```cpp
#include<bits/stdc++.h>
using namespace std;
long long n1,n2;
int main()
{
long long sum=0;
scanf("%lld%lld",&n1,&n2);
for(int i=n1;i<=n2;i++)
if (abs(i%4)!=2) sum++;
cout<<sum;
return 0;
}
请参见代码
```
by 徒司王 @ 2017-10-07 14:43:52
就是整么简单
by 徒司王 @ 2017-10-07 14:44:44
@[lizibai](/space/show?uid=54964)
http://www.cnblogs.com/z360/p/7846659.html
这个网站里的公式有问题？
by 陈梓熠 @ 2018-01-25 14:04:38
@[lizibai](/space/show?uid=54964)
666
by 夜殇 @ 2018-02-20 20:37:56
@[lizibai](/space/show?uid=54964)
请不要把正确代码发在讨论区
谢谢
by 郑涵希 @ 2018-05-27 16:52:50