Leetcode 275 Solution

This article provides solution to leetcode question 275 (h-index-ii).
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https://leetcode.com/problems/h-index-ii

Solution

class Solution {
public:
    int hIndex(vector<int>& citations) {
        int l = 0;
        int r = citations.size() - 1;
        
        while (l <= r)
        {
            int m = (l + r) / 2;
            
            if (citations[m] >= citations.size() - m)
                r = m - 1;
            else
                l = m + 1;
        }
        
        return citations.size() - l;
    }
};