import java.util.*; import java.util.zip.*; import java.util.List; import java.util.regex.*; import java.util.concurrent.*; import java.util.concurrent.atomic.*; import java.util.concurrent.locks.*; import javax.swing.*; import javax.swing.event.*; import javax.swing.text.*; import javax.swing.table.*; import java.io.*; import java.net.*; import java.lang.reflect.*; import java.lang.ref.*; import java.lang.management.*; import java.security.*; import java.security.spec.*; import java.awt.*; import java.awt.event.*; import java.awt.image.*; import javax.imageio.*; import java.math.*; class main { static IterableIterator countBackwardsTo1(int a) { return countDownIterator_exclusive(a, 0); } static IterableIterator countDownIterator_exclusive(int a, int b) { return new IterableIterator() { int i = a; public boolean hasNext() { return i > b; } public Integer next() { return i--; } }; } // you still need to implement hasNext() and next() static abstract class IterableIterator implements Iterator, Iterable { public Iterator iterator() { return this; } public void remove() { unsupportedOperation(); } } static Iterator iterator(Iterable c) { return c == null ? emptyIterator() : c.iterator(); } static UnsupportedOperationException unsupportedOperation() { throw new UnsupportedOperationException(); } static Iterator emptyIterator() { return Collections.emptyIterator(); } }