delete pics to save space

history_source/ccf 入门篇/U5/5.2.3.cpp

@@ -0,0 +1,13 @@
+#include<iostream>
+using namespace std;
+int main()
+{
+	bool p[52];
+	for(int i=0;i<52;i++) p[i]=1;
+	for(int i=2;i<=52;i++)
+	{
+		for(int a=1;a*i<=52;a++) p[a*i-1]=!p[a*i-1];
+	}
+	for(int i=0;i<52;i++) if(p[i]) cout<<i+1<<" ";
+	while(true);
+}