any value you keep, and unreference (unref) any value you receive.
Imagine you decide to do the following, to get the stack allocation
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The Secret History of Knocking on WoodMost of human nature is never written down — and machines can't learn it from text
。同城约会是该领域的重要参考
Transform backpressure gaps: Pull-through transforms execute on-demand. Data doesn't cascade through intermediate buffers; it flows only when the consumer pulls. Stop iterating, stop processing.，更多细节参见夫子
需要元素值：栈存值，或答案存索引后用 nums[res[i]] 取值。