[백준] 11651번 좌표 정렬하기2 java

https://www.acmicpc.net/problem/11651

11651번: 좌표 정렬하기 2

 

 

java

arrays.sort 사용하기

package javastd1;

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

public class bj11651 {

	public static void main(String[] args) throws NumberFormatException, IOException {
		// TODO Auto-generated method stub
		
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		
		int n = Integer.parseInt(br.readLine());
		int[][] arr = new int[n][2];
		
		StringBuilder sb = new StringBuilder();
		
		StringTokenizer st;
		
		//1. x,y좌표 입력받기
		for(int i=0; i<n; i++) {
			st = new StringTokenizer(br.readLine());
			arr[i][0] = Integer.parseInt(st.nextToken());
			arr[i][1] = Integer.parseInt(st.nextToken());			
		}
		//2. y좌표 오름차순 정렬, x좌표 오름차순 정렬
		Arrays.sort(arr, (arr1,arr2) -> {
			if(arr1[1] == arr2[1]) {
				return arr1[0] - arr2[0];
			}
			else {
				return arr1[1] - arr2[1];
			}
		});
		//3. 정렬한 좌표 순서대로 문자열 붙이기
		for(int i=0; i<n; i++) {
			sb.append(arr[i][0] + " " + arr[i][1]).append('\n');
		}
		//4. 출력
		System.out.println(sb);
		
	}

}