## 题目

Given an array of citations sorted in ascending order (each citation is a non-negative integer) of a researcher, write a function to compute the researcher’s h-index.

According to the definition of h-index on Wikipedia: “A scientist has index h if h of his/her N papers have at least h citations each, and the other N − h papers have no more than h citations each.”

Example:

Note:

If there are several possible values for h, the maximum one is taken as the h-index.

• This is a follow up problem to H-Index, where citations is now guaranteed to be sorted in ascending order.