delete pics to save space

1.1036.cpp

@@ -0,0 +1,22 @@
+#include<cstdio>
+inline bool isp(int n)
+{
+	for(int i=2;i*i<=n;i++) if(n%i==0) return false;
+	return n>=2;
+}
+int n,k,res;
+int x[25];
+int main()
+{
+	scanf("%d%d",&n,&k);
+	for(int i=0;i<n;i++) scanf("%d",&x[i]);
+	for(int i=0;i<(1<<n);i++)
+		if(__builtin_popcount(i)==k)
+		{
+			int s=0;
+			for(int j=0;j<n;j++) if(i&(1<<j)) s+=x[j];
+			if(isp(s)) res++;
+		}
+	printf("%d\n",res);
+	return 0;
+}