delete pics to save space

history_source/信息学奥赛一本通/1.4.4.4.cpp

@@ -0,0 +1,23 @@
+#include<iostream>
+using namespace std;
+bool is(int n)
+{
+	if(n%7==0) return 0;
+	do
+	{
+		if(n%10==7) return 0;
+		n/=10;
+	}
+	while(n);
+	return 1; 
+}
+int main()
+{
+	int n;
+	cin>>n;
+	int ans=0;
+	for(int i=1;i<=n;i++)
+		if(is(i)) ans+=i*i;
+	cout<<ans<<endl;
+	return 0;
+}