3,4,5WA

#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,k,a[1001];
	float ans1=0,ans2=0,sum1=0,num1=0,sum2=0,num2=0;
	cin>>n>>k;
	for(int i=1;i<=n;i++){
		a[i]=i;
		if(a[i]%k==0){
			num1++;
			sum1+=a[i];
		}
		else{
			num2++;
			sum2+=a[i];
		}
	}
	ans1=sum1*1.0/num1;
	ans2=sum2*1.0/num2;
	printf("%.1f %.1f",ans1,ans2);
	return 0;
} 

求助大佬！！ 谢谢！