需要索引（如算距离、下标）：栈存索引，用 nums[stack.at(-1)] 取值比较。
"My bum felt like it was boiling, I felt like I had a fever," she said.
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const FDictionaryPair* QueryParameters = nullptr;
There's also Stream.broadcast() for push-based multi-consumer scenarios. Both require you to think about what happens when consumers run at different speeds, because that's a real concern that shouldn't be hidden.
Synchronous fast paths matter