代码（不要管bool isu[]=...，判断素数的）：

#include<bits/stdc++.h>
using namespace std;
bool 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int n,r,s=0; 
int a[30],b[30],x[30];
void dfs(int k){
	if(k>r){
		int sum=0;
		for(int i=1;i<=r;i++){if(a[i]<a[i-1])return;}
		for(int i=1;i<=r;i++){sum+=a[i];}
		if(isu[sum]){s++;cout<<sum<<"　";}
	}else{
		for(int i=1;i<=n;i++){
			if(b[i]==0){
				b[i]=1;
				a[k]=x[i];
				dfs(k+1);
				b[i]=0;
			}
		}
	}
}
int main(){
	cin>>n>>r;
	for(int i=1;i<=n;i++){cin>>x[i];}
dfs(1);
cout<<s;
} /*
3 2
1 1 1


*/