力扣275.H指数 II
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二分答案
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class Solution {public:int hIndex(vector<int>& citations) {int n = citations.size();auto check = [&](int mid) -> bool{int res=0;for(int i=0;i<n;i++){if(citations[i] >= mid) res++;if(res >= mid) return true;}return false;};int l = 0,r = n;while(l<r){int mid = l+r+1>>1;if(check(mid)) l = mid;else r=mid-1;}return l;}};
