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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?
代码:
<span style="color:#000099;">import java.util.*; public class Solution { public int movingCount(int threshold, int rows, int cols) { boolean[][] vist = new boolean[rows][cols]; //从开始0,0位置进行BFS搜索 return bfsSearch(0, 0,rows, cols, vist, threshold); } private int bfsSearch(int i, int j, int rows, int cols, boolean[][] vist, int threshold) { //不合法 if(i<0 || i>=rows || j<0 || j>=cols || vist[i][j] ||(numSum(i)+numSum(j)>threshold)) return 0; vist[i][j] = true; //四个方向 return bfsSearch(i-1, j, rows, cols, vist, threshold)+ bfsSearch(i+1, j, rows, cols, vist, threshold)+ bfsSearch(i, j-1, rows, cols, vist, threshold)+ bfsSearch(i, j+1, rows, cols, vist, threshold)+1; } private int numSum(int i) { int sum = 0; while(i != 0) { sum += i%10; i/=10; } return sum; } }</span>
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原文地址:http://blog.csdn.net/baidu_21578557/article/details/51637719