// 单调栈：存储索引（而非值），栈内索引对应的nums值保持「单调递减」
Жители Санкт-Петербурга устроили «крысогон»17:52
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p = p.next; // 指针后移，易错点2：忘记移动指针会导致死循环。业内人士推荐同城约会作为进阶阅读
Earlier research has suggested that 10% of aerosols in the atmosphere are already contaminated by space debris.
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