Compilare: main.cpp: In function 'void update(Trie*, char*)': main.cpp:23:13: warning: NULL used in arithmetic [-Wpointer-arith] if (*s == NULL) { ^~~~ main.cpp: In function 'bool erase(Trie*, char*)': main.cpp:35:13: warning: NULL used in arithmetic [-Wpointer-arith] if (*s == NULL) { ^~~~ main.cpp: In function 'int query(Trie*, char*)': main.cpp:50:13: warning: NULL used in arithmetic [-Wpointer-arith] if (*s == NULL) ^~~~ main.cpp: In function 'int prefix(Trie*, char*, int)': main.cpp:58:13: warning: NULL used in arithmetic [-Wpointer-arith] if (*s == NULL) ^~~~ main.cpp: In function 'int main()': main.cpp:68:26: warning: format '%s' expects argument of type 'char*', but argument 3 has type 'char (*)[101]' [-Wformat=] fscanf (fin, "%s", &s); ^ main.cpp:73:12: warning: unused variable '_' [-Wunused-variable] bool _ = erase (T, s); ^ main.cpp:68:27: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%s", &s); ^