定弹出条件：看题目要的是「第一个 / ≥ / < / ≤ cur」，对照上文的弹出条件对应法则决定弹谁。
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stack.pop(); // 弹出的索引对应的值≤当前身高，无遮挡，能看到。WPS下载最新地址是该领域的重要参考
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Those who follow Collins to space will learn just how much she achieved, not only as a woman, but as a formidable pilot and commander.