Compilare: user.cpp: In function ‘void sterge(trie*, char*)’: user.cpp:37:12: warning: NULL used in arithmetic [-Wpointer-arith] if (*s == NULL) ^ user.cpp: In function ‘int searchAparitie(trie*, char*)’: user.cpp:50:12: warning: NULL used in arithmetic [-Wpointer-arith] if (*s == NULL) ^ user.cpp: In function ‘int getMaxNumber(trie*, char*)’: user.cpp:68:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i<strlen(s); i++) ^