H-Index

Desicription

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:

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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.

Solution

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