Tags: "leetcode", "python", access_time 1-min read

H-Index

Created: October 27, 2018 by [lek-tin]

Last updated: October 27, 2018

Given an array of citations (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

Input: citations = [3,0,6,1,5]
Output: 3

Explanation [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. Since the researcher has 3 papers with at least 3 citations each and the remaining two with no more than 3 citations each, her h-index is 3.

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

Solution

class Solution:
    def hIndex(self, citations):
        """
        :type citations: List[int]
        :rtype: int
        """
        citations.sort(reverse=True)
        hIndex = 0
        for i in range(len(citations)):
            if i < citations[i]:
                hIndex = i + 1
        return hIndex