// 易错点6：返回整个数组（如this.res）→ 不符合题目要求，题目要求返回单个数值
View a PDF of the paper titled Package Managers \`a la Carte: A Formal Model of Dependency Resolution, by Ryan Gibb and 4 other authors，详情可参考谷歌浏览器【最新下载地址】
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Enterprise-grade technology at a low cost for SMBs。关于这个话题，夫子提供了深入分析
Data flows left to right. Each stage reads input, does its work, writes output. There's no pipe reader to acquire, no controller lock to manage. If a downstream stage is slow, upstream stages naturally slow down as well. Backpressure is implicit in the model, not a separate mechanism to learn (or ignore).