题目
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."
For example, given citations = [3, 0, 6, 1, 5], which 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, his h-index is 3.
代码
class Solution(object):
def hIndex(self, citations):
"""
:type citations: List[int]
:rtype: int
"""
if citations==None or len(citations)==0:
return 0
citations.sort()
n = len(citations)
h_index = 0
for i in range(n-1, -1, -1):
if n - i >= citations[i]:
if citations[i] > h_index:
h_index = citations[i]
else:
if n - i > h_index:
h_index = n-i
return h_index
