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 Java8 (OpenJDK 1.8.0) (judge verdict: Wrong Answer)


import java.util.Scanner;

public class Main {

    public static void main(String args[]) throws Exception
    {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int M  = sc.nextInt();

        char templateA[][] = new char[N][N];
        char templateB[][] = new char[M][M];

        for(int i=0;i<N;i++){
            String tmp = sc.next();
            for(int j=0;j<N;j++){
                templateA[i][j] = tmp.charAt(j);
            }
        }


        for(int i=0;i<M;i++){
            String tmp = sc.next();
            for(int j=0;j<M;j++){
                templateB[i][j] = tmp.charAt(j);
            }
        }

        boolean foundFlag = false;
        for(int i =0;i<N-M&&!foundFlag;i++){
            for(int j=0;j<N-M&&!foundFlag;j++){
                boolean same = true;
                for(int k=0;k<M&&same;k++){
                    for(int l=0;l<M&&same;l++){
                        if(templateA[i+k][j+l]!=templateB[k][l]){
                            same = false;
                        }
                    }
                }
                if(same) foundFlag = true;
            }
        }

        if (foundFlag){
            System.out.println("Yes");
        }
        else{
            System.out.println("No");
        }

        sc.close();
    }

}