최댓값과 최솟값(Lv.2)[프로그래머스]

import java.util.*;
class Solution {
    public int solution(int[] citations) {
        List<Integer> sort = new ArrayList<>();
        for (int i : citations){
            sort.add(i);
        }
        int hDex = 0;
        sort.sort(Collections.reverseOrder());

        for (int i = 0; i< sort.size(); i++){
            if (sort.get(i)>=i+1){
                hDex = i +1;
            }
            if (sort.get(i)<i+1) break;
        }

        return hDex;
    }
}

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