Agar is so critical that since WWII, scientists have tried to find alternatives in the event of a supply chain breakdown, especially as recent shortages have caused similar alarm. But while other colloid jellies have emerged, agar remains integral to laboratory protocols because no alternatives can yet compete on performance, cost, and ease of use.
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12:53, 27 февраля 2026Бывший СССР
💡 k: 数据范围, d: 最大位数, n: 数据量，这一点在爱思助手下载最新版本中也有详细论述
需要元素值：栈存值，或答案存索引后用 nums[res[i]] 取值。