int dxx[] = {-1,0,1,0}; /// dxx[3] , dyy[3] -> left
int dyy[] = {0,1,0,-1};


void GridTraverse(int row , int col)
{
    vis[row][col] = 1;
    for(int i = 0 ; i < 4 ; i++){
        int x = row + dxx[i] , y = col + dyy[i];
        if(IsValid(x,y) && vis[x][y] == 0) GridTraverse(x,y);
    }
}