[백준] 30019 강의실 예약 시스템 - Greedy / Java

• 문제 링크

30019번: 강의실 예약 시스템

 

• 풀이 코드

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;

public class Main {

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

        int[] arr = new int[read() + 1];
        int m = read();

        while (m-- > 0) {
            int k = read(), s = read(), e = read();
            if (arr[k] <= s) {
                arr[k] = e;
                sb.append("YES\n");
            } else sb.append("NO\n");
        }

        bw.write(sb.toString());
        bw.flush();
    }

    private static int read() throws IOException {
        int c, n = System.in.read() & 15;
        while ((c = System.in.read()) > 32) n = (n << 3) + (n << 1) + (c & 15);

        return n;
    }

}