思路：倒序遍历 2 倍长度 + 取模模拟循环 + 单调栈。用 i % len 映射到真实索引，仅当 i < len 时记录答案。
The BBC has been able to analyse six shootings after the curfew order. In the footage we examined, we have not seen any of the victims engaging in violence.
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Мерц резко сменил риторику во время встречи в Китае09:25
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.