//输入一个整形的数组int[] a，与需要查找的int key,

//返回key经过排序后的下标（索引值），可以但没有改进为之前的下标

//对多个key来讲，只能返回一个,应该很容易但是没有实现返回所有的key的下标

//如果找不到，则返回-1

//不足之处是要先排序-//Enter a plastic array int [] a, and the need to find int key,// return key after the post-sort subscr ipt (index value), can be improved but not before the subscr ipt// on a number key to speaking, only to return one should be easy to achieve but did not return the key to all of the subscr ipt// If you can not find, then return-1// deficiencies is to sort