Cook all but confirmed that Apple is about to reveal its newest MacBooks in the coming days. His tweet features a short video of someone shaping an Apple logo on a surface that appears to have the company’s classic space gray colorway.
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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」