适用场景：需要求「下一个更大/更小」「上一个更大/更小」、或「右侧第一个满足某条件的元素」时，可优先考虑单调栈。与堆不同，单调栈不负责全局最值，只处理「相邻关系」类的一维序列问题。
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If the talks fail, there is uncertainty over what the US may do regarding a possible military attack against Iran, and when it might act. Questions remain over what this could mean for the wider region, with Iran warning it would retaliate and even attack Israel.
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Researchers discover rare periods of a few thousands years when climate unexpectedly awoke from slumber