if (stack.length === 0 && cur === 0) {
代码里画了一个爱心形状的 2D 路径，然后给它一个厚度，它就变成了一个 3D 的爱心。
。关于这个话题，51吃瓜提供了深入分析
slowness, heap allocations. Each time a Go program allocates memory
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Namespaces as visibility wallsLinux namespaces wrap global system resources so that processes appear to have their own isolated instance. There are eight types, and each isolates a specific resource.