H-Index LeetCode solution in C++

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