[백준 10814] [정렬] [JAVA] 나이순 정렬

 

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.Comparator;

public class Main {
    public static void main(String[] args) {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int N = 0;

        try{
            N = Integer.parseInt(br.readLine());
        }catch (Exception e){
            e.printStackTrace();
        }

        String[][] arr = new String[N][2];
        String[] read = new String[2];

        for(int i=0;i<N;i++){
            try{
                read = br.readLine().split(" ");
            }catch (Exception e){
                e.printStackTrace();
            }
            arr[i][0] = read[0];
            arr[i][1] = read[1];
        }

        Arrays.sort(arr, new Comparator<String[]>() {
            @Override
            public int compare(String[] o1, String[] o2) {
                return Integer.parseInt(o1[0]) - Integer.parseInt(o2[0]);
            }
        });

        for(int i=0;i<N;i++){
            System.out.println(arr[i][0] + " "+ arr[i][1]);
        }
    }
}