arr.push(p.val); // 存储节点值而非节点本身，简化后续操作
If you're looking for AR glasses that can be used as a productivity tool, giving you an extra screen while you work, then Xreal is by far the better choice. But for entertainment, the Air 4 Pros are going to be hard to beat, especially for the price. If money is no object, then check out the ROG Xreal R1 AR Gaming Glasses.
Фото: Vincent Thian / AP，更多细节参见雷电模拟器官方版本下载
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// 核心过滤：弹出栈中「≤当前元素」的数（易错点2：必须是≤，不是<）。谷歌浏览器【最新下载地址】对此有专业解读