[백준 Java] 정렬: - 10814번: 나이순 정렬

 

 

import java.io.*;
import java.util.Arrays;
import java.util.Comparator;
import java.util.StringTokenizer;

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

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

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

        Arrays.sort(arr, new Comparator<String[]>() {
            // 나이순 정렬
            public int compare(String[] s1, String[] s2) {
                return Integer.parseInt(s1[0]) - Integer.parseInt(s2[0]);
            }
        });

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

        bw.write(String.valueOf(sb));

        br.close();
        bw.flush();
        bw.close();
    }
}