需要索引（如算距离、下标）：栈存索引，用 nums[stack.at(-1)] 取值比较。
tee() splits a stream into two branches. It seems straightforward, but the implementation requires buffering: if one branch is read faster than the other, the data must be held somewhere until the slower branch catches up.
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创作者或许可以直接在3D空间中布置虚拟摄像机，规划其运动轨迹，而AI则负责实时渲染出该视角下的视频流。Seedance 2.0的“导演模式”可以看作是这一方向的早期雏形。，详情可参考heLLoword翻译官方下载
9VitestStrong DefaultTesting