[백준] 25400 제자리 - Greedy / Java

• 문제 링크

25400번: 제자리

 

• 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));

        int n = read(), t = n;

        int i = 1;
        while (t-- > 0) if (read() == i) i++;

        bw.write(String.valueOf(n - i + 1));
        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;
    }

}