四步口诀：倒着来 → 弹 ≤ 当前的 → 栈顶即答案 → 当前入栈。
endpoint (and is validated while being output, including having extra。关于这个话题，Line官方版本下载提供了深入分析
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The big leadership story: Iran war raises energy prices and cyber threats, with taxpayers footing the bill.
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