delete pics to save space

history_source/信息学奥赛一本通/1.6.1.13.cpp

@@ -0,0 +1,18 @@
+#include<cstdio>
+#include<cstring>
+int main()
+{
+	int x,y,ans=0;
+	bool isp[100010];
+	memset(isp,1,sizeof(isp));
+	isp[0]=isp[1]=0;
+	for(int i=2;i*i<100010;i++)
+		if(isp[i])
+			for(int j=2;j*i<100010;j++)
+				isp[j*i]=0;
+	scanf("%d%d",&x,&y);
+	if(x<=y) for(int i=x;i<=y;i++) ans+=isp[i];
+	else for(int i=y;i<=x;i++) ans+=isp[i];
+	printf("%d\n",ans);
+	return 0;
+}