Algorithm算法代写代考

CS21 Decidability and Tractability Lecture 15 February 7, 2024 • Post Correspondence Problem (skip) • Beyond RE and co-RE • Recursion Theorem Copyright By PowCoder代写 加微信 powcoder • On to complexity… February 7, 2024 CS21 Lecture 15 2 Post Correspondence Problem • many undecidable problems unrelated to TMs and automata • classic example: Post Correspondence

CS21 Decidability and Tractability Lecture 26 March 6, 2024 • Challenges to Extended Church-Turing – randomized computation – quantum computation Copyright By PowCoder代写 加微信 powcoder • Course review March 6, 2024 CS21 Lecture 26 2 Extended Church-Turing Thesis • the belief that TMs formalize our intuitive notion of an efficient algorithm is: • randomizedcomputationchallengesthisbelief March

CS 21 Decidability and Tractability Winter 2024 Posted: February 14 Solution Set 4 If you have not yet turned in the Problem Set, you should not consult these solutions. Copyright By PowCoder代写 加微信 powcoder 1. The high-level idea of the reduction is this: the first row of tiles should be forced to be the start

CS21 Decidability and Tractability Lecture 16 February 9, 2024 Complexity • Complexity Theory = study of what is computationally feasible (or tractable) with Copyright By PowCoder代写 加微信 powcoder limited resources: – running time – storage space – number of random bits – degree of parallelism – rounds of interaction – others… February 9, 2024 CS21

CS21 Decidability and Tractability Lecture 9 January 24, 2024 Deciding CFLs • Convert CFG into Chomsky Normal Form Copyright By PowCoder代写 加微信 powcoder • parse tree for string x generated by nonterminal A: January 24, 2024 IfA→k x (k>1)thentheremust be a way to split x: • A → BC is a production and •B→i yandC⇒j

CS21 Decidability and Tractability Lecture 25 March 4, 2024 • Challenges to Extended Church-Turing – randomized computation – quantum computation Copyright By PowCoder代写 加微信 powcoder March 4, 2024 CS21 Lecture 25 2 Extended Church-Turing Thesis • the belief that TMs formalize our intuitive notion of an efficient algorithm is: • randomizedcomputationchallengesthisbelief March 4, 2024 CS21

CS21 Decidability and Tractability Lecture 8 January 22, 2024 NPDA, CFG equivalence Theorem: a language L is recognized by a NPDA iff L is described by a CFG. Copyright By PowCoder代写 加微信 powcoder Must prove two directions: (⇒) L is recognized by a NPDA implies L is described by a CFG. (⇐) L is described

CS21 Decidability and Tractability Lecture 17 February 12, 2024 Euclid’s Algorithm Claim: value of x reduced by 1⁄2 at every execution of (2) except possibly first one. Copyright By PowCoder代写 加微信 powcoder • after (2) x < y • after (3) x > y • if x/2 ≥ y, then x mod y < y

CS 21 Decidability and Tractability Out: March 6 Winter 2024 Due: March 13, 1pm Copyright By PowCoder代写 加微信 powcoder This is the final exam. You may consult only the course notes and text (Sipser). You may not collaborate. There are 5 problems on two pages. Please attempt all problems. Please turn in your solutions via