신입 사원 - 1946번

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내 코드

package com.company;

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

public class Main {
    static int T, N;
    static int[][] arr;

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

        T = Integer.parseInt(br.readLine());

        for (int i = 0; i < T; i++) {
            N = Integer.parseInt(br.readLine());
            arr = new int[N][2];
            int count = N;

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

            Arrays.sort(arr, (o1, o2) -> {
                return o1[0] - o2[0];
            });

            int min = arr[0][1];

            for (int j = 1; j < N; j++) {
                if (min < arr[j][1])
                    count--;
                min = Math.min(min, arr[j][1]);
            }

            System.out.println(count);
        }
    }
}