以下是源码

#include <iostream>
  
using namespace std;
  
int a[10000];
  
int b[10000
  
int c[10000];
  
int ans1, ans2;
  
int jishu1, jishu2;
  
double lans1,lans2;
  
int main()
  
{
  
	int n, k;
	cin >> n >> k;
	for (int i = 1;i <= n;i++)
		c[i] = i;
	for (int j = 1;j <= n;j++)
	{
		if (c[j] % k == 0)
		{
			a[j] = c[j];
			jishu1++;
		}
		else
		{
			b[j] = c[j];
			jishu2++;
		}
	}
	for (int l = 1;l <= n;l++)
	{
		ans1 = a[l] + ans1;
	}
	for (int p = 1;p <= n;p++)
	{
		ans2 = ans2 + b[p];
	}
	lans1 = (double)ans1 / jishu1;
	lans2 = (double)ans2 / jishu2;
	printf("%.1lf", lans1);
	printf("%.1lf", lans2);
	return 0;
}