Compilare: user.cpp: In function ‘std::vector<int> get_match(const string&, const string&, const std::vector<int>&)’: user.cpp:25:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < B.size(); ++i) { ^ user.cpp:32:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k == A.size() - 1) { ^ user.cpp: In function ‘int main()’: user.cpp:73:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < S.size(); ++i) { ^ user.cpp:72:27: warning: unused variable ‘hits’ [-Wunused-variable] long long answer = 0, hits = 0; ^