DarcyZhou
Android开发
Andorid Framework，音视频开发
获得徽章 0
- We have been using the term context-free without explaining why such rules a in fact "free of context". The simple reason is that the nonterminals appears by themselves to the left of the arrow in context-free rules. Thus, a rule A -> α says that A may be replaced by α anywhere, regardless of where the A occurs. On the other hand, we could informally define context as a pair of strings(of terminals and nonterminals) β, γ, such that a rule would apply only if β occurs before and γ occurs after the nonterminal. We would write this as βAγ -> βαγ. Such a rule in which α != ε is called a context-sensitive grammar rule. Context sensitive grammar rule are more powerful than context-free grammar rules but are also more difficult to use as the basis for a parser.展开12
- 昨天dy上刷到一个女健身博主：大智若钰 ，单手硬拉100kg，是的没错，单手硬拉！评论区瞬间炸锅。我没拉过，所以不知道这算什么水平。
这里我有个疑问，如果男生身高172，体重68kg，引体（自重+负重100kg）和双手硬拉100kg哪个难![[思考]](//lf-web-assets.juejin.cn/obj/juejin-web/xitu_juejin_web/img/jj_emoji_15.f58c082.png)
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