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++) ^ user.cpp: In function ‘int main()’: user.cpp:87:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trie.in","r",stdin); ^ user.cpp:88:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trie.out","w",stdout); ^