题解 | #明明的随机数#

TreeSet

import java.io.InputStreamReader;
import java.io.BufferedReader;
import java.io.IOException;
import java.util.Comparator;
import java.util.Set;
import java.util.TreeSet;

public class Main {
    public static void main(String args[]) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        String str;
        int n = Integer.parseInt(reader.readLine());
        Set<String> set = new TreeSet<>(new Comparator<String>() {
            @Override
            public int compare(String o1, String o2) {
                Integer first = Integer.parseInt(o1);
                Integer second = Integer.parseInt(o2);
                return first - second;
            }
        });
        while ((str = reader.readLine()) != null) {
            set.add(str);
        }
        reader.close();

        for (String s : set) {
            System.out.println(s);
        }
    }
}