[백준] 1756 피자굽기?

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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {
	static int N,M,next = Integer.MAX_VALUE;
	static int arr[];
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringTokenizer st = new StringTokenizer(br.readLine());
		N = Integer.parseInt(st.nextToken());
		M = Integer.parseInt(st.nextToken());
		arr = new int[N+1];
		st = new StringTokenizer(br.readLine());
		
		for (int i = 1; i <= N; i++) {
			arr[i] = Integer.parseInt(st.nextToken());
			arr[i] = Math.min(next, arr[i]);
			next = arr[i];
		}
		int left=0,right = N;
		st = new StringTokenizer(br.readLine());
		
		for (int i = 0; i < M; i++) {
			int now = Integer.parseInt(st.nextToken());
			
			while(right>0 && arr[right]<now) {
				right--;
			}
			right--;
			if(right<0) break;
			
		}
		System.out.println(right<0?0:right+1);
	}

}