题目：最大收益
[1,2,3,9,2,3]
思路：这道题竟然是easy的?!
最终的解法非常简单，只要把单个波峰减去波谷就可以了，比如在上面的例子中【1-2-3-9】【2-3】这就是单个波峰波谷！为什么这个解法是正确的呢？
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