方向遍历顺序说明下一个倒序（从右往左）先处理右侧，栈里存「右侧候选」上一个正序（从左往右）先处理左侧，栈里存「左侧候选」
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Apple’s satellite features are included for free for two years starting at the time of activation of a new iPhone 14 or later, and are not available in all markets. For Emergency SOS via satellite availability, visit support.apple.com/en-us/HT213426. For Messages via satellite availability, visit support.apple.com/en-us/120930. For Roadside Assistance via satellite availability, visit support.apple.com/en-us/105098. Apple’s satellite features were designed for use in open spaces with a clear line of sight to the sky. Performance may be impacted by obstructions such as trees or surrounding buildings.，更多细节参见体育直播
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Оказавшиеся в Дубае российские звезды рассказали об обстановке в городе14:52，推荐阅读搜狗输入法下载获取更多信息
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