简单的演示,N的大小可以改变的,而且这个程序的速度还可以,

比以前我用递归写的那个快多了.如果N改得太大输出会有问题，

因为我用到gotoxy的,这个程序主要是练一个算法-simple demonstration, N size can be changed, but the rate of this procedure can also, than in the past I used to write a recursive that quicker. If N is too big change in exports, gotoxy because I used, the process is mainly a training algorithm