机器人的运动范围

 1 class Solution {
 2 private:
 3     int add(int n)
 4     {
 5         int sum =0;
 6         while(n != 0)
 7         {
 8             sum += n%10;
 9             n = n/10;
10         }
11         return sum;
12     }
13     int move(int threshold, int rows, int cols, int row, int col, int& count, vector<int>&visited)
14     { 
15        if(row>=0 && row<rows && col>=0 && col<cols &&visited[row*cols+col]==0 && 
16           add(row)+add(col)<=threshold)
17        {
18              visited[row*cols+col]=1;
19              count++;
20              move(threshold, rows, cols, row-1, col, count, visited);
21              move(threshold, rows, cols, row, col+1, count, visited);
22              move(threshold, rows, cols, row+1, col, count, visited);
23              move(threshold, rows, cols, row, col-1, count, visited);
24        }
25          
26         return count;
27     }
28 public:
29     int movingCount(int threshold, int rows, int cols)
30     {
31         vector<int> visited(rows*cols,0);
32         int count = 0, col = 0, row = 0;
33      //  visited[0] = 1;
34         return move(threshold, rows, cols, row, col, count, visited);
35     }
36 };