Ask @WJMZBMR:

Could you please give me some resources and links you tried so I can get red on codeforces? I am studying from the internet and I'm learning too slow because of few materials I have :(

Umm...First there are some excellent books like introduction to Algorithms and Concrete math, you can refer to those books to learn the algorithms.
To become red on Codeforces, you need to practice more, solving problems from old contest from Codeforces and Topcoder is very good for master new ideas to solve problems :)

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