275. H 指数 II 
为保证权益,题目请参考 275. H 指数 II(From LeetCode).
解决方案1 
Python 
python
# 275. H 指数 II
# https://leetcode-cn.com/problems/h-index-ii/
from typing import List
class Solution:
    def hIndex(self, citations: List[int]) -> int:
        i = -1
        n = 1
        for i in range(len(citations) - 1, -1, -1):
            if citations[i] >= n:
                n += 1
            else:
                break
        return n - 1
if __name__ == "__main__":
    so = Solution()1
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