H-Index
Given an array of integers citations where citations[i] is the number of citations a researcher received for their i^th paper, return the researcher's h-index.
According to the definition of h-index on Wikipedia: 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.
Example 1
Input
citations = [3,0,6,1,5]Output
3The researcher has 3 papers with at least 3 citations each and the remaining two with no more than 3 citations each, so the h-index is 3.
Example 2
Input
citations = [1,3,1]Output
1The researcher has at least 1 paper with at least 1 citation, but not at least 2 papers with at least 2 citations each, so the h-index is 1.
Constraints
- n == citations.length
- 1 <= n <= 5000
- 0 <= citations[i] <= 1000