经典打印三角形的思路

另类思路

###*###   blackCount = 3 = 4 - 1   starCount = 1 = 1 * 2 - 1
##***##	  blackCount = 2 = 4 - 2   starCount = 3 = 2 * 2 - 1
#*****#   blackCount = 1 = 4 - 3   starCount = 5 = 3 * 2 - 1
*******   blackCount = 0 = 4 - 4   starCount = 7 = 4 * 2 - 1

如上图，为了直观，使用#代表空格。

• blackCount为左边空格数量，右边空格可以忽略。
• starCount 为星星数量