今天是摆子的一天，明天我要肝一整天的第四题！！！

 

PS：一个普通的排序罢了

import java.io.*;
import java.util.Arrays;
import java.util.Scanner;

/**
 * @ClassName 考勤刷卡
 * @Description TODO
 * @Author 小怂很怂
 * @Date 2023/3/8 21:43
 * @Version 1.0
 **/
public class Main {
    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    static StreamTokenizer st = new StreamTokenizer(br);
    static PrintWriter pw = new PrintWriter(new OutputStreamWriter(System.out));

    public static void main(String[] args) throws Exception {
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int []arr=new int[n];
        for (int i=0;i<n;i++){
            String  ss=sc.next();
            arr[i]=sc.nextInt();
        }
        Arrays.sort(arr);
        for (int i=1;i<n;i++){
            if (arr[i]!=arr[i-1]) pw.println(arr[i-1]);
        }
        pw.println(arr[n-1]);
        pw.flush();//必须加
    }

    public static int nextInt() throws Exception {//int型
        st.nextToken();
        return (int) st.nval;
    }

    public static long nextLong() throws Exception {//long型
        st.nextToken();
        return (long) st.nval;
    }
}