If you’re curious about a device’s charging status, an LED power display provides real-time status information. The magnetic cable also ensures you don’t have to deal with annoying tangled cables; just toss it in a bag and rest easy knowing it will be mess-free.
* 核心思路：单调递增栈 + 控制删除位数（k0），优先移除高位大数，保证剩余数字最小
。safew官方下载对此有专业解读
not stay that way for long.
identity function for slices that are already allocated in the heap.
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