Compilare: user.cpp: In function ‘int main()’: user.cpp:57:41: warning: passing NULL to non-pointer argument 2 of ‘void* memset(void*, int, size_t)’ [-Wconversion-null] memset(hash, NULL, MOD * sizeof(nod *)); ^ user.cpp:59:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int N; fscanf(fin, "%d", &N); ^ user.cpp:61:47: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int tip, x; fscanf (fin, "%d%d", &tip, &x); ^