Compilare: main.cpp: In function 'void insert(Trie*, char*, int)': main.cpp:39:15: warning: NULL used in arithmetic [-Wpointer-arith] if (*w == NULL) ^~~~ main.cpp: In function 'int main()': main.cpp:108:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n%d\n", s, &n); ^ main.cpp:112:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", a); ^