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+```java
+import java.util.Arrays;
+
+public class PGJ_LV2_H_Index {
+
+    private static int len;
+
+    public int solution(int[] citations) {
+        int answer = 0;
+        len = citations.length;
+        Arrays.sort(citations);
+
+        for (int i = 0; i < len; i++) {
+            int h = Math.min(len - i, citations[i]);
+            answer = Math.max(answer, h);
+        }
+        return answer;
+    }
+
+}
+```
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