class Higher
{
 public static void map(IntToInt obj,int[] a,int n)
 // Map (destructively) the function represented by
 // obj onto the first n integers of a
 {
  for(int i=0; i<n; i++)
     a[i]=obj.func(a[i]);
 }

 public static int[] zip(IntIntToInt obj,int[] a,int[] b, int n)
 // Create a new array of length n by applying the function
 // represented by obj to pairs of integers from a and b
 {
  int[] c = new int[n];
  for(int i=0; i<n; i++)
     c[i]=obj.func(a[i],b[i]);
  return c;
 }
}