Compilare: user.cpp: In constructor ‘Trie::Trie()’: user.cpp:17:38: warning: passing NULL to non-pointer argument 2 of ‘void* memset(void*, int, size_t)’ [-Wconversion-null] memset(fiu, NULL, sizeof(fiu)); ^ user.cpp: In function ‘void addTrie(Trie*, char*)’: user.cpp:24:14: warning: NULL used in arithmetic [-Wpointer-arith] if(*s == NULL){ ^ user.cpp:29:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] int op = code[*s]; ^ user.cpp: In function ‘int main()’: user.cpp:53:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rps.in", "r", stdin); ^ user.cpp:54:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rps.out", "w", stdout); ^ user.cpp:55:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &n, &k, &w, &d); ^ user.cpp:63:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", s); ^