delete pics to save space

history_source/信息学奥赛一本通/1.6.1.15.cpp

@@ -0,0 +1,38 @@
+#include<cstdio>
+using namespace std;
+int fan(int n)
+{
+	int ans=0;
+	do
+	{
+		ans=ans*10+n%10;
+		n/=10;
+	}
+	while(n);
+	return ans;
+}
+bool isp(int n)
+{
+	if(n<=1) return 0;
+	for(int i=2;i*i<=n;i++) if(n%i==0) return 0;
+	return 1;
+}
+int main()
+{
+	bool f=0;
+	int a,b;
+	scanf("%d%d",&a,&b);
+	for(int i=a;i<=b;i++)
+	{
+		if(isp(i)&&isp(fan(i)))
+		{
+			if(f) printf(",");
+			else f=1;
+			printf("%d",i);
+		}
+	}
+	if(!f) printf("No");
+	printf("\n");
+	return 0;
+}
+