Compilare: user.cpp: In member function ‘void aho_corasick::compute_delta_pi()’: user.cpp:25:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<q.size();i++) ^ user.cpp: In member function ‘std::vector<int> aho_corasick::get_freq(char*)’: user.cpp:54:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:89:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ahocorasick.in", "r", stdin); ^ user.cpp:90:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ahocorasick.out", "w", stdout); ^ user.cpp:92:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n%d",sir,&n); ^ user.cpp:95:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("\n%s",sir1); ^