如果某个整数x（x> 1）存在一个数组中，则2*x+1和3*x+1也必定在这个数组中，已知1为该数组中的元素，现给定一个整数k（k> 1），要求求出该数组中的第k大的数。例如a[3] {1,2,3}，当k 1，则返回3；k 2，则返回2；k 3，则返回1；k> 4或k<1，输出错误。-If an integer x (x>　 1) exists in an array, then 2* x+ 1 and 3* x+ 1 must also be in this array, known as 1 for the array of elements, given an integer K (k>　 1), it is required to find the number of the kth largest in the array.For example,a[3] {1,2,3},if k　 1 ,then the result is 3 if k 2,then the result is 2 if k 3,then the result is 1 if k> 4 or k<1,then the output is wrong.