Splet26. jul. 2024 · Yes, there are both deterministic and non-deterministic pushdown automata. Non-determistic pushdown automatons can recognize all context-free languages, while deterministic pushdown automatons con only recognize a proper subset of the context-free languages (these languages are called deterministic context-free languages). Share Cite … http://www.cs.bc.edu/~alvarez/Theory/PS7/ps7.sol.html
,X) (1,X, 0 1 - cs.usfca.edu
Splet13. nov. 2014 · The airplane has twice as many engines as it requires. I want to make a question the answer to which is: twice as many engines as it requires which specifically emphasizes twice as many. Not a yes/no question, but a wh/h question. I asked some native speakers of English and they provided me with sentences like: Splet1. I have to create a PDA that accepts strings with twice as many 0's as 1's. So far I have decided to create one which accepts via empty state: (q0, 0, Z0) - (q1, 0) (q0, 1, Z0) - (q1, … suppe squash brokkoli
What is the question for "twice as many ... as" format?
Splet01. feb. 2024 · 3 Answers Sorted by: 5 In short, take your grammar for the language having a greater or equal number of a 's in every prefix, but rename the startsymbol to P, i.e. P → a P ∣ a P b P ∣ ε. Then simply note that your condition requires a word to start with an a, hence the following will do the job: S → a P. SpletWe're counting a's on the stack. If we're counting b's, let's take the approach in which we push two b's every time we see one. Then, when we go to cancel a's, we can just pop one b for each a. If we see twice as many a's as b's, we'll end up with an empty stack. Now what if we're counting a's? We'll push one a for every one we see. When Splet20. nov. 2009 · 保密. 发表于 2009-7-23 22:30:00 显示全部楼层. A=2B=A is twice as many as B= there is twice as many A as B. 陈向东的黄书上的. suppertime jim reeves