Khan Academy: Expressing an Algorithm

Practice computer science problems expressing algorithms.

Check your understanding of expressing simple algorithms in flow charts, natural language, and pseudocode, in this set of free practice questions designed for AP Computer Science Principles students.

Practice measuring the efficiency of an algorithm both by counting steps and tracking time.

This Khan Academy resource is an article about a game that gives you an idea of how different algorithms for the same problem can have wildly different efficiencies. The computer is going to randomly select an integer from 1 to 15....

In this lesson, random sequences and pseudorandom number sequences are discussed. This video lesson from Khan Academy is intended for students who are taking an introductory computer science course.

This video lesson discusses how using random numbers can help speed up a decision algorithm in a computer program. This video lesson from Khan Academy is intended for students who are taking an introductory computer science course.

What is an algorithm? It's a sequence of steps that you follow to solve a problem. In everyday life, you might have an algorithm for hanging up your laundry, efficiently going through a shopping list, or finding an empty parking space in...

Learn the building blocks of algorithms in computer science.

Learn about two sorting algorithms: selection sort and insertion sort.

Learn the basics of algorithms in computer programming. [5:27]