안녕하세요
FESTIVAL 문제를 푸는데 도저히 오답의 원인을 모르겠네요.....

도와주세요 ㅜㅜ 오답이 되는 경우가 어떤 것이 있을까요....

//FESTIVAL

import java.util.Scanner;
import java.util.StringTokenizer;

public class Main {

public static void main(String[] args) {

    Scanner scan = new Scanner(System.in);

    int n = Integer.parseInt(scan.nextLine());
    double[] result = new double[n];

    for (int i = 0; i < n; i++) {
        StringTokenizer st = new StringTokenizer(scan.nextLine(), " ");
        int cnt = Integer.parseInt(st.nextToken());
        int day = Integer.parseInt(st.nextToken());
        int[] days = new int[cnt];

        for(int j = 0; j < cnt; j++){
            days[j] = scan.nextInt();
        }

        double sum = 999999;
        int day_cnt = 0;

        for(int j = 0; j < cnt-day+1; j++){
            double tmp = CheckSum(days, j, j+day);
            if(tmp/day <= sum){
                sum = tmp/day;
                for(int k = j + day; k <= cnt; k++){
                    tmp = CheckSum(days, j, k);
                    if(tmp/(k-j) <= sum){
                        sum = tmp/(k-j);
                    }
                }
            }
        }

        result[i] = sum;

        scan.nextLine();
    }

    for(double res : result){
        System.out.format("%.10f\n", res);
    }
    scan.close();
}

public static double CheckSum(int[] days, int start, int end){
    double sum = 0;
    for(int i = start; i < end; i++){
        sum += days[i];
    }
    return sum;
}

}