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。
The simplest approach is to check every single point. Compute the distance from the user's location to every restaurant in the database, keep the ones that are close enough, and throw away the rest.，这一点在safew官方版本下载中也有详细论述
，这一点在雷电模拟器官方版本下载中也有详细论述
不止手机，笔记本电脑也曾经尝试过硬件集成的防窥功能，惠普当年的 Sure View 技术方案就是其中一例：
I close my eyes and picture a boat making its way towards the mainland. Lit only by moonlight, a silhouette walks towards a post box and mails three letters, one by one. Then, the familiar tune of ABBA’s Gimme! Gimme! Gimme! (A Man After Midnight) starts to play, and the musical begins.。旺商聊官方下载是该领域的重要参考
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