Given an array of integers citations where citations[i] is the number of citations a researcher received for their ith paper, return compute the researcher's h-index.
According to the definition of h-index on Wikipedia: A scientist has an index h if h of their n papers have at least h citations each, and the other n − h papers have no more than h citations each.
If there are several possible values for h, the maximum one is taken as the h-index.
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Example 1:
\n\n\nInput: citations = [3,0,6,1,5]\nOutput: 3\nExplanation: [3,0,6,1,5] means the researcher has 5 papers in total and each of them had received 3, 0, 6, 1, 5 citations respectively.\nSince the researcher has 3 papers with at least 3 citations each and the remaining two with no more than 3 citations each, their h-index is 3.\n\n\n
Example 2:
\n\n\nInput: citations = [1,3,1]\nOutput: 1\n\n\n
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Constraints:
\n\nn == citations.length1 <= n <= 50000 <= citations[i] <= 1000给你一个整数数组 citations ，其中 citations[i] 表示研究者的第 i 篇论文被引用的次数。计算并返回该研究者的 h 指数。
根据维基百科上 h 指数的定义：h 代表“高引用次数”，一名科研人员的 h指数是指他（她）的 （n 篇论文中）总共有 h 篇论文分别被引用了至少 h 次。且其余的 n - h 篇论文每篇被引用次数 不超过 h 次。
如果 h 有多种可能的值，h 指数 是其中最大的那个。
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示例 1：
\n\n\n输入：\n\ncitations = [3,0,6,1,5]\n输出：3 \n解释：给定数组表示研究者总共有5篇论文，每篇论文相应的被引用了3, 0, 6, 1, 5次。\n 由于研究者有3篇论文每篇 至少 被引用了3次，其余两篇论文每篇被引用 不多于3次，所以她的 h 指数是3。
示例 2：
\n\n\n输入：citations = [1,3,1]\n输出：1\n\n\n
\n\n
提示：
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