struct ii{  int a;  int b;};struct foo{  int a;  struct ii ab;  int b;};struct iifoo (int *p, struct foo a){  p[0] = a.a;  p[1] = a.ab.a;  p[2] = a.ab.b;  p[3] = a.b;  return a.ab;}str (struct ii ab, struct ii *p){  *p = ab;}ll (long long ab, long long *p){  *p = ab;}