Compilare: user.cpp: In function ‘std::vector<int> prefix(const string&)’: user.cpp:13:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (auto i = 1; i < s.size(); ++i) { ^ user.cpp: In function ‘std::vector<int> match(const string&, const string&)’: user.cpp:32:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (auto i = 0; i < t.size(); ++i) { ^