```cpp
#include<iostream>
#include<cmath>
#include<algorithm>
#include<string>
#include<iomanip>
#include<cstring>
#define int long long
using namespace std;
long long res[100833],ans;
long long n,a[100833],k;
void dfs(int cur){
if(cur==n*2+1){
int sum=0;
for(int i=1;i<=n*2;i++){
//cout<<res[i]<<" ";
if(res[i]==1){
sum+=a[i];
}
}
//cout<<endl;
if(sum>=k){
ans++;
}
return;
}
res[cur]=1;
dfs(cur+1);
res[cur]=0;
dfs(cur+1);
}
signed main(){
cin>>n;
for(int i=1;i<=n;i++){
cin>>a[i];
}
cin>>k;
long long b[100833];
for(int i=1;i<=n;i++){
b[i]=a[i];
}
// for(int i=1;i<=n;i++){
// cout<<b[i]<<" ";
// }
// cout<<endl;
for(int i=n,j=1;i<=n*2,j<=n;j++,i++){
a[i]=b[j];
}
dfs(0);
cout<<ans;
}
```
by kkk_fans @ 2022-06-24 19:57:21
希望更丰富的展现？使用Markdown、LaTeX。
by ivyjiao @ 2022-06-24 20:31:24