Flood Fill

class Solution {
public:
     void helper(vector<vector<int>>& image, int i , int j , int color , vector < vector <int> > &visited  , int m , int n , int pix)
     {
         if( j >= image[0].size() || i >= image.size() )
         {
             return ; 
         }
         image[i][j] = color ; 
         visited[i][j] = 1 ; 
         int a[4] = {1 , 0 , -1, 0} ; 
         int b[4] = {0 , 1, 0 , -1};
         for(int k = 0 ; k < 4 ; k++)
         {
           
             int x = a[k] ;
             int y = b[k] ; 
           //  cout << i + x << j + y << endl ; 
             if(i + x < m  && j + y < n && i + x >= 0 && j + y >= 0 && visited[i + x][j + y] == 0  && image[i + x][j + y] == pix)
             {
              //   cout << "hey" << endl ;
                 helper(image , i + x ,j + y , color , visited , m , n , pix);
             }
         }

         
     }
    
    vector<vector<int>> floodFill(vector<vector<int>>& image, int sr, int sc, int color) {
        int m = image.size() ; 
        int n = image[0].size() ; 
        vector<vector<int>>  visited ( m , vector <int>(n , 0) ) ; 
        int pix = image[sr][sc] ;
        helper(image, sr , sc ,  color , visited  ,  m , n, pix) ;
        return image ;  
        
    }
};