WA求助

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！