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// @Title: 统计数组中峰和谷的数量 (Count Hills and Valleys in an Array)
// @Author: 15816537946@163.com
// @Date: 2022-03-20 10:39:36
// @Runtime: 0 ms
// @Memory: 2.1 MB
func countHillValley(nums []int) int {
	var cnt int
	for i := 1; i < len(nums)-1; i++ {
		if nums[i] == nums[i+1] {
			nums[i] = nums[i-1]
			continue
		}
		if nums[i] > nums[i-1] && nums[i] > nums[i+1] || nums[i] < nums[i-1] && nums[i] < nums[i+1] {
			cnt++
		}
	}

	return cnt

}