delete pics to save space

history_source/ccf 入门篇/U4/4.1.2.cpp

@@ -0,0 +1,25 @@
+#include<iostream>
+using namespace std;
+int main()
+{
+	long double s=1;
+	for(int i=2;i<=100;i++)
+	{
+		if(i%2==1) s=s-i;
+		else s=s+i;
+	}
+	cout<<int(s)<<endl;
+	s=0;
+	for(int i=1;i<=10;i++)
+	{
+		s=s+i*(11-i);
+	}
+	cout<<int(s)<<endl;
+	s=0;
+	for(int i=1;i<=100;i++)
+	{
+		s=s+1.0/i;
+	}
+	cout<<s;
+	while(true);
+}