https://www.luogu.com.cn/problem/P5719

唠唠：别看这题很水，且只要求保留小数点后一位，倘若用float而不是double的话就无法AC，洛谷评测则只有40分。所以一定要用double！
总结：能用double就别用float

Code
`#include

include

include

include

include

include

include

using namespace std;

int main()
{
int n,k,n1=0,n2=0;
double s1=0.0,s2=0.0;
cin>>n>>k;
for(int i=1;i<=n;i++)
{
if(i%k==0)
{
s1+=i;
n1++;
}
else
{
s2+=i;
n2++;
}
}

printf("%.1lf %.1lf",s1/n1,s2/n2);
return 0;

}
`