# 643 子数组最大平均数 I

class Solution {
    public double findMaxAverage(int[] nums, int k) {
        double r = 0;
        int s = 0;
        for (int i = 0; i < k; i++) {
            s += nums[i];
        }

        r = s;

        for (int i = 1; i < nums.length - k + 1; i++) {
            s = s - nums[i - 1] + nums[i + k - 1];
            r = Math.max(s, r);
        }
        return r / k;
    }
}