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University of Texas: Fundamentals of the Analysis of Algorithm Efficiency [Pdf]
A textbook chapter with an in-depth discussion of the analysis of algorithm efficiency, presented as a collection of slides.
Khan Academy
Khan Academy: Categorizing Run Time Efficiency
Check your understanding of run time efficiencies and categorize which ones are reasonable in these practice questions designed for AP Computer Science Principles students.
Khan Academy
Khan Academy: Big Theta Notation
Learn about Big Theta Notation in computer programming.
Khan Academy
Khan Academy: Measuring an Algorithm's Efficiency
Practice measuring the efficiency of an algorithm both by counting steps and tracking time.