Algorithm算法代写代考

COMP 250 INTRODUCTION TO COMPUTER SCIENCE Week 9-1 : Induction Giulia Alberini, Fall 2020 WHAT ARE WE GOING TO DO IN THIS VIDEO? Inductive/Recursive definitions Inductive/Recursive proofs Mathematical Induction INDUCTION PROOFS For all 𝑛 ≥ 1, 1+2+3+ ….+ 𝑛−1 +𝑛= 𝑛 𝑛+1 2 How can we prove such a statement ? By “proof”, we mean […]

COMP 250 INTRODUCTION TO COMPUTER SCIENCE Week 9-3 : Recursion 2 (Binary Search) Giulia Alberini, Fall 2020 WHAT ARE WE GOING TO DO IN THIS VIDEO? More recursive algorithms  Decimal to Binary conversion Power function Binary Search RECALL: DECIMAL TO BINARY (ITERATIVE) ALGORITHM Constructing Base 2 Expansions procedure BinaryExpansion(𝑛) 𝑘≔0 While 𝑛 > 0

COMP 250 INTRODUCTION TO COMPUTER SCIENCE Week 12-1 : Binary Search Trees Giulia Alberini, Fall 2020 Slides adapted from Michael Langer’s WHAT ARE WE GOING TO DO IN THIS VIDEO? Binary Search Trees BINARY SEARCH TREES BSTNode  The keys are “comparable” e.g. numbers, strings. class BSTNode{ K key; BSTNode leftchild; BSTNode rightchild; : }

COMP 250 INTRODUCTION TO COMPUTER SCIENCE Week 10-2 : Recurrences Giulia Alberini, Fall 2020 WHAT ARE WE GOING TO DO IN THIS VIDEO?  Recurrences ALGORITHM ANALYSIS  We would like to find a function 𝑇(𝑛) that describes the running time of an algorithm given an input size 𝑛. It is relatively easy to determine

Real-World Protocols II CS 3IS3 Ryszard Janicki Department of Computing and Software, McMaster University, Hamilton, Ontario, Canada Acknowledgments: Material based on Information Security by Mark Stamp (Chapters 10.5-10.6) Ryszard Janicki Real-World Protocols II 1/21 Kerberos and Its Motivation In Greek mythology, Kerberos is 3-headed dog that guards entrance to Hades In security, Kerberos is an

Symmetric Key Cryptography CS 3IS3 Ryszard Janicki Department of Computing and Software, McMaster University, Hamilton, Ontario, Canada Acknowledgments: Material based on Information Security by Mark Stamp (Chapters 3.1–3.3) Ryszard Janicki Symmetric Key Cryptography 1/28 Symmetric Key Crypto Symmetric Key Cryptography 9  Stream cipher  generalize one-time pad o Except that key is relatively short