思路：① 找初始左边界：第一个 nums[i] nums[i+1]；② 找初始右边界：最后一个 nums[i] < nums[i-1]；③ 求 [left,right] 内 min、max；④ 向左扩展：nums[left-1] minVal 则 left--；⑤ 向右扩展：nums[right+1] < maxVal 则 right++。长度 = right - left + 1。
激活函数的核心作用就是为神经网络引入非线性。
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Health Secretary Wes Streeting has promised to act on her final recommendations, which will be published in June.
"I would have gone into the river and down the tunnel and that would have been the end of me.