199. H-Index

MediumSorting

Given an array of integers citations where citations[i] is the number of citations a researcher received for their ith paper, return the researcher's h-index. The h-index is defined as the maximum value of h such that the given researcher has published at least h papers that have each been cited at least h times.

Examples

Input: [3,0,6,1,5]

Output: 3

Explanation: Three papers have at least 3 citations each.

Constraints

  • n == citations.length
  • 1 <= n <= 5000
  • 0 <= citations[i] <= 1000
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