标准解法是二分法,但这样子提交也给过了,其时间复杂度为 O(n)
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   | class Solution { public:     int hIndex(vector<int>& citations) {         for(int i = 0; i < citations.size(); i++){             if (citations[i] >= citations.size()-i){                 return citations.size()-i;             }         }         return 0;     } };
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力扣:https://leetcode.cn/problems/h-index-ii/description/