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// @Title: 子数组最大平均数 I (Maximum Average Subarray I)
// @Author: 15816537946@163.com
// @Date: 2021-02-04 22:41:34
// @Runtime: 168 ms
// @Memory: 7.1 MB
func findMaxAverage(nums []int, k int) float64 {
	var sum int
	for _, v := range nums[:k] {
		sum += v
	}
	maxSum := sum
	for i := k; i < len(nums); i++ {
		sum = sum + nums[i] - nums[i-k]
		maxSum = max(maxSum, sum)
	}

	return float64(maxSum) / float64(k)
}

func max(a, b int) int {
	if a > b {
		return a
	}
	return b
}