leetcode274.H指数

直接排序完后进行遍历 

class Solution {
    public int hIndex(int[] citations) {
        Arrays.sort(citations);
        int result = 0;
        for (int i = citations.length-1; i >=0; i--) {
            if(citations[i]>=citations.length-i)
                result=citations.length-i;
            else
                break;
        }
        return result;
    }
}