Compilare: user.cpp: In function ‘std::vector<int> Match(std::string, std::string)’: user.cpp:23:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (++j == pat.size()) ^ user.cpp: In function ‘int main()’: user.cpp:30:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.in", "r", stdin); ^ user.cpp:31:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.out", "w", stdout); ^