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class Solution {
public:
    int hIndex(vector<int>& citations) {
        sort(citations.begin(), citations.end(), greater<int>());
        int size = citations.size();
        int max = 0;
        for (int i = 0; i < size; i++)
        {
            if (citations[i] >= i + 1)
            {
                max = i + 1;
            }
        }
        return max;
    }
};