加油，谢谢！

Try this testcase:

Test.assertEquals(minSteps([1,1,4,4,8,6]),-1)

sum = 24, 4 apples for each child.
but, the child who has 1 apple can not became to 4 apples ;-)

There should only be one function per word in the current object. This means when you do there only that should be on the current object, no other methods from the rest of the words are allowed in there.