说明

算法提高&nbsp 输出正反三角形&nbsp  
时间限制：1.0s&nbsp  &nbsp 内存限制：512.0MB
 &nbsp  &nbsp
使用循环结构打印下述图形，打印行数n由用户输入。图中每行事实上包括两部分，中间间隔空格字符数m也由用户输入。
样例输入n,m:&nbsp
5&nbsp &nbsp 4
样例输出:
&nbsp &nbsp &nbsp &nbsp *&nbsp &nbsp &nbsp &nbsp *********
&nbsp &nbsp &nbsp ***&nbsp &nbsp &nbsp &nbsp *******
&nbsp &nbsp *****&nbsp &nbsp &nbsp &nbsp *****
&nbsp *******&nbsp &nbsp &nbsp &nbsp ***
*********&nbsp &nbsp &nbsp &nbsp *

注意：两行之间没有空行。