Backpressure is strict by default. When a buffer is full, writes reject rather than silently accumulating. You can configure alternative policies – block until space is available, drop oldest, drop newest – but you have to choose explicitly. No more silent memory growth.
: `Result: ${format(currentStep.value)}`
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// 核心Map：key=nums2的元素值，value=该元素在nums2中的「下一个更大值」
* 可根据需要替换上面的gap循环