[백준] 1931번 : 회의실 배정

1931번: 회의실 배정

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문제

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소스 코드

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));

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

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

        Arrays.sort(time, new Comparator<int[]>() {
            @Override
            public int compare(int[] o1, int[] o2) {
                if (o1[1] == o2[1]) {
                    return o1[0] - o2[0];
                }

                return o1[1] - o2[1];
            }
        });

        int cnt = 0;
        int prev_end_time = 0;

        for (int i = 0; i < N; i++) {

            if (prev_end_time <= time[i][0]) {
                prev_end_time = time[i][1];
                cnt++;
            }
        }
        System.out.println(cnt);
    }
}

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참고

[백준] 1931번 : 회의실배정 - JAVA [자바]