Cgroups: accounting is not securityCgroups (control groups) limit and account for resource usage: CPU, memory, disk I/O, number of processes. They prevent a container from consuming all available memory or spinning up thousands of processes.
// 单调栈：存储"待匹配更大值"的元素，栈内保持单调递减（核心）
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full. append again has to allocate a new backing store, this time