_274.java

package com.fishercoder.solutions.firstthousand;

import java.util.Arrays;

public class _274 {
    public static class Solution1 {
        public int hIndex(int[] citations) {
            if (citations == null || citations.length == 0) {
                return 0;
            }

            Arrays.sort(citations);
            for (int i = 0; i < citations.length; i++) {
                if (citations[i] >= citations.length - i) {
                    return citations.length - i;
                }
            }
            return 0;
        }
    }
}