你可以看编译信息。
你如果要使用 memset，需要引用 `cstring` 头文件。
by Ew_Cors @ 2023-10-23 21:15:15
```cpp
#include<iostream>
#include<bits/stdc++.h>
using namespace std;
const int maxn = 30 + 10;
const int maxmx = 30000 + 10;
int a[maxn], f[maxmx], sum = 0, ans = 0;;
int main(){
int T; cin >> T;
while(T--){
memset(f, 0, sizeof(f));
sum = 0;
ans = 0;
int m; cin >> m;
for(int i = 1; i <= m; i++){
cin >> a[i];
sum += a[i];
}
sort(a + 1, a + m + 1);
f[0] = 1;
for(int i = 1; i <= m; i++){
ans += f[a[i]];
for(int j = sum; j >= a[i]; j--) f[j] += f[j - a[i]];
}
cout << ans << "\n";
}
return 0;
}
```
改了万头就对了[提交记录](https://www.luogu.com.cn/record/131264859)
by Unstoppable_wangqing @ 2023-10-23 21:17:34
你头文件没了，少了个cstring
by EthanC_ @ 2023-10-23 21:42:24
@[Ew_Cors](/user/180103) 谢谢dalao
by wangjue233 @ 2023-10-24 16:16:58
@[EthanC_](/user/517086) 谢谢LCdalao
by wangjue233 @ 2023-10-24 16:17:37
@[Amongus_Blue](/user/926913) 谢谢dalao
by wangjue233 @ 2023-10-24 16:18:04