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That's it. Any other response is either a variation of these (like "resize the buffer," which is really just deferring the choice) or domain-specific logic that doesn't belong in a general streaming primitive. Web streams currently always choose Wait by default.
// 第一步：倒序遍历nums2，用单调栈计算每个元素的下一个更大值
This doesn't mean all maps must be brand new, just from the same batch/pre-calculation period.