Compilare: user.cpp: In function ‘TRIE* add(TRIE*, char*)’: user.cpp:24:18: warning: NULL used in arithmetic [-Wpointer-arith] if(str[0] == NULL) ^ user.cpp: In function ‘int cauta(TRIE*, char*)’: user.cpp:37:18: warning: NULL used in arithmetic [-Wpointer-arith] if(str[0] == NULL) ^ user.cpp: In function ‘void b2(int, char*)’: user.cpp:64:14: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] str[num] = NULL; ^ user.cpp: In function ‘int main()’: user.cpp:94:38: warning: ‘dr’ may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%d %d %d\n",valmax,st,dr); ^ user.cpp:94:38: warning: ‘st’ may be used uninitialized in this function [-Wmaybe-uninitialized]