좌표 정렬하기.java

//  좌표 정렬하기

import java.util.*;
import java.lang.*;
import java.io.*;

class Main {
    static int arr[][];

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb = new StringBuilder();

        int n = Integer.parseInt(br.readLine());
        arr = new int [n][2];

        for (int i = 0; i < n; i++) {
            StringTokenizer st = new StringTokenizer(br.readLine());
            arr[i][0] = Integer.parseInt(st.nextToken());
            arr[i][1] = Integer.parseInt(st.nextToken());
        }

        Arrays.sort(arr, (arr1, arr2) -> {
            if(arr1[0] == arr2[0]) {
                return arr1[1] - arr2[1];
            }
            else {
                return arr1[0] - arr2[0];
            }
        });

        for (int i = 0; i < n; i++) {
            sb.append(arr[i][0] + " " + arr[i][1]).append('\n');
        }

        System.out.println(sb);
    }
}