Compilare: main.cpp: In member function 'void Ahoi::ins(int, int, int)': main.cpp:29:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p == s[ind].size()) { ~~^~~~~~~~~~~~~~~~ main.cpp: In member function 'void Ahoi::get_val()': main.cpp:61:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < t.size (); i++){ ~~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:78:43: 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); ^ main.cpp:79:45: 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); ^