为什么全错 QWQ

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#include <bits/stdc++.h>
using namespace std;
int main(){
	int n,k,sum=0,sum2=0,wei,wei2;
	double a,b;
	scanf("%d %d",&n,&k);
	for(int i=1;i<=n;i++){
		if(i%k==0){
			wei++;
			sum+=i;
		}
		else{
			wei2++;
			sum2+=i;
		}
	}
	a=double(sum)/wei;
	b=double(sum2)/wei2;
	printf("%.1lf %.1lf",a,b);
	return 0;
}