大佬们打扰了：哪里错了？

#include <iostream>
#include <cstdio>
using namespace std;
int main() {
    int n, k;
    scanf("%d %d", &n, &k);
    int ans1 = 0, num1 = 0, ans2 = 0, num2 = 0;
    for (int i = 1; i <= n; i++) {
        if (i % k == 0) {
            ans1 += i;
            num1++;
        } else {
            ans2 += i;
            num2++; 
        }
    }
    printf("%.1f ", double(ans1/num1)); 
    printf("%.1f\n", double(ans2/num2));
    return 0;
} 

只有40分