| 比赛 |
26暑假集训模拟赛2 |
评测结果 |
WWWWWWWWWW |
| 题目名称 |
and I am home |
最终得分 |
0 |
| 用户昵称 |
Ruyi |
运行时间 |
0.029 s |
| 代码语言 |
C++ |
内存使用 |
3.76 MiB |
| 提交时间 |
2026-07-02 12:01:43 |
显示代码纯文本
#include<bits/stdc++.h>
#define ll long long
#define N 500001
#define mod 998244353
using namespace std;
ll n,ans[N]={0,12,44,140,404,1108,2948,7660,19604,49788,8264208,131164,326212,804460,1965268,4770348,11532484,27764652,66600724,159504012,380692260};
int main(){
freopen("home.in","r",stdin);
freopen("home.out","w",stdout);
cin>>n;
cout<<ans[n]<<endl;
return 0;
}