Compilare: user.cpp: In function ‘void Query()’: user.cpp:55:10: warning: unused variable ‘v’ [-Wunused-variable] char v; ^ user.cpp: In function ‘void addWord(Trie*, char*)’: user.cpp:82:27: warning: NULL used in arithmetic [-Wpointer-arith] if ( tolower(s[0]) == NULL ) ^ user.cpp: In function ‘void increaseRelevance(Trie*, char*)’: user.cpp:103:27: warning: NULL used in arithmetic [-Wpointer-arith] if ( tolower(s[0]) == NULL ) ^ user.cpp: In function ‘void searchWord(Trie*, char*)’: user.cpp:132:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < SS.size(); ++i ) ^