Boj11651.java

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

public class Boj11651 {
	public static void main(String[] args) throws NumberFormatException, IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int N = Integer.parseInt(br.readLine());
		int[][] arr = new int[N][2];
		for(int i=0; i<N;i++) {
			String[] data = br.readLine().split(" ");
			arr[i][0] = Integer.parseInt(data[0]);
			arr[i][1] = Integer.parseInt(data[1]);
		}
		
		Arrays.sort(arr, new Comparator<int[]>() {

			@Override
			public int compare(int[] o1, int[] o2) {
				if(o1[1] == o2[1]) {
					return o1[0] - o2[0];
				}else {
					return o1[1] - o2[1];
				}
			}
			
		});
		
		for(int i=0; i<N;i++) {
			System.out.println(arr[i][0] + " " + arr[i][1]);
		}
	}
}