Compilare: user.cpp: In function ‘int main()’: user.cpp:81:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<text.size();++i) { ^ user.cpp:92:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<nodes[cur].out.size();++j) { ^ user.cpp:69:37: 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:70:39: 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); ^