Compilare: user.cpp: In function ‘std::vector<int> FindPrefixes(const string&)’: user.cpp:13:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < s.size(); ++i) { ^ user.cpp: In function ‘std::vector<int> KMP(const string&, const string&)’: user.cpp:29:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < t.size() && matches.size() < 1000; ++i) { ^ user.cpp:34:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k == w.size()) { ^