Compilare: user.cpp: In function ‘void add(Trie*, char*, int)’: user.cpp:17:14: warning: NULL used in arithmetic [-Wpointer-arith] if(*p == NULL){ ^ user.cpp: In function ‘void find(Trie*, char*, int, int)’: user.cpp:26:14: warning: NULL used in arithmetic [-Wpointer-arith] if(*p == NULL){ ^ user.cpp: In function ‘void get(int)’: user.cpp:48:16: warning: unused variable ‘put’ [-Wunused-variable] int p = 1, put; ^ user.cpp: In function ‘int main()’: user.cpp:67:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("xormax.in", "r", stdin); ^ user.cpp:68:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("xormax.out", "w", stdout); ^ user.cpp:69:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:70:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ user.cpp:75:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^