Maths foundations
Discrete maths
Logic, sets, relations, counting, graphs and recurrences. Most of algorithms rests on this.
About 40 hours of study.
Where to learn it
Read
Mathematics for Computer Science (MIT 6.042J)
Eric Lehman, Tom Leighton, Albert Meyer
Parts II and III: Structures, Counting
The course text is a free PDF on the course page.
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Watch
Mathematics for Computer Science, video lectures (MIT 6.042J, Fall 2010)
Tom Leighton, Marten van Dijk
Lectures on number theory, graphs, counting and recurrences
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Discrete maths