Problem:
Score : 200 points

Problem Statement

You are given an image A composed of N rows and N columns of pixels, and a template image B composed of M rows and M columns of pixels.

A pixel is the smallest element of an image, and in this problem it is a square of size 1×1.

Also, the given images are binary images, and the color of each pixel is either white or black.

In the input, every pixel is represented by a character: . corresponds to a white pixel, and # corresponds to a black pixel.

The image A is given as N strings A_1,...,A_N.

The j-th character in the string A_i corresponds to the pixel at the i-th row and j-th column of the image A (1≦i,j≦N).

Similarly, the template image B is given as M strings B_1,...,B_M.

The j-th character in the string B_i corresponds to the pixel at the i-th row and j-th column of the template image B (1≦i,j≦M).

Determine whether the template image B is contained in the image A when only parallel shifts can be applied to the images.

Constraints

1≦M≦N≦50

A_i is a string of length N consisting of # and ..

B_i is a string of length M consisting of # and ..

Input

The input is given from Standard Input in the following format:

N M
A_1
A_2
:
A_N
B_1
B_2
:
B_M

Output

Print Yes if the template image B is contained in the image A. Print No otherwise.

Sample Input 1

3 2
#.#
.#.
#.#
#.
.#

Sample Output 1

Yes

The template image B is identical to the upper-left 2 × 2 subimage and the lower-right 2 × 2 subimage of A. Thus, the output should be Yes.

Sample Input 2

4 1
....
....
....
....
#

Sample Output 2

No

The template image B, composed of a black pixel, is not contained in the image A composed of white pixels.

Solution in Java (OpenJDK 11.0.6) (judge verdict: Wrong Answer)

import java.util.*;
import java.io.*;
public class Main{
    public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		PrintWriter ou = new PrintWriter(System.out);
		int n = Integer.parseInt(sc.next());
		int m = Integer.parseInt(sc.next());
		char[][] p = new char[n][n];
		char[][] q = new char[m][m];
		String s;
		for(int i = 0 ; i < n ; i++){
			s = sc.next();
			for(int j = 0 ; j < n ; j++) p[i][j] = s.charAt(j);
		}
		for(int i = 0 ; i < m ; i++){
			s = sc.next();
			for(int j = 0 ; j < m ; j++) q[i][j] = s.charAt(j);
		}
		sc.close();
		boolean fin = true;
		for(int i = 0 ; i < n - m && fin ; i++){
			for(int j = 0 ; j < n - m && fin ; j++){
				boolean eq = true;
				for(int ii = i ; ii < i + m ; ii++){
					for(int jj = j ; jj < j + m ; jj++){
						if(p[ii][jj] != q[ii - i][jj - j]) eq = false;
					}
				}
				if(eq) fin = false;
			}
		}
		if(fin) ou.println("No");
		else ou.println("Yes");
		ou.flush();
	}
}