机器人的运动范围

机器人的运动范围

题目描述

地上有一个m行和n列的方格。一个机器人从坐标0,0的格子开始移动,每一次只能向左,右,上,下四个方向移动一格,但是不能进入行坐标和列坐标的数位之和大于k的格子。 例如,当k为18时,机器人能够进入方格(35,37),因为3+5+3+7 = 18。但是,它不能进入方格(35,38),因为3+5+3+8 = 19。请问该机器人能够达到多少个格子?
package com.test;

public class RobotMove {
	int[] matrix = null;
	boolean isRight(int rowpos,int colpos,int threshold){
		String rowpo = Integer.toString(rowpos);
		String colpo = Integer.toString(colpos);
		int sum = 0;
		for(int i = 0;i < rowpo.length(); i++)
			sum += (rowpo.charAt(i)-'0');
		for(int i = 0;i < colpo.length(); i++)
			sum += (colpo.charAt(i)-'0');
		if(sum>threshold)
			return false;
		return true;
	}
	void Cover(int threshold,int rowpos,int colpos,int rows,int cols){
		if((rowpos+1)<rows&&colpos<cols&&isRight(rowpos+1,colpos,threshold)&&matrix[(rowpos+1)*cols+colpos]==0){
			matrix[(rowpos+1)*cols+colpos] = 1;
			Cover(threshold,rowpos+1,colpos,rows,cols);
		}
		if(rowpos<rows&&(colpos+1)<cols&&isRight(rowpos,colpos+1,threshold)&&matrix[rowpos*cols+colpos+1]==0){
			matrix[rowpos*cols+colpos+1] = 1;
			Cover(threshold,rowpos,colpos+1,rows,cols);
		}
		if(rowpos-1>=0&&colpos<cols&&isRight(rowpos-1,colpos,threshold)&&matrix[(rowpos-1)*cols+colpos]==0){
			matrix[(rowpos-1)*cols+colpos] = 1;
			Cover(threshold,rowpos-1,colpos,rows,cols);
		}
		if(rowpos<rows&&colpos-1>=0&&isRight(rowpos,colpos-1,threshold)&&matrix[rowpos*cols+colpos-1]==0){
			matrix[rowpos*cols+colpos-1] = 1;
			Cover(threshold,rowpos,colpos-1,rows,cols);
		}
	}
    public int movingCount(int threshold, int rows, int cols)
    {
    	if(threshold<0)
    		return 0;
        matrix = new int[rows*cols];
        for(int i = 0;i < rows*cols; i++)
        	matrix[i] = 0;
        matrix[0] = 1;
        Cover(threshold,0,0,rows,cols);
        int count = 0;
        for(int i = 0;i < rows*cols; i++){
//        	System.out.print(matrix[i]+" ");
//        	if(i%cols==(cols-1))
//        		System.out.println();
        	if(matrix[i]==1)
        		count++;
        }
        	
        return count;
    }
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		RobotMove rm = new RobotMove();
		System.out.println(rm.movingCount(5,10,10));
	}

}

  

posted @ 2016-08-02 16:48  再见,少年  Views(162)  Comments(0Edit  收藏  举报