求n的阶
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输出一个数n，求n的阶。
请使用递归完成。
5! = 5*4*3*2*1 = 120
样例输入1
5
样例输出1
120
样例输入2
6
样例输出2
720
You cannot submit for this problem because the contest is ended. You can click "Open in Problem Set" to view this problem in normal mode.
输出一个数n，求n的阶。
请使用递归完成。
5! = 5*4*3*2*1 = 120
样例输入1
5
样例输出1
120
样例输入2
6
样例输出2
720