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.
class Solution:
def hIndex(self, citations: List[int]) -> int:
n = len(citations)
counts = [0] * (n + 1)
for c in citations:
counts[min(c, n)] += 1
k, s = n, counts[n]
while k > s:
k -= 1
s += counts[k]
return k
