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// @Title: 增量元素之间的最大差值 (Maximum Difference Between Increasing Elements)
// @Author: 15816537946@163.com
// @Date: 2022-02-27 15:44:37
// @Runtime: 0 ms
// @Memory: 2.4 MB
func maximumDifference(nums []int) int {
	ans := -1
	for i, preMin := 0, nums[0]; i < len(nums); i++ {
		if nums[i] > preMin {
			ans = max(ans, nums[i]-preMin)
		} else {
			preMin = nums[i]
		}
	}
	return ans

}

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