小白必做
No testdata at current.
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.
题目描述
没有输出和输入 小白必做！！！！！！！！
Samples
No testdata at current.
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.
没有输出和输入 小白必做！！！！！！！！
