Thelecturenotesandexercisesdrawheavilyonthecreativity,wisdom,andexperienceofthousandsof algorithms students, teachers, and researchers. In particular, I am immensely grateful to the almost 1400 Illinois students who have used these notes as a primary reference, offered useful (if sometimes painful) criticism, and suffered through some truly awful first drafts. I’m also grateful for the contributions and feedback from teaching assistants, all listed above.