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Lecture 14

Lecture 14. Go over midterm results Algorithms Efficiency More on prime numbers. Solutions to Midterm Exam. Question 1 Question 2 Question 3 Question 4. Algorithms. An algorithm is a specified set of steps for solving a prescribed problem.

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Lecture 14

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  1. Lecture 14 • Go over midterm results • Algorithms • Efficiency • More on prime numbers

  2. Solutions to Midterm Exam • Question 1 • Question 2 • Question 3 • Question 4

  3. Algorithms • An algorithm is a specified set of steps for solving a prescribed problem. • It does not have to be written in any particular formal language, but it has to be intelligible to a reader and completely unambiguous. • It usually has input and always has output. • It must terminate in finite time, for all possible input.

  4. Implementation of an Algorithm • An implementation of an algorithm means a computer program written in a well defined programming language to carry out the steps of the algorithm.

  5. Problem: compute the first n prime numbers. • In question 1 you implemented a simple algorithm • Let’s discuss possible improvements to make it more efficient • In particular, do we need the loop in isPrime to run up to n?

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