哦
by 中2少年雷耶斯 @ 2017-07-19 14:43:23
······
by 星际守恒 @ 2017-08-06 10:19:17
哦
by Dilute @ 2017-08-13 22:05:45
666
by zhshyi @ 2017-08-17 08:49:15
为你点赞
by 冥王S级 @ 2017-08-17 12:01:11
如果你有想法，可以在题解中发表。
by Hydra_ @ 2017-08-17 20:31:23
@[硝酸氢亚银](/space/show?uid=24081) 评论就服你，666
by xujian @ 2017-09-10 14:58:02
666
by yyyyyyy @ 2017-09-16 16:43:16
const a:array[1..18]of int64=（1,2,5,14,42,132,429,1430,4862,16796,58786,208012,742900,2674440,9694845,35357670,129644790,477638700);
```cpp
var i,j,k,m,n:longint;s:int64;
begin
readln(n);
writeln(a[n]);
end.
你写的太烦了。。。
```
by 菜鸟ztc @ 2017-10-02 19:02:13
@[硝酸氢亚银](/space/show?uid=24081) 这么水的题目也去写一篇题解？？？
by 菜鸟ztc @ 2017-10-02 19:04:26