Compilare: user.cpp: In constructor ‘FiniteAutomaton::Node::Node()’: user.cpp:46:44: warning: passing NULL to non-pointer argument 2 of ‘void* memset(void*, int, size_t)’ [-Wconversion-null] memset(sons, NULL, sizeof(sons)); ^ user.cpp: In member function ‘void FiniteAutomaton::buildPi()’: user.cpp:80:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < Q.size() ; ++ i) { ^ user.cpp: In member function ‘void FiniteAutomaton::AhoCorasick(char*)’: user.cpp:95:13: warning: unused variable ‘n’ [-Wunused-variable] int n = strlen(A); ^