Zombie virus, Java

Zombie virus

//'main' method must be in a class 'Rextester'.
//Compiler version 1.8.0_111

import java.util.*;
import java.lang.*;

class Rextester
{  
    public static int[] xPoint = { 1, 0, 0, -1 };
	public static int[] yPoint = { 0, 1, -1, 0 };
	static int count, count2;
    
    public static void main(String args[])
    {
        Readfile();
    }
    
    public static void CCTVToEnd(int xBegin, int yBegin, int xEnd, int yEnd, int[][] matrix, int zombieTouchEnd, int size,
			int step) {
		if (step == zombieTouchEnd && xBegin == xEnd && yBegin == yEnd) {
			count2++;
		} else {
			for (int i = 0; i < 4; i++) {
				int tempX = xBegin + xPoint[i];
				int tempY = yBegin + yPoint[i];
				
				if (step < zombieTouchEnd) {
					if (0 <= tempX && tempX < size && 0 <= tempY && tempY < size
							&& (matrix[tempX][tempY] == 0 || matrix[tempX][tempY]==2)) {
						int a=matrix[tempX][tempY];
						matrix[tempX][tempY] = 5;
						CCTVToEnd(tempX, tempY, xEnd, yEnd, matrix, zombieTouchEnd, size, step + 1);
						if(tempX==xEnd&&tempY==yEnd) {
							matrix[tempX][tempY] = 2;
						}else {
							matrix[tempX][tempY] = 0;
						}
					}
				}
			}
		}

}
    
    public static void BeginToCCTV(int xBegin, int yBegin, int xCCTV, int xEnd, int yEnd, int yCCTV, int[][] matrix,
			int zombieTouchCCTV, int zombieTouchEnd, int size, int step) {

if (step == zombieTouchCCTV && xBegin == xCCTV && yBegin == yCCTV) {
			count++;
			CCTVToEnd(xCCTV, yCCTV, xEnd, yEnd, matrix, zombieTouchEnd, size, step);
		} else {
			for (int i = 0; i < 4; i++) {
				int tempX = xBegin + xPoint[i];
				int tempY = yBegin + yPoint[i];
				if (step < zombieTouchCCTV) {
					if (0 <= tempX && tempX < size && 0 <= tempY && tempY < size
							&& (matrix[tempX][tempY] == 0 || matrix[tempX][tempY] == 3)) {
						matrix[tempX][tempY] = 4;
						BeginToCCTV(tempX, tempY, xCCTV, xEnd, yEnd, yCCTV, matrix, zombieTouchCCTV, zombieTouchEnd, size,
								step + 1);
						if(tempX==xCCTV&&tempY==yCCTV) {
							matrix[tempX][tempY] = 3;
						}else {
							matrix[tempX][tempY] = 0;
						}	
					}
				}
				
			}
		}
	}
    
    public static void Readfile() {
		BufferedReader reader;
		try {
			reader = new BufferedReader(new FileReader("D:\\Long\\Homework\\Zombie virus\\input.txt"));
			String line = reader.readLine();
			int case_seat = Integer.parseInt(line);
			line = reader.readLine();
			while (line != null) {
				String[] size_matrix = line.split("\\s+");
				if (size_matrix.length == 2) {
					int size = Integer.parseInt(size_matrix[0]);
					int zombieTouchEnd = Integer.parseInt(size_matrix[1]);
					int[][] matrix = new int[size][size];
					line = reader.readLine();
					String[] zombie = line.split("\\s+");
					int xBegin = Integer.parseInt(zombie[0]);
					int yBegin = Integer.parseInt(zombie[1]);
					int xEnd = Integer.parseInt(zombie[2]);
					int yEnd = Integer.parseInt(zombie[3]);
					// System.out.println(xBegin + " " + yBegin + " " + xEnd + " " + yEnd);
					line = reader.readLine();
					String[] CCTV = line.split("\\s+");
					int xCCTV = Integer.parseInt(CCTV[0]);
					int yCCTV = Integer.parseInt(CCTV[1]);
					int zombieTouchCCTV = Integer.parseInt(CCTV[2]);
					line = reader.readLine();

for (int row = 0; row < size; row++) {
						for (int col = 0; col < size; col++) {
							matrix[xBegin - 1][yBegin - 1] = 1;
							matrix[xEnd - 1][yEnd - 1] = 2;
							matrix[xCCTV - 1][yCCTV - 1] = 3;
						}
					}
					count = 0;
					count2 = 0;
					BeginToCCTV(xBegin-1, yBegin-1, xCCTV-1, xEnd-1, yEnd-1, yCCTV-1, matrix, zombieTouchCCTV, zombieTouchEnd, size, 0);
					System.out.println(count2);
				}
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}


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