Before agar, microbiologists had experimented with other foodstuffs as microbial media. They turned to substances rich in the starches, proteins, sugars, fats, and minerals that organisms need for growth, testing with broths, bread, potatoes, polenta, egg whites, coagulated blood serums, and gelatine. However, none worked particularly well: all were easily broken down by heat and microbial enzymes, and their surface, once colonized, became mushy and unsuitable for isolating microbes.
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// 计算天数：栈非空→栈顶索引-当前索引；栈空→0（易错点3：索引差别写反），更多细节参见同城约会
this.stack = []; // 核心：存储索引，保证索引对应的价格单调递减