求助，代码跑参考数据和参考数据1答案都是对的，但是oj跑完却报全错

以下是源码

#include <iostream>

using namespace std;

int a[10000];

int b[10000

int c[10000];

int ans1, ans2;

int jishu1, jishu2;

double lans1,lans2;

int main()

{

    int n, k;
    cin >> n >> k;
    for (int i = 1;i <= n;i++)
        c[i] = i;
    for (int j = 1;j <= n;j++)
    {
        if (c[j] % k == 0)
        {
            a[j] = c[j];
            jishu1++;
        }
        else
        {
            b[j] = c[j];
            jishu2++;
        }
    }
    for (int l = 1;l <= n;l++)
    {
        ans1 = a[l] + ans1;
    }
    for (int p = 1;p <= n;p++)
    {
        ans2 = ans2 + b[p];
    }
    lans1 = (double)ans1 / jishu1;
    lans2 = (double)ans2 / jishu2;
    printf("%.1lf", lans1);
    printf("%.1lf", lans2);
    return 0;
}