文章目录
一、题目
274. H-Index
Given an array of integers citations where citations[i] is the number of citations a researcher received for their ith paper, return the researcher's h-index.
According to the definition of h-index on Wikipedia: The h-index is defined as the maximum value of h such that the given researcher has published at least h papers that have each been cited at least h times.
Example 1:
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, their h-index is 3.
Example 2:
Input: citations = [1,3,1]
Output: 1
Constraints:
n == citations.length
1 <= n <= 5000
0 <= citations[i] <= 1000
题目来源：leetcode
二、题解
cpp
class Solution {
public:
int hIndex(vector<int>& citations) {
int n = citations.size();
sort(citations.begin(),citations.end());
int hIndex = 0;
for(int i = 0;i < n;i++){
//剩余几篇文章
int paperNums = n - i;
//若当前引用值已经大于等于剩余文章数
if(citations[i] >= paperNums) return paperNums;
if(paperNums >= citations[i] && citations[i] > hIndex){
hIndex = citations[i];
}
}
return hIndex;
}
};