剑指offer No.66 机器人的运动范围

2022-11-26 11:08:40 浏览数 (1)

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

代码语言:javascript复制
//
// Created by jiangxingqi on 2019/4/16.
//
#include <iostream>
class Solution {
public:
    int movingCount(int threshold, int rows, int cols)
    {
        bool* visited = new bool[rows*cols];
        memset(visited, 0, rows*cols);
        int count = movingCountCore(threshold, rows, cols, 0, 0, visited);
        delete[]visited;
        return count;
    }
    int movingCountCore(int threshold, int rows, int cols, int row, int col, bool* visited)
    {
        int count = 0;
        if (check(threshold, rows, cols, row, col, visited))
        {
            visited[row*cols   col] = true;
            count = 1   movingCountCore(threshold, rows, cols, row, col - 1, visited)  
                    movingCountCore(threshold, rows, cols, row - 1, col, visited)  
                    movingCountCore(threshold, rows, cols, row, col   1, visited)  
                    movingCountCore(threshold, rows, cols, row   1, col, visited);
        }
        return count;
    }

    /*该函数检查坐标为(row,col)的方格能够进入*/
    bool check(int threshold, int rows, int cols, int row, int col, bool*visited)
    {
        if (row >= 0 && row < rows&&col >= 0 && col < cols
            &&getDigitSum(row)   getDigitSum(col) <= threshold
            && !visited[row*cols   col])
            return true;
        return false;
    }

    /*计算一个数的所有位数之和*/
    int getDigitSum(int number)
    {
        int sum = 0;
        while (number > 0)
        {
            sum  = number % 10;
            number = number / 10;
        }
        return sum;
    }
};
int main() {
    Solution *ss=new Solution();
    int count = ss->movingCount(4,10,10);
    std::cout << count << std::endl;
    return 0;
}

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