package q643

import "math"

func findMaxAverage(nums []int, k int) float64 {
	var maxSum = math.MinInt

	sum := 0
	for i := range nums {
		if i < k-1 {
			sum += nums[i]
		} else {
			sum += nums[i]
			if i >= k {
				sum -= nums[i-k]
			}
			maxSum = max(maxSum, sum)
		}
	}
	return float64(maxSum) / float64(k)
}

var _ = findMaxAverage