# 274. H-Index

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 {
public:
int hIndex(vector<int>& citations) {
sort(citations.begin(), citations.end(), greater<int>());
for (int i = 0; i < citations.size(); ++i) {
if (i >= citations[i]) return i;
}
return citations.size();
}
};
``````

H-Index II

https://leetcode.com/problems/h-index/

LeetCode All in One 题目讲解汇总(持续更新中…)

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