代码如下

#include <iostream>
#include <cstdio>
using namespace std;
int main(){
	int n , k , aa = 0 , bb = 0;
	cin >> n >> k;
	float a = 0 , b = 0;
	for (int i = 2; i < n; ++i)
	{
		if (i % k == 0)
		{
			aa++;
			a = a + i;
		}
		if (i % k != 0)
		{
			bb++;
			b = b + i;
		}	
	}
	printf("%.1f",a / aa);
	printf(" ");
	printf("%.1f",b / bb);
}

为什么只有20分???