Given an integer array A, find if an integer p exists in the array such that the number of integers greater than p in the array equals to p.
First and only argument is an integer array A.
Return 1 if any such integer p is found else return -1.
A = [3, 2, 1, 3]
A = [1, 1, 3, 3]
For integer 2, there are 2 greater elements in the array. So, return 1.
There is no such integer exists.
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