~~~~~~~~~~ user.cpp:50:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k == needle.size()) { ~~^~~~~~~~~~~~~~~~ user.cpp:53:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (firstMatches.size() < limit) { ~~~~~~~~~~~~~~~~~~~~^~~~~~~ user.cpp:51:27: warning: ‘matchesCount’ may be used uninitialized in this function [-Wmaybe-uninitialized] ++matchesCount; ^